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#include <windows.h>
#include <stdio.h>

HWND hWnd=NULL; // 保存 Windows 分配給程序的窗口句柄，它是全局的

LRESULT APIENTRY MainWndProc(HWND,UINT,WPARAM,LPARAM);
void MyMsgLoop();

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    char clsName[]="myWnd";
    WNDCLASS wc;  //創(chuàng )建一個(gè)Windows窗體
    wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;// 窗體風(fēng)格
    wc.lpfnWndProc = MainWndProc; //   窗體進(jìn)程的指針
    wc.cbClsExtra = 0L;
    wc.cbWndExtra = 0L;
    wc.hInstance = hInstance;// 窗體進(jìn)程實(shí)例的句柄，通過(guò)WinMain主函數傳遞進(jìn)來(lái)
    wc.hIcon = NULL;
    wc.hCursor = NULL;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW);// 背景畫(huà)刷，也就是窗口顯示背景顏色
    wc.lpszMenuName = NULL;
    wc.lpszClassName = clsName;// 注冊的Windows類(lèi)名稱(chēng)

    RegisterClass(&wc);//調用RegisterClass函數進(jìn)行注冊
    / /具備了創(chuàng )建一個(gè)窗體的信息，開(kāi)始調用API函數CreateWindow來(lái)進(jìn)行窗體的創(chuàng )建工作
    hWnd = CreateWindow(clsName,"主窗口",
       WS_OVERLAPPEDWINDOW|WS_CLIPCHILDREN|WS_CLIPSIBLINGS,
       100, 100,400, 300,NULL,NULL,hInstance,NULL); // 創(chuàng )建窗口
    ShowWindow( hWnd, SW_SHOWDEFAULT ); // 顯示窗口
    UpdateWindow( hWnd );   // 刷新窗口
   //UpdateWindow函數用于更新窗口，該函數更新窗口的時(shí)候會(huì )向指定的窗體的進(jìn)程發(fā)送消息，如果被更新的客戶(hù)區為空，說(shuō)明窗體沒(méi)有接收到消息。
    MyMsgLoop();     // 進(jìn)入消息循環(huán)
    return 0;
}

LRESULT APIENTRY MainWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam )
{// 消息處理
    switch(message) 
    {
     case WM_CREATE:  // 當收到建立窗口的消息時(shí)，進(jìn)行處理...
        return 0;
        break;
     case WM_CLOSE:  // 當收到關(guān)閉窗口的消息時(shí)，進(jìn)行處理...
        MessageBox(NULL,"窗口要關(guān)閉了","消息提示",MB_OK|MB_ICONEXCLAMATION); 
        PostQuitMessage(0);
        return 0;
        break;
     case WM_DESTROY: // 當退出消息的時(shí)候，進(jìn)行處理...
        MessageBox(NULL,"退出消息了","消息提示",MB_OK|MB_ICONEXCLAMATION); 
        PostQuitMessage(0);
        return 0;
        break;
      default:
      break;
    }
    return (DefWindowProc(hWnd, message, wParam, lParam));
}

void MyMsgLoop()
{ 
    MSG msg; 
    BOOL receiveMessage;
    PeekMessage(&msg, NULL, 0U, 0U, PM_NOREMOVE);
    while(msg.message != WM_QUIT) 
    { // 消息循環(huán)
       receiveMessage = PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE);
       if(receiveMessage) 
       { // 有消息
        TranslateMessage(&msg);
        DispatchMessage(&msg);
       }
    }
}