第2次win32窗口程序设计.ppt

声明消息处理函数原型 void OnLButtonDown(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); void OnPaint(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); void OnDestroy(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); void OnLButtonDown(HWND hWnd,UINT message, WPARAM wParam, LPARAM lParam) { ShowText=Hello!; InvalidateRect(hWnd,NULL,1); } void OnPaint(HWND hWnd,UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; hdc=BeginPaint(hWnd,ps); TextOut(hdc,50,50,ShowText,6); EndPaint(hWnd,ps); } void OnDestroy(HWND hWnd,UINT message,WPARAM wParam, LPARAM lParam) { PostQuitMessage(0); } 程序代码 #include windows.h //与Windows窗口定义相关的头文件 char *lpszClassName=chuangko; //char *ShowText; char *ShowText1=ababav; LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM); //声明系统回调窗口处理函数 //该函数主要是处理窗口消息循环中的消息 //一个事件发生后，windows会产生一个消息，传递给指定的窗口进行处理，既然这样，必须有借口给系统来调用，这个LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM)中第1个参数，是消息要传递的窗口，参数2是消息的id(也就是这是个什么样的消息，比如鼠标左键按下对应的消息是WM_LBUTTONDOWN)，参数3和参数4是消息的具体内容 void OnLButtonDown(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); void OnPaint(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); void OnDestroy(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam); ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASS wc; wc.style=0; wc.lpfnWndProc=WndProc; wc.cbClsExtra=0; wc.cbWndExtra=0; wc.hInstance=hInstance; wc.hIcon=LoadIcon(NULL,IDI_APPLICATION); wc.hCursor=LoadCursor(NULL,IDC_ARROW); wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH); wc.lpszMenuName=NULL; wc.lpszClassName=lpszClassName; return RegisterClass(wc); } void OnLButtonDown(HWND hWnd,UINT message, WPARAM wParam, LPARAM lParam) { ShowText1=Hello!; InvalidateRect(hWnd,NULL,1); } void OnRButtonDown(HWND hWnd,UINT message, WPARAM wParam, LPARAM lParam) { ShowText1=Morning!; InvalidateRect(hWnd,NULL,1); } void OnPaint(HWND hWnd,UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; hdc=BeginPaint(hWnd,