VC60 代码移植到VC2008 的异常之一

1。原代码

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

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

int WINAPI WinMain(
  HINSTANCE hInstance,      // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,          // command line
  int nCmdShow              // show state
)
{
 HWND hwnd;
 MSG msg;
 WNDCLASS wndcls;
 wchar_t lpszClassName[] = L"sunxin2006";
 wchar_t lpszTitle[] = L"http://www.sunxin.org";

 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.lpfnWndProc=WinSunProc;
 wndcls.lpszMenuName=NULL;
 wndcls.lpszClassName;
 wndcls.style=CS_HREDRAW | CS_VREDRAW;
 //RegisterClass(&wndcls);
 if(!RegisterClass(&wndcls))
 {
  MessageBeep(0);
  return FALSE;
 }
 //HWND hwnd;
 hwnd=CreateWindow(lpszClassName,
               lpszTitle,
       WS_OVERLAPPEDWINDOW,
       0,
               0,
               600,
       400,
       NULL,
       NULL,
       hInstance,
       NULL);

 ShowWindow(hwnd,SW_SHOWNORMAL);
 UpdateWindow(hwnd);

 //MSG msg;
 while(GetMessage(&msg,NULL,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }
 return msg.wParam;
}

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
 switch(uMsg)
 {
 case WM_CHAR:
  //wchar_t szChar[20];
  char szChar[20];
  sprintf_s(szChar,"char code is %d",wParam);  //sprintf -> sprintf_s
  MessageBox(hwnd,(LPCWSTR)szChar,L"char",0);
  break;
 case WM_LBUTTONDOWN:
  MessageBox(hwnd,L"mouse clicked",L"message",0);
  HDC hdc;
  hdc=GetDC(hwnd);
  TextOut(hdc,0,50,L"程序员之家",strlen("程序员之家"));
  //ReleaseDC(hwnd,hdc);
  break;
 case WM_PAINT:
  HDC hDC;
  PAINTSTRUCT ps;
  hDC=BeginPaint(hwnd,&ps);
  TextOut(hDC,0,0,L"http://www.sunxin.org",strlen("http://www.sunxin.org"));
  EndPaint(hwnd,&ps);
  break;
 case WM_CLOSE:
  if(IDYES==MessageBox(hwnd,L"是否真的结束？",L"message",MB_YESNO))
  {
   DestroyWindow(hwnd);
  }
  break;
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
 default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);
 }
 return 0;
}
2。编译正常，运行以下看看？会有什么状况发生？

3。编译正常，不代表程序没有错误，VC2008还需要进一步完善。不知道2010怎么样。有知道的同仁告知一下。谢谢。