Sun Xin MFC Study Notes 1 windows application program running mechanism, mfc1windows

Sun Xin MFC Study Notes 1 windows application program running mechanism, mfc1windows
1. MSG structure

Hwnd: Window handle

Message: message Type

WParam & lParam: additional message information (such as key value)

Time: the time when the message is delivered.

 

Tip: typedef is used to differentiate the usage of a variable from the variable type.

2. WinMain

 

 

3. Procedure

 

4. Design window

5. Create, display, and update Windows

 

6. Callback Function

 

Tip: BeginPaint and EndPaint can only be used in response to the WM_PAINT message, while GetDC cannot be used here

Tip: if a constant is equal to a variable in the if statement, you should write the constant on the left (avoid writing =)

Tip: The GetMessage function returns 0 after obtaining a WM_QUIT message; otherwise, it returns a non-0 value (so you can use:

While (GetMessage (& msg, NULL, 0, 0 )){

//...

}

)

Tip: default is required for message loop. The operating system can provide some default message processing functions.

 

 

 

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