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WEB DEVELOPMENT

Lesson One: An Introduction to Windows Programming
By: Developer Shed
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    2004-05-30

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    by: cprogramming.com

    Lesson One: An Introduction to Windows Programming

    Written by RoD

    At this time we will take a look into the vast world of Windows programming. Since this tutorial is based entirely on programming done within the Windows environment, it will be required of you to have access to a Windows machine and compiler.

    For the programs we will be creating you will need a base understanding of the mechanics and structuring of the Windows operating system. Not to worry, however, because I am going to teach this to you!

    Microsoft Windows is a multi-tasking operating system that allows multiple applications, referred to here on out as processes. Every process in Windows is given a certain amount of time, called a time slice, where the application is given the right to control the system without being interrupted by the other processes. The runtime priority and the amount of time allocated to a process are determined by the scheduler.

    The scheduler is, simply put, the manager of this multi-tasking operating system, ensuring that each process is given the time and the priority it needs depending on the current state of the system.

    When it comes to game developers, you will find a large common interest in multithreading. Processes can be broken down into threads, where each thread can execute its own code to allow for multitasking within a single application. The scheduling for threads is the same as that for processes, except that threads are what make up the process.

    This means that within your games you can have multiple threads running that can perform multiple calculations at once and thus provide your game with multitasking within itself. To go a step farther we can do a quick explanation of fibers. In newer versions of Windows (Windows 98+) there is an even lower level execution object exists, called a fiber. Each thread in your process has the ability to house multiple fibers that can perform multiple operations at once, all in a single thread.

    Windows is what is known as an event-driven operating system. What this means is that each process is executed based on the events they receive from the operating system. For instance, an application may sit at idle and wait for the user to press a key. When that key is pressed Windows will register an event to the application that the key is down.

    Windows programming is difficult at all in most cases, and to start we'll use the most basic program ever created. Hello World is used in almost every class when you begin programming in any language, and that won't change here. So, shall we have a look at Hello World in Windows style? Sure!
    #include <windows.h>
    int APIENTRY WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR     lpCmdLine,
    int       nCmdShow)
    {
    MessageBox(NULL, "\tHello World!", "My first windows app", NULL);
    return 0;
    }
    
    As you can see, itŐs pretty straight forward. Don't pay attention to the things that don't make sense, as in the next lesson we will go in-depth to explain WinMain () and other functions, as well as show how this and OpenGL work together! You may contact me by as RoD, or at my email address, rod@cprogramming.com!

    As always, happy coding!
    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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