菜鸟在线请教问题,请高手帮忙

//获取win2000登陆用户
BOOL CSecurityTool::GetLogUser2K(CString& strName)
{
BOOL bRet = FALSE;
HANDLE hSnapshot = NULL;
strName = _T("");

__try
{
// Get a snapshot of the processes in the system
hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnapshot == NULL)
{
__leave;
}

PROCESSENTRY32 pe32;
pe32.dwSize = sizeof(pe32);

// Find the "System" process
BOOL fProcess = Process32First(hSnapshot, &pe32);
while (fProcess)
{
if (lstrcmpi(pe32.szExeFile, TEXT("explorer.exe")) == 0)
{
TCHAR szUserName[MAX_PATH];
if (GetProcessUser(pe32.th32ProcessID, szUserName, MAX_PATH))
{
bRet = TRUE;
strName = szUserName;
}

break;
}
fProcess = Process32Next(hSnapshot, &pe32);
}
if (!fProcess)
{
__leave; // Didn''t find "System" process
}
}
__finally
{
// Cleanup the snapshot
if (hSnapshot != NULL)
CloseHandle(hSnapshot);
}

return bRet;
}

//获取进程的用户名
BOOL CSecurityTool::GetProcessUser(DWORD dwProcessID, TCHAR *szUserName, DWORD nNameLen)
{
BOOL fResult = FALSE;
HANDLE hProc = NULL;
HANDLE hToken = NULL;
TOKEN_USER *pTokenUser = NULL;

__try
{
// Open the process with PROCESS_QUERY_INFORMATION access
hProc = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, dwProcessID);
if (hProc == NULL)
{
__leave;
}
fResult = OpenProcessToken(hProc, TOKEN_QUERY, &hToken);
if(!fResult)
{
__leave;
}

DWORD dwNeedLen = 0;
fResult = GetTokenInformation(hToken,TokenUser, NULL, 0, &dwNeedLen);
if (dwNeedLen > 0)
{
pTokenUser = (TOKEN_USER*)new BYTE[dwNeedLen];
fResult = GetTokenInformation(hToken,
TokenUser,
pTokenUser,
dwNeedLen,
&dwNeedLen);
if (!fResult)
{
__leave;
}
}
else
{
__leave;
}

SID_NAME_USE sn;
TCHAR szDomainName[MAX_PATH];
DWORD dwDmLen = MAX_PATH;
fResult = LookupAccountSid(NULL,
pTokenUser->User.Sid,
szUserName,
&nNameLen,
szDomainName,
&dwDmLen,
&sn);
}
__finally
{
if (hProc)
::CloseHandle(hProc);
if (hToken)
::CloseHandle(hToken);
if (pTokenUser)
delete[] (char*)pTokenUser;

return fResult;
}
}

这2个类是什么啊?自定义的?还是本身就可以直接用的?要怎样定义啊?我想得到用户名为什么还要输入参数?搞不懂.请高手能否告诉我下,怎样调用这2个类啊.或者怎样改.具体点,谢谢了.分少,不胜感激.