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这是鱼哥教我们的创建窗口的最基本的程序- #include <Windows.h>
- LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam , LPARAM lParam);
- int
- WINAPI
- WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int nCmdShow)
- {
- TCHAR *szWndClsName = TEXT("new window class");
- TCHAR *szWndName = TEXT("新窗口");
- 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_APPSTARTING);
- WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
- WndClass.lpszClassName = szWndClsName;
- WndClass.lpszMenuName = NULL;
- if( !RegisterClass(&WndClass) )
- {
- MessageBox(NULL, TEXT("注册窗口类失败"), TEXT("警告"), MB_OK | MB_ICONEXCLAMATION);
- return 0;
- }
- hWnd = CreateWindow(szWndClsName,
- szWndName,
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- NULL,
- NULL,
- hInstance,
- NULL);
- ShowWindow(hWnd, nCmdShow);
- 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)
- {
- HDC hDC;
- PAINTSTRUCT ps;
- RECT rect;
- TCHAR *szTextContent = TEXT("只有一行文字");
- switch(message)
- {
- case WM_PAINT:
- hDC = BeginPaint(hWnd, &ps);
- GetClientRect(hWnd, &rect);
- DrawText(hDC, szTextContent, -1, &rect,
- DT_CENTER | DT_VCENTER | DT_SINGLELINE | DT_END_ELLIPSIS);
- EndPaint(hWnd, &ps);
- return 0;
- case WM_DESTROY:
- PostQuitMessage(0);
- return 0;
- }
- return DefWindowProc(hWnd, message, wParam, lParam);
- }
复制代码 这个没问题
现在把while( GetMessage(&msg, NULL, 0, 0) )中的NULL改成hWnd。那么问题来了:可以关闭窗口,但是任务管理器中显示这个窗口的进程还在,因此,修改程序后生成不成功。
改成-1,关闭窗口直接卡住了。
哪位大神指点指点哈~~
貌似对GetMessage函数不是很理解~~
把WM_DESTROY下的return 0改为break试试
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