Attributes of main frame of a doc view/dialog based application can be described in CREATESTRUCT structure. Each memeber of this structure holds the corresponding attributes of a frame window.
DOC view framework creates CFrameWnd object after that calls PreCreateWindow() event. Verious frame attibutes can be changed in this event. Here is an example of altering style,position and height width of the window.
Here is the call stack of PreCreateWindow() from MFC framework.
CMainFrame::PreCreateWindow() CFrameWnd::GetIconWndClass() CFrameWnd::LoadFrame() CDocTemplate::CreateNewFrame() CSingleDocTemplate::OpenDocumentFile() CDocManager::OnFileNew() CWinApp::OnFileNew() _AfxDispatchCmdMsg()
OnCreate() event is an window event triggered by WM_CREATE message. Base function CFrameWnd::OnCreate() is called with same CREATESTRUCT pointer which is already altered in PreCreateWindow(). This is the actual creation of the frame window.
Here is the call stack of OnCreate() from MFC framework.
CMainFrame::OnCreate() CWnd::OnWndMsg() CWnd::WindowProc() AfxCallWndProc() AfxWndProc() AfxWndProcBase()
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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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