C++ Windows Programming

The WinMain function

In the Win32 API, WinMain is the function equivalent to main. Each application must include the definition of the WinMain function. In order for Small Windows to work, WinMain is implemented as a part of Small Windows, while MainWindow has to be implemented by the user of Small Windows for each project. To sum it up, here are the three kinds of main functions:

Regular C/C++	Win32 API	Small Windows
main	WinMain	MainWindow

The WinMain function is called by the Windows system and takes the following parameters:

• instanceHandle: This holds the handle of the application
• prevInstanceHandle: This is present due to backward compatibility but is always null
• commandLine: This is a null-terminated character (char, not TCHAR) array holding ...