为什么会坠毁?

我一直在敲我的头…我不能假装是一个C++的家伙…

    TCHAR * pszUserName = userName.GetBuffer();
SID sid;
SecureZeroMemory(&sid, sizeof(sid));
SID_NAME_USE sidNameUse;
DWORD cbSid = sizeof(sid);

pLog->Log(_T("Getting the SID for user [%s]"), 1, userName);

if (!LookupAccountName(NULL, (LPSTR)pszUserName, &sid, &cbSid, NULL, 0, &sidNameUse))
{
    pLog->Log(_T("Failed to look up user SID. Error code: %d"),1,  GetLastError());
    return _T("");
}

pLog->Log(_T("Converting binary SID to string SID"));

消息“getting the sid for user[x]is writed”,但随后应用程序崩溃。我想是 LookupAccountName 打电话。

编辑:

哎哟! userName 是MFC CString