m_pMainWnd is the public member of CWinThread. This is mainly used when dealing with a UI thread and there is a top level main window. Every MFC application should have a main application thread. This main thread is implemented by CWinApp which is derived from CWinThread. Every application should create a main overlapped window and assign this main window pointer to m_pMainWnd. m_pMainWnd is the member to pass main window pointer from application to MFC framework which is used in CWinApp or CWinThread.
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MFC hides WinMain in its framework and includes source file on WinMain(). This explains how framework calls global CWinApp::Initinstance() from entry WinMain.
This is constructed during global C++ objects are constructed and is already available when Windows calls the WinMain function, which is supplied by the ...
Define a custom Window class structure, Register the class name, CreateWindow, Show windows and write message get and dispatch loop statements. Define the Window CallBack procedure and write the handlers.
DispatchMessage() is a API which indirectly triggers the Window CallBack procedure. Message structure members from this function are passed to the CallBack procedure. CallBack procedure should implement event handlers depending on the need of the application.
LPARAM and WPARAM are the two parameters in Window CallBack procedure. They signifies parameters of various events. They are used in handing individual events.
We need to write WinMain and need to follow all these in a Win32 application. However we need not to write much if we are writing an application with MFC ...
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