PRB: GetOpenFileName() Fails If lpstrFile Buffer Is Not NULL Terminated (222003)

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#include <Windows.h>

// If the next line is commented out, GetOpenFileName fails.
//#define NULL_TERMINATE

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, 
                            LPSTR szCmdLine, int nCmdShow)
{
   long	lErrMsg = 0;
   OPENFILENAME ofn;
   TCHAR sfile[MAX_PATH];

   ZeroMemory(&ofn, sizeof(ofn));

   ZeroMemory(sfile, sizeof(TCHAR)*MAX_PATH);

   #ifndef	NULL_TERMINATE
   // Not NULL terminated.
   {
   int i;
   for (i = 0; i < MAX_PATH; i++)
	   sfile[i] = ' ';
   }
   #else
      // NULL terminated.
   sfile[0] = '\0';
   #endif
 

   // Initialize OPENFILENAME structure.
   ofn.lStructSize = sizeof(ofn);
   ofn.hwndOwner = NULL; 
   ofn.lpstrFile = sfile; 
   ofn.nMaxFile = MAX_PATH;
   ofn.lpstrFilter = NULL;
   ofn.nFilterIndex = 1;
   ofn.lpstrTitle = TEXT("Please Select a File");
   ofn.lpstrInitialDir = NULL;
   ofn.lpstrCustomFilter = NULL;
   ofn.nMaxCustFilter = 0;
   ofn.lpstrFileTitle = NULL;
   ofn.nMaxFileTitle = 0;
   ofn.nFileOffset = 0;
   ofn.nFileExtension = 0;
   ofn.lpstrDefExt = NULL;
   ofn.lCustData = 0;
   ofn.lpfnHook = 0;
   ofn.lpTemplateName = 0;
   ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;

   // Call GetOpenFileName().
   if (GetOpenFileName(&ofn))
   {
	   MessageBox(NULL, TEXT("GetOpenFileName() Successful"), TEXT("OpenDialog"), MB_OK);
   }
   else
   {
      TCHAR		sErrMsg[256];
      lErrMsg = CommDlgExtendedError();
      wsprintf(sErrMsg,TEXT("Error %d returned from GetOpenFileName()"), lErrMsg);
      MessageBox(NULL, sErrMsg, TEXT("OpenDialog"), MB_OK);
   }

   return lErrMsg;
}