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[Remko]

Some more info on the memory leak. I ran this testprogram:

Delphi-Quellcode:

program WTSLeak;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  JwaWindows;

  type
  { array of TWtsSessionInfoA }
  PWTSSessionInfoAArray = ^TWTSSessionInfoAArray;
  TWTSSessionInfoAArray = array[0..ANYSIZE_ARRAY-1] of TWtsSessionInfoA;

  { array of TWtsSessionInfoW }
  PWTSSessionInfoWArray = ^TWTSSessionInfoWArray;
  TWTSSessionInfoWArray = array[0..ANYSIZE_ARRAY-1] of TWtsSessionInfoW;

var
  SessionInfoPtr: PWTSSessionInfoWArray;
  pCount: DWORD;
  i,j: Integer;
  bRes: Boolean;
  ppBuffer: PWideChar;
  pBytesReturned: DWORD;
begin
  for j := 0 to 10000 do
  begin
    bRes := WTSEnumerateSessionsW(WTS_CURRENT_SERVER, 0, 1,
      PWtsSessionInfoW(SessionInfoPtr), pCount);

    if bRes then
    begin

      for i := 0 to PCount - 1 do
      begin
        bRes := WTSQuerySessionInformationW(WTS_CURRENT_SERVER,
          SessionInfoPtr^[i].SessionId, WTSApplicationName, Pointer(ppBuffer),
          pBytesReturned);

        if bRes then
        begin
          WriteLn(Format('ApplicationName=%s', [ppBuffer]));
          WTSFreeMemory(Pointer(ppBuffer));
        end
        else begin
          WriteLn(Format('WTSQuerySessionInformation for Session %d failed with error %s',
            [SessionInfoPtr^[i].SessionId, SysErrorMessage(GetLastError)]));
        end;
      end;

      WTSFreeMemory(SessionInfoPtr);
    end
    else begin
      WriteLn(Format('WTSEnumerateSessions failed with error %s',
        [SysErrorMessage(GetLastError)]));
    end;
  end;

  ReadLn;

end.

If I look in the VMSize/Private Working Set column of task manager (do not use the Memory Usage/Working Set column) we can cleary see that we leak memory on every call to WTSQuerySessionInformation. I also ran it through a profiler which clearly showed that the memory is being allocated in wtsapi32.dll. Further testing shows that the memory is only leaked when the call to WTSQuerySessionInformation fails (it does this on special sessions like the console and the listener sessions). If the call does fail wtsapi leaks exactly 2664 bytes on each call, which is the size of WinStationQueryInformation structure 1 (this is an undocumented api called by wtsapi32.dll internally).