#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
 static TCHAR szAppName[]=TEXT("chap231");
  HWND hwnd;
 MSG   msg;
 WNDCLASS wndclass;
 wndclass.style =CS_HREDRAW|CS_VREDRAW;
 wndclass.lpfnWndProc =WndProc;
 wndclass.cbClsExtra =0;
 wndclass.cbWndExtra =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))
  return 0;
 hwnd=CreateWindow(NULL,
  szAppName,
   TEXT
   WS_OVERLAPPEDWINDOW,
   CW_USEDEFAULT,
   CW_USEDEFAULT,
   CW_USEDEFAULT,
   CW_USEDEFAULT,
   NULL,
   NULL,
   hInstance,
   0);
 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)
{
 int input;
 switch(message)
 {
 case WM_DESTROY:
   PostQuitMessage(0);
   return 0;
 case WM_CLOSE:
  input=MessageBox(hwnd,TEXT("你真的决定退出吗？"),TEXT("退出"),
   MB_YESNO|MB_ICONQUESTION);
 }
  switch(input)
  { case IDYES:
  break;
  case IDN
   return 0;
  }
  return DefWindowProc(hwnd,message,wParam,lParam);
}