API程序框架

 

#include <windows.h>

 

//消息处理函数

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

       HDC hdc ;  //设备内容句柄

    PAINTSTRUCT ps;   //绘图信息结构

    RECT rect;    //矩形结构

       switch (message)

       {    

              case WM_CREATE:   

            PlaySound ( TEXT("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC);

            return 0;

 

        case WM_PAINT:  //必须成对地呼叫BeginPaint和EndPaint,中间是GDI函数

            hdc = BeginPaint (hWnd, &ps);

      

            GetClientRect (hWnd, &rect);

            ::TextOut(hdc,100,100,"hello",5);

                     DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect,DT_SINGLELINE | DT_CENTER | DT_VCENTER);

          

                     EndPaint (hWnd, &ps);    

            return 0;

  

        case WM_DESTROY:

            PostQuitMessage (0);

            return 0;

   }

   return DefWindowProc (hWnd, message, wParam, lParam);  //系统定义的消息处理方法

 

}

//程序入口

int APIENTRY WinMain(HINSTANCE hInstance,          //执行实体句柄 

                     HINSTANCE hPrevInstance,      //NULL

                     LPSTR     lpCmdLine,    //用于执行程序的命令列

                     int       nCmdShow)  //指出程序最初显示的方式

{

       //注册窗口

      static TCHAR szAppName[] = TEXT ("HelloWin");   //注册名

    HWND   hwnd ;  //窗口句柄

    MSG    msg ;   //消息结构

       

       WNDCLASS wcex;  //窗口类别结构

       wcex.style                    = CS_HREDRAW | CS_VREDRAW;

       wcex.lpfnWndProc       = WndProc;    //消息处理函数

       wcex.cbClsExtra           = 0;

       wcex.cbWndExtra         = 0;

       wcex.hInstance             = hInstance;

       wcex.hIcon                  = LoadIcon(hInstance, IDI_APPLICATION);

       wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);

       wcex.hbrBackground     = (HBRUSH) GetStockObject (WHITE_BRUSH);

       wcex.lpszMenuName     = NULL;

       wcex.lpszClassName     = szAppName;    //注册名称

 

 

       if(!RegisterClassA(&wcex))

              MessageBox(NULL,"error!",szAppName,MB_ICONERROR);

 

   //创建窗口

 hwnd=CreateWindow(szAppName,TEXT("TheHelloProgram"),WS_OVERLAPPEDWINDOW,

      CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

 

   if (!hwnd)

   {

      return FALSE;

   }

 

   ShowWindow(hwnd, nCmdShow);   //在显示器上显示窗口

   UpdateWindow(hwnd);   //重画显示区域，会向窗口发送WM_PAINT消息处理程序

 

       //循环消息

       while (GetMessage(&msg, NULL, 0, 0))

       {

                     TranslateMessage(&msg);   //将msg结构传给Windows

                     DispatchMessage(&msg);   //Windows将呼叫窗口消息处理程序

       }

 

       return msg.wParam;

}