创建窗口的代码及分析

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1、#include#includeLRESULTCALLBACKWinSunProc(HWNDhwnd,//handletowindowUINTuMsg,//messageidentifierWPARAMwParam,//firstmessageparameterLPARAMlParam//secondmessageparameter);intWINAPIWinMain(HINSTANCEhInstance,//handletocurrentinstanceHINSTANCEhPrevInstance,//handletoprevi

2、ousinstanceLPSTRlpCmdLine,//commandlineintnCmdShow//showstate){WNDCLASSwndcls;wndcls.cbClsExtra=0;wndcls.cbWndExtra=0;wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);wndcls.hInstance=hInstance;wndcls

3、.lpfnWndProc=WinSunProc;wndcls.lpszClassName="……";wndcls.lpszMenuName=NULL;wndcls.style=CS_HREDRAW

4、CS_VREDRAW;//“

5、”表示或者，“&~”在原有特征中去掉某特征；RegisterClass(&wndcls);HWNDhwnd;hwnd=CreateWindow("……","……",WS_OVERLAPPEDWINDOW,0,0,600,400,NULL,NULL,hInstance,NULL);ShowWindow(hwnd,SW_SHOWNORMAL);Upd

6、ateWindow(hwnd);MSGmsg;while(GetMessage(&msg,NULL,0,0))//若第二个参数为hwnd则只对hwnd处理，NULL对所有消息处理//必须设为NULL，否则死循环，机器变慢；{TranslateMessage(&msg);DispatchMessage(&msg);//该步骤执行回调函数WinSunProc;}//循环return0;//或者returnmsg.wParam；}LRESULTCALLBACKWinSunProc(HWNDhwnd,//handletowindow那个窗口UINTuMsg,//messagei

7、dentifierWPARAMwParam,//firstmessageparameterLPARAMlParam//secondmessageparameter){HPENhpen;HPENholdpen;switch(uMsg){caseWM_CHAR:charszChar[20];sprintf(szChar,"charis%d",wParam);//将字符串和int型连接，赋给szChar;MessageBox(hwnd,szChar,"weixin",0);break;caseWM_LBUTTONDOWN:MessageBox(hwnd,"mouseclick

8、ed","weixin",0);HDChdc;hdc=GetDC(hwnd);//用hdc保存GetDc函数返回的与特定窗口相关联的句柄，指定画布；hpen=CreatePen(PS_SOLID,3,RGB(255,0,0));//创建画笔，RGB红绿蓝参数；holdpen=(HPEN)SelectObject(hdc,hpen);//将hpen和hdc联系，保存返回值；Ellipse(hdc,100,100,200,200);//实现左击画一个内切圆；SelectObject(hdc,holdpen);//保存，恢复以前的默认值；TextOut(hdc,0,50,"c

9、omputerprogramingtraining",strlen("computerprograming"));//在指定位置输出文字；ReleaseDC(hwnd,hdc);//使用完后释放资源，否则引起内存泄露；break;caseWM_PAINT://当部分窗口无效时重绘窗口，HDChDC;//定义变量hdcPAINTSTRUCTps;hDC=BeginPaint(hwnd,&ps);//获得上下文的句柄，（窗口，用于接收绘制信息的结构体指针）；TextOut(hDC,0,0,"hello",strlen("hello"));En