1.枚举系统所有进程

方法很多，这里用EnumProcesses这个方法

DWORD aProcesses[1024], cbNeeded, cProcesses;
unsigned int i;

if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
        return;

cProcesses = cbNeeded / sizeof(DWORD);

for ( i = 0; i < cProcesses; i++ )
        PrintProcessNameAndID( aProcesses[i]);

aProcesses数组里包含了所有进程ID,使用EnumProcesses需要安装SDK,并且需要
Header: Declared in Psapi.h.
  Library: Use Psapi.lib.

这个函数在msdn上有详细的说明

2.根据进程ID获取进程文件名

有了进程ID  DWORD  dwProcessID

TCHAR szProcessName[MAX_PATH] = _T("");
TCHAR szProcessPath[MAX_PATH] = _T("");

HANDLE hProcess = NULL;
hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
                                   PROCESS_VM_READ,
                                   FALSE, dwProcessID);

if(hProcess != NULL)
{
HMODULE hMod;
        DWORD cbNeeded;
 

        if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod),
             &cbNeeded) )
        {
  
  DWORD  dwRetVal = 0;
  DWORD  dwRetValEx = 0;
            　　dwRetVal = GetModuleBaseName( hProcess, hMod, szProcessName,
                               sizeof(szProcessName) );

  dwRetValEx = GetModuleFileNameEx( hProcess, hMod, szProcessPath,
            sizeof(szProcessPath));

  if(dwRetVal > 0 && dwRetValEx > 0)
  {
   bRetVal = TRUE;
  }
  else
  {
   bRetVal = FALSE;
  }
 
        }

}

GetModuleBaseName只是获得文件名如QQ.exe,

GetModuleFileNameEx是获得文件名，包括路径，如E:/tool/Tencent/qq/QQ.exe

3.根据进程的句柄来判断，该进程是否是系统进程

BOOL  IsSysProcess(HANDLE hProcess)
{
	BOOL  bRetVal = FALSE;

	//1.OpenProcessToken
	HANDLE hToken = NULL;

	if(hProcess != NULL)
	{
		bRetVal = ::OpenProcessToken(hProcess,TOKEN_QUERY,&hToken);
	}

	//2.GetTokenInformation
	PTOKEN_USER  pToken_User = NULL;
	DWORD        dwTokenUser = 0L;

	if(hToken != NULL)
	{
		::GetTokenInformation(hToken, TokenUser, NULL,0L, &dwTokenUser);
	}

	if(dwTokenUser>0)
	{
		pToken_User = (PTOKEN_USER)::GlobalAlloc( GPTR, dwTokenUser );
	}

	if(pToken_User != NULL)
	{
		bRetVal = ::GetTokenInformation(hToken, 
			TokenUser, 
			pToken_User, 
			dwTokenUser, 
			&dwTokenUser);
	}

	//3.LookupAccountSid...
	TCHAR szAccName[MAX_PATH] = {0};
	TCHAR szDomainName[MAX_PATH] = {0};

	if(bRetVal != FALSE && pToken_User != NULL)
	{
		SID_NAME_USE eUse  = SidTypeUnknown;

		DWORD dwAccName    = 0L; 
		DWORD dwDomainName = 0L;

		PSID  pSid = pToken_User->User.Sid;

		bRetVal = ::LookupAccountSid(NULL,
			pSid, 
			NULL, 
			&dwAccName,
			NULL,
			&dwDomainName,
			&eUse );

		if(dwAccName>0 && dwAccName< MAX_PATH && dwDomainName>0 && dwDomainName <= MAX_PATH)
		{
			bRetVal = ::LookupAccountSid(NULL,
				pSid,szAccName,
				&dwAccName,
				szDomainName,
				&dwDomainName,
				&eUse );
		}
	}

	//4.Compant
	if(bRetVal != FALSE)
	{
		if(::_tcsnicmp(szAccName,TEXT("SYSTEM"),6) != 0L)
		{
			bRetVal = FALSE;
		}
	}

	//4.Free pToken_User
	if (pToken_User != NULL)
	{
		::GlobalFree( pToken_User );
	}

	//5.CloseHandle
	if(hToken != NULL)
	{
		::CloseHandle(hToken);
	}

	return bRetVal ;
}

返回TRUE,那么就说明是系统进程
如果返回FALSE，说明不是系统进程，是用户的