The WinMain procedure More Windows Programming background.
Tutorial Details:
The WinMain procedure
Every Windows programming needs a main entry point. That being said, you may be wondering what this entry point is. The main entry point for any Windows program is called WinMain. The function prototype for WinMain is a little confusing at first, but as we continue to work with it you'll notice it becomes much easier to understand. Well. we've told you what it is; now were going to show you! Here's the prototype for WinMain:
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd);
As you may have already noticed, the return type for WinMain is, and always will be, int. All 32-bit Windows operating system uses the calling convention WINAPI. This calling convention MUST be used to distinguish the function as the entry point. Now for the parameters. As you can see, WinMain uses four parameters when the program starts. Lets have a look at them, shall we?
hInstance - is a handle to your applications instance, where an instance
can be considered to be a single run of your application. The instance
is used by windows as a reference to your application for event handling,
message processing, and various other duties.
hPrevInstance - is always NULL.
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