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发表于 2014-7-15 21:15:40
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常用的窗口关闭判断由三个消息构成:,WM_SYSCOMMAND,WM_CLOSE和WM_DESTROY以下代码模拟了它们出现的顺序.用非客户区点击判断也可以,但是不常用.
- #include <windows.h>
- #include <stdio.h>
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("HelloWin") ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, // window class name
- TEXT ("The Hello Program"), // window caption
- WS_OVERLAPPEDWINDOW, // window style
- CW_USEDEFAULT, // initial x position
- CW_USEDEFAULT, // initial y position
- CW_USEDEFAULT, // initial x size
- CW_USEDEFAULT, // initial y size
- NULL, // parent window handle
- NULL, // window menu handle
- hInstance, // program instance handle
- NULL) ; // creation parameters
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- switch (message)
- {
- case WM_CREATE:
- return 0 ;
- case WM_SYSCOMMAND:
- if( wParam == SC_CLOSE )
- {
- MessageBox(hwnd, "WM_SYSCOMMAND,窗口还在,还可以撤销操作", "Msg", 0 );
- SendMessage( hwnd, WM_CLOSE, 0, 0 );
- }
- return 0;
- case WM_CLOSE:
- {
- MessageBox(hwnd, "WM_CLOSE,窗口还在,还可以撤销操作", "Msg", 0 );
- DestroyWindow( hwnd );
- return 0;
- }
- case WM_DESTROY:
- {
- MessageBox(hwnd, "WM_DESTROY,窗口不在,不可以撤销操作", "Msg", 0 );
- PostQuitMessage (0) ;
- return 0 ;
- }
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
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