请教GetFileTime读取文件时间

[没原来那个名字长了]

完整代码:

  void CmacDlg::OnBnClickedButton3()
  {
	  // TODO: 在此添加控件通知处理程序代码

	static LPFILETIME  filetime1;
	static LPFILETIME  filetime2;
	static LPFILETIME  filetime3;

//HANDLE file=CFile(_T("data\\card.dat"), CFile::modeRead);
	HANDLE hDir = ::CreateFile (_T("data\\card.dat"), GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
	::GetFileTime(hDir,filetime1,filetime2,filetime3);
CString   str1,str2,strTime;
filetime3->dwHighDateTime;
filetime3->dwLowDateTime;
//str1.Format("%d",(filetime3->dwHighDateTime));
//str2.Format("%d",time2);
//strTime=str1+str2;
//MessageBox(strTime);
}

以上代码GetFileTime总是00000000
请教各位大大我哪里错了.....

[WaistCoatX]

判断下hDir 是否为NULL？？

[WaistCoatX]

判断下GetFileTime返回值，如果失败调用GetLastError看看错误码

[没原来那个名字长了]

居然被我乱试可以了......

 HANDLE hFile = CreateFile (_T("data\\card.dat"), GENERIC_READ, 
        FILE_SHARE_READ, 
        NULL, OPEN_EXISTING, 
        FILE_FLAG_BACKUP_SEMANTICS, NULL); 
        FILETIME ftCreate, ftAccess, ftWrite;
        if(hFile!=INVALID_HANDLE_VALUE) 
        { 
           //ftWrite就是最后修改时间
          GetFileTime(hFile, &ftCreate, &ftAccess, &ftWrite); 
        }
        CloseHandle(hFile); 
		SYSTEMTIME stUTC; 
        FileTimeToSystemTime(&ftWrite, &stUTC); 
		CString   str1,str2,str3,strTime;
		str1.Format("%d",stUTC.wYear);
		str2.Format("%d",stUTC.wMonth);
		str3.Format("%d",stUTC.wDay);
		strTime=str1+str2+str3;
		MessageBox(str1+str2+str3);