119.WIN32窗口原理

 #include <Windows.h>

 //处理消息的回调函数
 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

 int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hpreinstance, PSTR szcmdline, int icmdshow)
 {
     //设置窗口的名字
     static TCHAR szappname[] = TEXT("mywindow");

     //窗口类
     WNDCLASS wndclass;
     //风格
     wndclass.style = CS_HREDRAW | CS_VREDRAW;
     wndclass.lpszClassName = szappname;//设置名字
     wndclass.lpszMenuName = NULL;
     wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);//设置背景
     wndclass.lpfnWndProc = WndProc;//设置回调函数处理窗口
     wndclass.cbClsExtra = wndclass.cbWndExtra = ;//拓展
     wndclass.hInstance = hinstance;//窗口句柄
     wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);//载入图标
     wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);//载入鼠标风格

     //通过名字,注册窗口
     if (!RegisterClass(&wndclass))
     {
         MessageBoxA(, "窗口注册失败", "提示", );
         return ;
     }

     //通过名字,创建窗口
     HWND hwnd = CreateWindow(szappname,//窗口名字
         TEXT("窗口"),//窗口标题
         WS_OVERLAPPEDWINDOW,//窗口风格
         CW_USEDEFAULT,//默认显示位置x
         CW_USEDEFAULT,//默认显示位置y
         CW_USEDEFAULT,//默认宽度
         CW_USEDEFAULT,//默认高度
         NULL,//子窗口
         NULL,//子菜单
         hinstance,//窗口句柄
         NULL);

     ShowWindow(hwnd, SW_SHOW);
     UpdateWindow(hwnd);//显示并更新
     MSG msg;//消息
     //消息循环(GetMessage 创建事件 TranslateMessage DispatchMessage响应事件)
     while (GetMessage(&msg,NULL,,))
     {
         TranslateMessage(&msg);
         //调用回调函数
         DispatchMessage(&msg);
     }

     return msg.wParam;
 }

 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
 {
     //设备环境
     HDC hdc;
     PAINTSTRUCT ps;
     RECT rect;
     switch (message)
     {
     case WM_LBUTTONDOWN:
         MessageBoxA(, "按下鼠标左键", "提示", );
         break;
     case WM_RBUTTONDOWN:
         MessageBoxA(, "按下鼠标左键", "提示", );
         break;
     case WM_CLOSE:
         if (MessageBoxA(, "是否关闭窗口", "提示", ) == )
         {
             //关闭窗口,发送WM_DESTROY消息
             DestroyWindow(hwnd);
         }
         else
         {
             return ;
         }
         break;
     case WM_DESTROY:
         MessageBoxA(, "已成功关闭", "提示", );
         exit();
         break;
     default:
         break;
     }
     return DefWindowProc(hwnd, message, wparam, lparam);
 }