August 2024 - Wu_bp_2024s

Recordings Installment 12 (Wednesday, 20240821)
by Rony G. Flatscher 21 Aug '24

21 Aug '24

Hi there, here today's recording links: * 280_AutoJava_Environment_V04, Setup Environment for Java/OpenJDK (2023-01-19), NetRexx: <https://zoom.us/rec/share/TlbTW_lXh4Z-af6Rxan2pwYE3lunV46ABc2Uwn0jo9MJzu10N…> * 330_Paths_V03, About Storing Files: Where and How? Source directory, current directory, home directory, temporary directory …: <https://zoom.us/rec/share/TlbTW_lXh4Z-af6Rxan2pwYE3lunV46ABc2Uwn0jo9MJzu10N…> * 340_JSON_V06, JSON (JavaScript Object Notation) with json.cls (Introduced with ooRexx 5.0): <https://zoom.us/rec/share/TlbTW_lXh4Z-af6Rxan2pwYE3lunV46ABc2Uwn0jo9MJzu10N…> * 201608-net-clr, .NET for ooRexx (oorexx.net): <https://zoom.us/rec/share/TlbTW_lXh4Z-af6Rxan2pwYE3lunV46ABc2Uwn0jo9MJzu10N…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Recordings Installment 11 (Tuesday, 20240820)
by Rony G. Flatscher 20 Aug '24

20 Aug '24

Hi there, today there was a need to re-start the recording in the middle of an installment, hence chunks for the entire recording. here the recording links: * 260_AutoJava_RexxScript_V03, Hosted and Evaluated/Executed by Java (javax.script): <https://zoom.us/rec/share/GvJhFld8f0re66ZZf3zHhhIqzE-ee2feFDVl4Otkfg4ubK9oA…> * 270_AutoJava_JavaFX_V06, Creating Portable GUIs with JavaFX: o Part 1: <https://zoom.us/rec/share/GvJhFld8f0re66ZZf3zHhhIqzE-ee2feFDVl4Otkfg4ubK9oA…> o Part 2: <https://zoom.us/rec/share/ESFnX9lvNW2TZTM9RsL8b7mZ4_j_A7OO1ChYn4WLQORnGGG00…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Recordings Installment 10 (Monday, 20240819)
by Rony G. Flatscher 19 Aug '24

19 Aug '24

Hi there, here the link of today's recording: * 250_AutoJava_XML_SAX_V02, Parsing XML Documents with SAX (Simple API for XML): <https://zoom.us/rec/share/-_1z-Tu9Iwqgh7v1L1ouOTQUUsAxDNREriQ8mTREnm7MiH7JI…> * 252_AutoJava_XML_DOM_V07 o Part 1, Parse, Analyze and Process XML Documents with DOM (Document Object Model): <https://zoom.us/rec/share/-_1z-Tu9Iwqgh7v1L1ouOTQUUsAxDNREriQ8mTREnm7MiH7JI…> o Part 2, XSLT (Extensible Stylehsheet Language Transformation): <https://zoom.us/rec/share/-_1z-Tu9Iwqgh7v1L1ouOTQUUsAxDNREriQ8mTREnm7MiH7JI…> * 254_AutoJava_jsoup_V06, Parse, Analyze and Process HTML Documents with jsoup (a Java DOM Parser): <https://zoom.us/rec/share/-_1z-Tu9Iwqgh7v1L1ouOTQUUsAxDNREriQ8mTREnm7MiH7JI…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Meeting Summary for WU - Learn Programming from Zero in Only Three Weeks, Aug 16, 2024 08:59 AM Vienna ID: 919 2506 6620
by Rony G. Flatscher 16 Aug '24

16 Aug '24

Quick recap Rony led a comprehensive discussion on the history, functionality, and compatibility of Open Office and LibreOffice, including their development, data types, interface classes, and programming possibilities. He also provided a detailed walkthrough on various features such as accessing documentation, understanding the 'load component from URL' method, using the spreadsheet module, and manipulating drawing module data. Lastly, he shared his experiences and solutions regarding the Open Office library, introduced the Uno Runtime Environment, and encouraged the team to review sample programs for better understanding. Next steps Peter to install 64-bit LibreOffice on his Windows machine. All attendees to review the nutshell examples in the BSF for ooRexx samples directory (subdirectories "ahammer" and "bulga"). All attendees to run the nutshell examples in sequence and study their source code to gain familiarity with OpenOffice/LibreOffice programming. All attendees to practice using the online OpenOffice/LibreOffice API documentation. All attendees to experiment with creating and manipulating word processor documents using the demonstrated techniques. All attendees to practice creating and formatting spreadsheets using the shown examples. All attendees to try creating business graphics in spreadsheets using the provided code. All attendees to explore the drawing module capabilities using the given example. All attendees to experiment with creating presentations and adding bullet points using the demonstrated methods. All attendees to investigate the spell-checking capabilities of the UNO runtime environment outside of the GUI. Rony to send this week's meeting summaries to the attendees. Summary History and Functionality of Open Office and Libra Office Software Packages Rony led a comprehensive discussion about the history and functionality of the Open Office and Libra office software packages. He explained the origins of Libra Office, its acquisition by Sun, and subsequent transformation under Oracle, emphasizing the importance of Java in its development. Rony also highlighted the compatibility between OpenOffice and LibreOffice, and their common goal of Microsoft Office compatibility. Additionally, he shared his experience with using Zoom's summary feature and advised Peter, who uses Microsoft Office, to install the 64-bit Libra Office for a better experience. UNO Model and Open Office Architecture Rony discussed the advantages and functionality of the Universal Network Object (UNO) model developed by the Germans, highlighting its efficiency and the use of a text file format for class definitions. He also explained the modular structure of Open Office and Libre Office, emphasizing the reuse of tested codes and the role of service classes and managers. Rony further elaborated on the naming conventions for classes and interfaces, the compatibility of various programming languages, and the importance of using the query interface to access methods from interface classes. C++, Java, and Uno Programming Overview Rony provided an in-depth overview of the basic data types in C++ and Java, and their significance in understanding and navigating code, particularly in relation to Open Office and LibreOffice. He also discussed the various classes in the Uno programming language, the concept of Uno modules, and the importance of the Uno Singleton class. Rony further highlighted the extensive class library for OpenOffice and LibreOffice, and the resources available on the Open Office Libra Office website, including Java classes for interaction. Lastly, he detailed the installation and support process for OpenOffice and LibreOffice, and shared a link to a well-received student utility related to open office and business programming settings. Interface Classes and Programming Possibilities Rony discussed the interface classes within a system, highlighting the importance of documentation and natural examples for understanding the functionality of the 1,422 interface classes out of 2,694. He demonstrated the process of querying an interface in Java, using the Uno class dispatch helper, and suggested ways to simplify the service object. Rony also discussed programming possibilities with Open Office and Libra Office, including the use of a module called 'uno dot cls' and the creation of a 'X desktop' object. He further explained the system's capability to load and save documents from various sources and its potential for interaction and change. Technical Issue and Recording Session Rony and Reggie discussed a technical issue related to displaying documents. Rony explained the use of underscore blank to indicate a new window should be opened for the document. Reggie confirmed his understanding of this. Rony also mentioned that he would be away for 10 minutes and would return at 11 local Vienna time. Upon returning, Rony initiated a new recording session. Open Office Libra Documentation and Functionality Rony provided a detailed walkthrough on how to access and understand the documentation for the 'load component from URL' method in Open Office Libra. He also explained the functionalities of the Open Office Libre Office web processor module, including its three services and the use of the X text document interface. Rony demonstrated how to create and modify a document, use cursors for text changes, and adjust paragraphs using different styles. Reggie confirmed the availability of the required information on the internet. Adjusting Paragraphs and Zoom Troubleshooting Rony experienced technical difficulties with his Zoom session due to his machine being overloaded with software. After resolving the issue, he led a discussion on adjusting paragraphs in a word processor, using the Open Office application as an example. The team also discussed the potential need for a system reboot to stabilize resources. The session concluded with a demonstration of adjusting paragraphs, and a brief break was taken before the next meeting. OpenOffice Spreadsheet Module Tutorial Rony led a tutorial on the spreadsheet module in OpenOffice, focusing on its various functionalities and how to interact with it. He explained the concept of tables, the use of the Excel range interface, and how to address cells using different schemes. Rony also demonstrated the creation of a spreadsheet, inserting charts and drawings, and changing the height of a line. He emphasized the importance of using the correct file URI format when storing documents and warned against forgetting passwords. Reggie and Peter were present and contributed to the discussion. Spreadsheet Data Manipulation and Graphics Rony demonstrated how to use the X Column Row Range interface to manipulate spreadsheet data, including how to access and modify cell heights and widths. He emphasized the importance of using the integer wrapper class for effective row and column updates. Rony also showed how to use the 'Unota set cell' routine from the 'Uno dot cls' file in Rex to manipulate a spreadsheet, set cell values, format text, and change font weights. Additionally, he explained the process of creating business graphics from data using a natural example, and the challenges he faced in understanding and utilizing the number format system in Open Office LibreOffice. OpenOffice LibreOffice Drawing Module Overview Rony presented an in-depth overview of the drawing module available in OpenOffice LibreOffice, demonstrating its usage in creating document collections of draw pages and its reapplication in the presentation module, S. Impress. He emphasized the importance of using the service manager to create instances for the drawings and showed how to set the string value for a rectangle shape and insert a carriage return character for proper line breaks. Rony also discussed the process of creating a presentation with two slides using the 'As Impress' document type, detailing the process of accessing and setting properties of the layout and shapes, and how to insert new pages into the collection. He concluded by mentioning an issue with the formatting of a slide, noting that it was missing the bullets. Open Office Library Experiences and Solutions Rony shared his experiences and solutions regarding the Open Office library, including the challenges he faced and how he was aided by a chance encounter with a professional Open Office developer, Christophe. He explained various functionalities such as using the 'add item' function, a utility routine for debugging, and how to enumerate objects in Open Office. Rony also introduced the Uno Runtime Environment (URE) and demonstrated its use, including accessing the spell checker service through the lingo service manager. He encouraged the team to review the sample programs in the Examples directory for better understanding. Reggie sought guidance on finding these samples, which Rony provided. /AI-generated content may be inaccurate or misleading. Always check for accuracy. / -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Meeting Summary for WU - Learn Programming from Zero in Only Three Weeks, Aug 14, 2024 09:02 AM Vienna ID: 919 2506 6620
by Rony G. Flatscher 16 Aug '24

16 Aug '24

Quick recap Rony discussed the use of Java for creating graphical user interfaces and the challenges faced in developing GUI classes that work across all operating systems. He also provided a comprehensive introduction to Java programming, demonstrated the implementation of Rexx event handling in Java, and discussed the functionalities of the Java socket class in client-server programming. Lastly, he highlighted the importance of data encryption for secure data transport and encouraged further study of Java socket programming. Next steps Participants to review Java socket programming concepts covered in the session. Participants to study the Java documentation for socket and SSL/TLS classes. Participants to practice transcribing Java socket programming examples to Object REXX. Participants to experiment with creating simple client-server programs using sockets in Object REXX. Participants to explore using SSL/TLS for secure socket communication in their programs. Participants to write and submit two small example programs based on the session content. Participants to review the Echo Server and Echo Client examples provided. Participants to practice using the keytool utility to generate certificates for SSL/TLS. Participants to explore wrapping Java streams into readers/writers for character-based communication. Participants to experiment with buffered readers/writers in their socket programs. Participants to review the differences between server and client property names for SSL/TLS setup. Participants to practice error handling in socket programs using signal on syntax. Participants to explore Java tutorials on socket programming for further learning. Participants to prepare questions on socket programming for the next session. Rony to prepare materials for the next session on Friday. Summary Java GUI Development and Challenges Rony discussed the use of Java for creating graphical user interfaces (GUIs), highlighting its benefits such as operating system independence. He detailed the challenges Java programmers faced in developing GUI classes that could work across all operating systems and how they overcame these hurdles. Rony also explained the technical aspects of GUIs, including the representation of pixels, the increase in screen resolution over time, and the role of specialized graphical processors in modern personal computers. Java GUI Classes and Programming Rony provided an in-depth explanation of Java's GUI classes and their components, emphasizing the importance of understanding their functionalities and hierarchical structure. He discussed the evolution of these classes, from the original Greek classes to the introduction of Swing, and highlighted the benefits and drawbacks of each generation. Rony also touched on the concept of events in Java GUI components, the use of event listeners, and the challenges of maintaining the positions of GUI components during window resizing. Lastly, he demonstrated a simple Java program using GUI components and compared it to a similar program in Recs, aiming to show that such programs could be created without extensive Java programming skills. Java Programming Introduction and Challenges Rony provided a comprehensive introduction to Java programming, covering topics such as the import statement, class definition, and the main method. He also explained the concept of a GUI and demonstrated the creation of a simple GUI frame. Rony further discussed the origin and symbolism of the Java programming language and demonstrated how to compile and run a simple Java program. He also identified an issue with the program's closure, which remained an open question for the team. Java Event Handling and GUI Programming Rony explained the concept of event handling in Java, emphasizing the importance of implementing all event methods and the use of event adapter classes to save coding time. He also discussed the principles of GUI programming in Java, including the creation and handling of events, and the role of the AWT thread in maintaining the GUI. A problem with the current Rex program that uses the Java GUI system was identified, where the GUI shuts down immediately when the program ends. Rony proposed a solution to synchronize the main Rex program with the state of the GUI and stressed the importance of understanding the problem before implementing the solution. Rexx Event Handling and Java GUI Implementation Rony discussed the implementation of Rexx event handling in Java and the creation of a simple GUI using Java's Abstract Window Toolkit (AWT) classes. He emphasized the importance of defining proper orex classes for event handling, using adapter classes to handle multiple event methods efficiently, and the consideration of selecting appropriate AWT classes and identifying events of interest. Rony also demonstrated the compiled program and its reactions to user input, and highlighted the necessity of defining Rec classes for each use and the need to synchronize the main Rex program with the GUI part. He further discussed the implementation of various Rex classes in a Java program, the functionality of the Regs class, and its methods. Rexx Programs and Java Integration Rony discussed the functionality and benefits of a program that runs unchanged on various operating systems, including Windows, Apple, and Linux. He emphasized that the program, written in Rexx, does not require knowledge of Java syntax and can be used to implement Java methods. Rony also highlighted that the program's GUI behaves like a Java solution and that it's possible to create Rexx objects that implement Java interface classes. He provided some helpful links for further technical details and encouraged the attendees to explore the GUI examples. Socket Programming and IP Addresses Rony explained the fundamental concept of socket programming, using the analogy of a switchboard to illustrate how programs communicate with each other. He detailed the function of TCP/IP sockets as a switchboard with 65,536 ports, each numbered from 0 to 65,535, and highlighted the significance of each computer having a unique IP address. Rony also introduced IP version 6 addresses, which offer a much larger number range than IP version 4 addresses due to their 128-bit values. Java Sockets and Domain Names Discussion Rony discussed the use of Java for client-server programming via sockets, focusing on the concepts of Internet addresses and domain names. He explained the limitations of Internet addresses and introduced the name service program that allows computers to be identified using human-memorable names. Rony also delved into the development of domain names, their commercialization, and their role in locating computers. He demonstrated a Java program, 'Gethostinfo', which uses the Java class to fetch an Internet address based on user input and emphasized the importance of the 'try-catch' block for handling exceptions. Lastly, he introduced the 'java.net.Socket' class for connecting to a computer via the Internet, requiring the IP address, host name, and port number. Java Socket Class and Client-Server Programs Rony explained the functionalities of the Java socket class and its role in establishing connections between computers. He detailed the processes involved in creating a client-server program, emphasizing the importance of clear communication protocols and the use of port numbers. Rony also demonstrated the implementation of a simple server and client program using Java and Rexx, illustrating how data is exchanged using byte arrays and specific Java classes. The program was run live to show its efficiency. Java Socket Server and Rex Client Communication Rony demonstrated the communication capabilities between a Java socket server and a Rex client, confirming that they could function independently of each other's programming language. He emphasized the importance of data encryption to prevent eavesdropping, explaining that the standard solution is to use the Transport Layer Security (TLS) protocol. Rony also highlighted that Java offers built-in TLS support, which is not available in Rex. He advised the team to be aware of potential security risks when using socket connections and to consider the implementation of TLS for secure data transport. Secure Encryption Infrastructure With Java Rony discussed the implementation of a secure encryption infrastructure using Java's factory classes, emphasizing the importance of using long-term support versions of Java for security updates. He demonstrated how to set up system properties in Java to provide the certificate file's location to the Java program, and how to use SSL/TLS in a secure manner. Rony also explained the use of Java utility classes to wrap up streams into readers and writers, and to buffer data for exchange between sockets. He concluded by encouraging further study of Java socket programming and the available documentation, and reminded participants to submit their small examples via email. /AI-generated content may be inaccurate or misleading. Always check for accuracy. / -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Meeting Summary for WU - Learn Programming from Zero in Only Three Weeks, Aug 13, 2024 09:01 AM Vienna ID: 919 2506 6620
by Rony G. Flatscher 16 Aug '24

16 Aug '24

Quick recap Rony led a comprehensive discussion on the Java programming language, its cross-platform compatibility, and the role of the Java Virtual Machine in compiling byte code. He also introduced new short programs to assist students with Java and provided an in-depth overview of the Bean Scripting Framework (BSF) for Oracle. Additionally, he demonstrated the use of the Bsf.Cls package for interacting with Java classes and objects, and discussed the implementation of Rex command handlers in Java through a project called J. Dot Java, 2D. Next steps All attendees to run the Bsf for ORex samples that start with number 1 (42 samples in total). All attendees to create 2 very short samples based on existing ones, with modifications, to practice using Bsf for ORex. All attendees to review the Bsf for ORex documentation in the information folder. Peter to use Java 8 for .NET (CLR) samples. All attendees to avoid trying to understand GUI samples until after tomorrow's session. All attendees to explore the Jdor (Java 2D for ORex) examples and documentation. All attendees to review the Bsf.Dialog class usage in samples. All attendees to familiarize themselves with the Bsf.Clipboard class functionality. All attendees to study the Java collection iteration examples using ORex constructs. Rony to provide an email response to Peter's question about .NET. Summary Java Programming and Bean Scripting Framework Rony led a discussion about the current course status, which had reduced to five participants due to absences. He introduced two new short programs to assist students with Java and outlined the course's topic for the day: the Bean Scripting Framework (BSF) for Oracle, a Java framework enabling the integration of programming languages with Java. Rony explained the fundamental concepts of Java programming language, emphasizing its cross-platform compatibility and the Java virtual machine's role in compiling byte code into machine language for faster execution. He also highlighted the extensive libraries and applications available in Java, making it a valuable tool for programmers. Rony's PSF and BSF Packages Update Rony discussed the Psf, an external Rex function package he developed 25 years ago for interacting with the Java runtime environment. He highlighted recent additions to the package, including Bsf dot icon V for simplifying Rex programmers' code page translation and Psf dot clipboard for streamlining text and image copy-paste processes. Rony also introduced an external Regs function package, Bsf.cls, which facilitates the use of Java classes and objects in Rex programming. He demonstrated how to use Bsf.cls by creating an instance of a Java class and sending it messages. Java JDK, LTS Versions, and Evolution Rony clarified the differences between Java Runtime Environment (JRE) and Java Development Kit (JDK), emphasizing that JDK includes the compiler and tools for application creation. He highlighted the importance of installing the Java Jdk 8 Lts and Java Jdk 21 Lts for long-term support and versioning of Java. Rony also discussed the evolution of Java from a proprietary to an open-source language and its adoption by major tech companies. Reggie showed understanding and interest in further technical discussions about Java. Java Programming Language Overview Rony provided a comprehensive overview of the Java programming language. He explained the differences between dynamic and static programming languages, with Java being an example of the latter. He detailed the concept of 'wrapper classes' and the process of 'boxing' and 'unboxing', as well as the structure of a Java class, including fields, methods, and annotations. Rony also discussed the accessibility and visibility of Java classes, fields, and methods, and encouraged the use of the Java API documentation, which is automatically generated using Javadoc. He highlighted the availability of comprehensive documentation for the Java runtime environment, including improved search functionality in newer versions. Java Class XYZ and BSF Functionality Rony provided an in-depth explanation of the Java class XYZ, which is a public subclass of Java's Object class with a static counter field and two constructors. He emphasized the importance of Java's strict typing and how private fields can only be accessed through provided get and set methods. Rony also demonstrated the functionality of the Bsf class, which serves as a proxy for Java classes and is used to create instances and send messages. He further discussed the process of writing a Rex program using Bsf, the causes and solutions of errors, such as the 'XYZType' not found error, and how to compile a Java class and generate JavaDocs. Java Class Clarification and Rejoining Rony led a discussion that included a break and a subsequent rejoining. Reggie had questions about the Java class "XyzType", which Rony clarified. After resolving Reggie's queries, the team proceeded with the meeting. Rony Demonstrates Java-Rex Integration Rony demonstrated how to use the Bsf.Cls package's public routine, Bsf.Import, to import a Java class into Rex, and showed an alternative approach using the Psf.Proxy class. He also explained the functionality of getters and setters in Java, and how they can be used to manipulate attributes as if they were Regs attributes. Rony highlighted the differences between Java and Rex, focusing on issues related to case sensitivity, array handling, and type strictness. He introduced the Psf.cls package that allows the creation of Java arrays using Rex syntax, thereby simplifying the interaction with Java arrays. Reggie confirmed his understanding of the concepts discussed. External Rexx Function 'BSFCreateRexxProxy Rony explained the functionality of the external Rexx function 'BSFCreateRexxProxy' which creates a Java object that can contain a Rexx object. This allows the Java program to send messages to the contained Rexx object, and vice versa. Rony further elaborated that all arguments applied to the Java method are forwarded as an Orex message to the Rex proxy contained Rex object. He also mentioned an optional second argument that can be supplied at the time of Rex proxy creation, which can be useful in certain situations. Java Interface Classes and Rex Proxy Variants Rony explained the use of Java Interface classes, emphasizing that they define properties, fields, and methods without implementing them, and any Java class can claim to implement such an interface. He discussed a variant of Bsf create Rexproxy that uses Rex objects, packs them into a Java Rex proxy, and claims to implement all methods of a specified Java interface class. Rony also explained the creation and usage of Rex proxy variants in the context of a program that interacts with both Rex and Java. He demonstrated how to use these variants to distinguish whether a method was invoked from a message sent to the Rex object directly or from Java, and how to supply user data values to the Rex proxy. Java or Rex Bridge and BSF Overview Rony discussed the functionalities and benefits of the Java or Rex Bridge, emphasizing its complete implementation and the opportunities it presents for exploiting Java features. He then introduced the Bsf, an external Regs function package, and its capabilities, including the ability to interact with Java classes and objects. Rony also touched on potential issues that may arise, such as problems with case or type, and explained the infrastructure implemented to handle these issues. He encouraged the team to familiarize themselves with these concepts and to use the available resources to their advantage. Addressing Java Method Selection Issues Rony discussed the issues that can arise when using Java's method selection in conjunction with primitive types. He explained that if there are multiple methods with the same name but different argument types, it can lead to the wrong method being selected. To solve this, Rony suggested using the 'box' and 'unbox' routines from the Bsf.cls library to create a Java object that forces the selection of the method with the compatible signature. He also highlighted the importance of correctly specifying the type and case of arguments when using the 'invoke strict' method. Psf. Forex Tutorial and Resources Overview Rony led a tutorial on the installation and usage of Psf. Forex, emphasizing the importance of starting with simpler samples before moving on to more complex ones. He also demonstrated how to access the Bsf. 4 or x 8 50 program and view and run Rex code using the Bsf. For Regs menu's GUI. Rony highlighted the various features and resources available in the Bsf or Regs package, including an information folder with articles, reference cards, and other useful resources, as well as the Samples directory containing numerous examples for different purposes. He advised that the code for these examples be studied after understanding the concepts behind them. Rex Handlers and Java 2D Graphics Rony discussed the implementation of Rex command handlers in Java through a project called J. Dot Java, 2D. He demonstrated the use of these handlers for creating bitmaps and images, and highlighted their potential for game development. Rony also discussed the creation of a list of fonts implemented on different operating systems, emphasizing the simplicity of the task when using Java. Furthermore, he provided a detailed walkthrough of various programming concepts, focusing on image manipulation, 2D graphics, and collection iterations. As homework, Rony assigned the task of exploring the provided samples and creating two new ones. /AI-generated content may be inaccurate or misleading. Always check for accuracy. / -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Meeting Summary for WU - Learn Programming from Zero in Only Three Weeks, Aug 12, 2024 08:57 AM Vienna
by Rony G. Flatscher 16 Aug '24

16 Aug '24

Quick recap The team discussed various projects, with Giorgia.Rosini presenting her ideas and Reggie presenting a three-part project on creating mailing labels. Rony led a detailed discussion on the history, applications, and syntax of Visual Basic and Rexx, as well as the use of the trace keyword, function, and environment symbols. The team also addressed issues related to code pages, character encodings, and the installation of Bsf for all Rex, with Rony providing guidance for troubleshooting and installation. Next steps Georgia to send the 2 programs she demonstrated with a short description and Rex code to the email list. Charlotte and Reggie to communicate and come up with 3 small project ideas using 2 Windows programs controlled by a Rex program. Charlotte and Reggie to try to demonstrate one of their project ideas in the next session if possible. Prisca to check in with Rhoda on her status and catch up on missed content. Peter to potentially work on a project to sort his movie directory and cast files to his TV. All participants to complete 2 small homework examples based on the day's content (trace, environment symbols, or BSF features if installed). Reggie to complete installation of BSF for ORex following Rony's instructions. All participants to review the code pages and Unicode content, especially if working with non-English text. All participants to be aware there is no class on Thursday due to a public holiday. All participants to prepare for the next session focusing on Java integration with ORex. Summary Giorgia.Rosini's Projects and Team Experiences Rony welcomed the team, including newcomer Reggie, and informed that Milos was unable to attend due to illness. The main discussion revolved around three projects that Giorgia.Rosini and Milos had been working on. Giorgia. Rosini presented her ideas to the team, which included creating inspirational messages, utilizing data from a website to create an Excel chart and a pop-up document, and connecting her email account and Outlook calendar to avoid missing appointments. Rony appreciated Giorgia.Rosini's initiative and creativity, and Giorgia.Rosini agreed to send Rony the programs and a description of what they do, along with the code, at a later date. The team also discussed their experiences with the previous week's content, with Peter expressing his satisfaction with the team's output. Project Discussion and Visual Basic Transcription Peter informed Rony that Kim's attendance was uncertain due to illness and caring for a new puppy. Reggie then presented a three-part project aimed at creating mailing labels, which involved creating a CSV file from the MS Outlook contact items, importing the CSV file into MS Access to create a contacts database, and extracting the contact items from the database to print out the address labels. Rony emphasized the value of Reggie's approach to breaking down the problem into three parts and combining them with piping. Rony also suggested the use of a certain class that could help read CSV files, which Reggie acknowledged and agreed to use. They discussed the reliance on internet research for programming solutions, with Rony expressing caution about the reliability of AI-supported systems. Rony encouraged Reggie to share his solutions online for others to benefit from, provided he encountered no issues. Rony led a discussion on the potential of transcribing Visual Basic code to Object Rexx (OoRexx), given the vast amount of Visual Basic solutions available online. He emphasized the importance of understanding Visual Basic code and its benefits, such as facilitating debugging and code page translation. Visual Basic History and Applications Rony discussed the history and applications of Microsoft's Visual Basic programming language. He explained that Visual Basic was initially developed for the IBM PC and later became popular due to its use in Microsoft Office applications. Rony also clarified the differences between various versions of Visual Basic, including Visual Basic Script, Visual Basic for Applications, and Visual Basic .NET. He further discussed the compatibility issues between these versions and warned against using incompatible versions. Lastly, he touched on the development of an open-source .NET implementation called Mono and its limitations compared to the Microsoft .NET. Visual Basic and Rexx Syntax Comparison Rony discussed the syntax and usage of Visual Basic and Rexx, highlighting their similarities and differences. He explained the use of message operators, string concatenation, and the differences in variable definitions. He also discussed the complexities of function invocation in Visual Basic and the creation of Visual Basic macro code in applications like Excel, Word, or Outlook. Lastly, he touched on the 'with' statement in Visual Basic, its potential for errors, and the benefits of translating between the two languages. Rony's Presentation and Slide Sharing Rony led a break before resuming the meeting. Reggie confirmed receiving the slides from Georgia via chat. Rony then uploaded additional slides about the environment and requested all participants to keep their cameras on. The meeting continued with Rony sharing his screen for the discussion. Exploring Trace Keyword and Function Rony discussed the use of the trace keyword and function in the Rex programming language, emphasizing its utility in understanding code execution and identifying errors. He also demonstrated the use of the built-in random function in Python, illustrating how it can generate different program outputs. Furthermore, he introduced the trace function, which provides detailed information about the program's execution, and explained how to use it effectively, including how to turn on and off intermediate tracing and how to reset it. He underscored the importance of the trace function in understanding the results of a program. Orx Runtime Environment and Symbol Resolution Rony provided a detailed explanation of the Orx runtime environment and its symbol resolution system. He discussed the role of the interpreter in managing the state of every program package, the use of environment symbols to access entries in the environment directories, and how these symbols can be used to check object existence and retrieve values. Rony also explained the Regs system, which resolves environment symbols by looking for values in various directories, and emphasized the importance of following a specific naming convention to avoid symbol conflicts. He concluded by demonstrating how to use environment symbols to store and retrieve values. Data Storage Protocol and Code Pages Rony and Peter discussed the recommended protocol for data storage in Rex programs. Rony advised Peter to use the local package directory for sharing data among different routines in the same program and the environment for global data sharing across different interpreters. Rony then shifted the discussion towards the historical background and current usage of code pages, explaining the concept of the 7-bit ASCII code page and its limitations in representing non-English characters. He also detailed the shift to 8-bit code pages in the PC world and its inability to fully represent all the world's languages and characters. 8-Bit Code Page Issues and Solutions Rony discussed the issues related to the variation of 8-bit code pages used in the DOS and Windows worlds. He explained the potential problems that arise when text, encoded with one code page, is read using a different one, leading to distorted and incorrect display of characters. Rony emphasized the importance of understanding and correctly using the appropriate code page when working with text, particularly in the context of the Unicode standard and its various encodings. He also demonstrated the Rex program that showcases these issues and how to change the active codepage using the 'chcp' command in a terminal window. Rony Demonstrates Rex Program for Encoding Issues Rony demonstrated a Rex program that highlighted the issue of code page problems in Microsoft Word, specifically the incorrect display of characters due to incorrect encoding. He emphasized the importance of correct encoding and introduced the Bsf.iconv() function for converting between code pages. Rony also showed how to use the Bsf.Clipboard class from the Bsf.Tls package to automate conversion and copy strings into the system clipboard. He clarified the UTF-8 encoding for certain characters, such as the Smiley and Frowny, and confirmed that a Unicode UTF-8 encoded string containing both a Smiley and Frowny was discussed. Code Pages, Encodings, and Reflections Rony discussed the importance of understanding code pages and character encodings, particularly UTF-8, and the benefits of using the Java bridge for text handling. He also addressed Peter's question about the Windows clipboard class's limitations and suggested using his Bsf dot clipboard class as a solution. Rony clarified the public holiday schedule and encouraged participants to master the new concepts presented. Additionally, Rony and Peter had a discussion about recent terrorist attacks, the ongoing refugee crisis, and the complexities of the Israeli-Palestinian conflict. Troubleshooting BSF Installation for Rex Reggie had trouble installing Bsf for all Rex, but was successfully guided through troubleshooting steps by Rony. The process involved unblocking the installation package, deleting the uncit directory, and manually removing the directory with all its subdirectories. Rony also provided instructions on how to access and install the Bsforex Zip Archive, including unblocking and unzipping the archive, and navigating to the Bsf or Regs directory. Rony warned Reggie that the installation process would alter the environment variable path and advised him to open a new terminal window for the changes to take effect. If Reggie encountered any issues, he was to email Rony for further assistance. /AI-generated content may be inaccurate or misleading. Always check for accuracy. / -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Recordings Installment 9 (Friday, 20240816)
by Rony G. Flatscher 16 Aug '24

16 Aug '24

Hi there, here the link of today's recording: * 240_AutoJava_AOO_LO_V04, Scripting Apache OpenOffice (AOO) and LibreOffice (LO) using Universal Network Objects (UNO): o Part 1 (ending at Windows problem): <https://zoom.us/rec/share/IX9kS4a1mcCgmsHje4s9-0rguJC3JemeGT086KCTI0Y243Y52…> o Part 2 (continuing from the above Windows problem): <https://zoom.us/rec/share/IX9kS4a1mcCgmsHje4s9-0rguJC3JemeGT086KCTI0Y243Y52…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Recordings Installment 8 (Wednesday, 20240814)
by Rony G. Flatscher 14 Aug '24

14 Aug '24

Hi there, here the link of today's recording: * 220_AutoJava_gui, Portable GUIs for ooRexx Using BSF4ooRexx: <https://zoom.us/rec/share/T0mUQt1gsVQN8A2Rhz1ZlOxK4a0HqH4kUPldg-2jzJOGiFTFw…> * 230_AutoJava_Sockets, Sockets ("java.net", "javax.net"), SSL/TLS ("javax.net.ssl"): <https://zoom.us/rec/share/T0mUQt1gsVQN8A2Rhz1ZlOxK4a0HqH4kUPldg-2jzJOGiFTFw…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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Recordings Installment 7 (Monday, 20240813)
by Rony G. Flatscher 13 Aug '24

13 Aug '24

Hi there, here the link of today's recording: * 210_AutoJava_BSF4ooRexx, "BSF4ooRexx - The Bean Scripting Framework for ooRexx": <https://zoom.us/rec/share/hUuXHnzkmIPTvA7r20ry0v3oLwpG0b594_s834iT4AAyw0NtG…> Cheers ---rony -- -- __________________________________________________________________________________ Prof. Dr. Rony G. Flatscher Department Wirtschaftsinformatik und Operations Management Institut für Wirtschaftsinformatik und Gesellschaft D2c 2.086 WU Wien Welthandelsplatz 1 A-1020 Wien/Vienna, Austria/Europe http://www.wu.ac.at __________________________________________________________________________________

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2024

Wu_bp_2024s August 2024

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