TerminateProcess终止进程失败

今天写了个自动升级程序，   该程序从服务器下载客户端最新版本， 然后通过查找客户端进程的方式， 使用TerminateProcess终止进程, 代码如下：

void KillProcess(  CString strProName )
{
	PROCESSENTRY32 pe32;	
	pe32.dwSize = sizeof(pe32);												
	HANDLE hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);		
	if(hProcessSnap == INVALID_HANDLE_VALUE)
		return;


	CString str;
	BOOL bMore = ::Process32First(hProcessSnap, &pe32);	
	CString strProcessName = _T("");
	strProName.MakeUpper();
	while(bMore)
	{
		bMore = ::Process32Next(hProcessSnap, &pe32);
		strProcessName = pe32.szExeFile;
		strProcessName.MakeUpper();
		if(strProcessName.Find( strProName ) != -1)
		{
			
			HANDLE hdl = OpenProcess(PROCESS_ALL_ACCESS,TRUE,pe32.th32ProcessID);
			
			TerminateProcess(hdl,0);
			::CloseHandle(hProcessSnap);
			return;
		}
	}
	::CloseHandle(hProcessSnap);
}

在win7上面正常，  但是在xp系统上，却发现，升级程序终止客户端进程失败，跟踪了下代码，发现执行

<pre name="code" class="cpp">OpenProcess(PROCESS_ALL_ACCESS,TRUE,pe32.th32ProcessID)

失败，  错误码 5，拒绝访问，

后来上网查询了一番，终于发现是因为权限问题，并找到一段代码

BOOL EnableDebugPrivilege()

{
  HANDLE hToken;
  BOOL fOk=FALSE;
  if(OpenProcessToken(GetCurrentProcess(),TOKEN_ADJUST_PRIVILEGES,&hToken))
  {
    TOKEN_PRIVILEGES tp;
    tp.PrivilegeCount=1;
    LookupPrivilegeValue(NULL,SE_DEBUG_NAME,&tp.Privileges[0].Luid);
    tp.Privileges[0].Attributes=SE_PRIVILEGE_ENABLED;

    AdjustTokenPrivileges(hToken,FALSE,&tp,sizeof(tp),NULL,NULL);
   
    fOk=(GetLastError()==ERROR_SUCCESS);
    CloseHandle(hToken);
  }
    return fOk;
}

现在贴出完整代码：

void KillProcess(  CString strProName )
{
	PROCESSENTRY32 pe32;	
	pe32.dwSize = sizeof(pe32);												
	HANDLE hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);		
	if(hProcessSnap == INVALID_HANDLE_VALUE)
		return;

	CString str;
	BOOL bMore = ::Process32First(hProcessSnap, &pe32);	
	CString strProcessName = _T("");
	strProName.MakeUpper();
	while(bMore)
	{
		bMore = ::Process32Next(hProcessSnap, &pe32);
		strProcessName = pe32.szExeFile;
		strProcessName.MakeUpper();
		if(strProcessName.Find( strProName ) != -1)
		{
			
			HANDLE hdl = OpenProcess(PROCESS_ALL_ACCESS,TRUE,pe32.th32ProcessID);
			if ( !hdl )
			{
				EnableDebugPrivilege();
				hdl = OpenProcess(PROCESS_ALL_ACCESS,TRUE,pe32.th32ProcessID);
			}
			TerminateProcess(hdl,0);
			::CloseHandle(hProcessSnap);
			return;
		}
	}
	::CloseHandle(hProcessSnap);
}