使用单元：uses Psapi;

 

//取得指定进程占用内存

function GetProcessMemUse(PID: Cardinal): Cardinal;
var
  pmc: PPROCESS_MEMORY_COUNTERS; // uses psApi
  ProcHandle: HWND;
  iSize: DWORD;
begin
  Result := 0;
  iSize := SizeOf(_PROCESS_MEMORY_COUNTERS);
  GetMem(pmc, iSize);
  try
    pmc^.cb := iSize;
    ProcHandle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ,
      False, PID); // 由PID取得进程对象的句柄
    if GetProcessMemoryInfo(ProcHandle, pmc, iSize) then
      Result := pmc^.WorkingSetSize;
  finally
    FreeMem(pmc);
  end;
end;

//取得当前进程占用内存
function CurrentMemoryUsage: Cardinal;
 var
   pmc: TProcessMemoryCounters;
 begin
   pmc.cb := SizeOf(pmc) ;
   if GetProcessMemoryInfo(GetCurrentProcess, @pmc, SizeOf(pmc)) then
     Result := pmc.WorkingSetSize
   else
     RaiseLastOSError;
 end;
//调用上面两个函数，返回当前进程占用内存
function GetCurrentMemUse: Cardinal;
begin
//  Result := GetProcessMemUse(GetCurrentProcessId);
    Result:= CurrentMemoryUsage ;
end;

//显示
procedure TForm1.tmr1Timer(Sender: TObject);
begin
  stat1.Panels[0].Text := format('memory use: %d KB', [GetCurrentMemUse div 1024]);//1kb=1024b
end;

需要引用Winapi.PsAPI，win7 xe7测试通过    http://blog.sina.com.cn/s/blog_44fa172f0102vcp3.html