... get info on memory usage from a given process?

//...

uses
  psAPI;


//...

function GetProcessMemorySize(_sProcessName: string; var _nMemSize: Cardinal): Boolean;
var
  l_nWndHandle, l_nProcID, l_nTmpHandle: HWND;
  l_pPMC: PPROCESS_MEMORY_COUNTERS;
  l_pPMCSize: Cardinal;
begin
  l_nWndHandle := FindWindow(nil, PChar(_sProcessName));

  if l_nWndHandle = 0 then 
  begin
    Result := False;
    Exit;
  end;

  l_pPMCSize := SizeOf(PROCESS_MEMORY_COUNTERS);

  GetMem(l_pPMC, l_pPMCSize);
  l_pPMC^.cb := l_pPMCSize;

  GetWindowThreadProcessId(l_nWndHandle, @l_nProcID);
  l_nTmpHandle := OpenProcess(PROCESS_ALL_ACCESS, False, l_nProcID);

  if (GetProcessMemoryInfo(l_nTmpHandle, l_pPMC, l_pPMCSize)) then
    _nMemSize := l_pPMC^.WorkingSetSize
  else
    _nMemSize := 0;

  FreeMem(l_pPMC);

  Result := True;
end;

//Beispiel

procedure TForm1.Button1Click(Sender: TObject);
var
  l_nSize: Cardinal;
begin
  if (GetProcessMemorySize('Unbenannt - Editor', l_nSize)) then
    ShowMessage('Size: ' + IntToStr(l_nSize) + ' byte')
  else
    ShowMessage('Error');
end;

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