windows窗口编程

#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int iCmdShow)
{
 static TCHAR szAppName[]=TEXT("HelloWin");
 HWND hwnd;
 MSG msg;
 WNDCLASS wndclass;
 wndclass.style=CS_HREDRAW|CS_VREDRAW;
 wndclass.lpfnWndProc=WndProc;
 wndclass.cbClsExtra=0;
 wndclass.hInstance=hInstance;
 wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
 wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
 wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 wndclass.lpszMenuName=NULL;
 wndclass.lpszClassName=szAppName;
 if(!RegisterClass(&wndclass))
 {
  MessageBox(NULL,TEXT("This program requires Windows NT"),szAppName,MB_ICONERROR);
  return 0;
 }
 hwnd=CreateWindow(szAppName,TEXT("The Hellp Program"),
  WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  NULL,
  NULL,
  hInstance,
  NULL);
 ShowWindow(hwnd,iCmdShow);
 UpdateWindow(hwnd);
 while(GetMessage(&msg,NULL,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }
 return msg.wParam;


}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 RECT rect;
 switch(message)
 {
 case WM_CREATE:
  //PlaySound(TEXT("hellowin.wav"),NULL,SND_FILENAME|SND_ASYNC);
  return 0;
 case WM_PAINT:
  hdc=BeginPaint(hwnd,&ps);
  GetClientRect(hwnd,&rect);
  DrawText(hdc,TEXT("Hello,Window98"),-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);
}