winapi - Enumerate running processes in Delphi

Question

How do I get a list of the running processes (with details of PID, Owner etc) on my machine using Delphi?

EDIT: None of the solutions proposed gives me the user that owns the process, only info such as PID, ExeName etc...

Answer 1

One way is using the Tool Help library (see TlHelp32 unit), or EnumProcesses on Windows NT (see PsAPI unit). Have a look at JclSysInfo.RunningProcessesList in the JCL for an example.

Here's a quick example of how to get the user name of a process:

type
  PTokenUser = ^TTokenUser;
  TTokenUser = packed record
    User: SID_AND_ATTRIBUTES;
  end;

function GetProcessUserName(ProcessID: Cardinal; out DomainName, UserName: string): Boolean;
var
  ProcessHandle, ProcessToken: THandle;
  InfoSize, UserNameSize, DomainNameSize: Cardinal;
  User: PTokenUser;
  Use: SID_NAME_USE;
  _DomainName, _UserName: array[0..255] of Char;
begin
  Result := False;
  DomainName := '';
  UserName := '';

  ProcessHandle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, ProcessID);
  if ProcessHandle = 0 then
    Exit;

  try
    if not OpenProcessToken(ProcessHandle, TOKEN_QUERY, ProcessToken) then
      Exit;

    try
      GetTokenInformation(ProcessToken, TokenUser, nil, 0, InfoSize);
      User := AllocMem(InfoSize * 2);
      try
        if GetTokenInformation(ProcessToken, TokenUser, User, InfoSize * 2, InfoSize) then
        begin
          DomainNameSize := SizeOf(_DomainName);
          UserNameSize := SizeOf(_UserName);

          Result := LookupAccountSid(nil, User^.User.Sid, _UserName, UserNameSize, _DomainName, DomainNameSize, Use);

          if Result then
          begin
            SetString(DomainName, _DomainName, StrLen(_DomainName));
            SetString(UserName, _UserName, StrLen(_UserName));
          end;
        end;
      finally
        FreeMem(User);
      end;
    finally
      CloseHandle(ProcessToken);
    end;
  finally
    CloseHandle(ProcessHandle);
  end;
end;