Thema: Delphi Speicher freigeben...

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#1

Speicher freigeben...

  Alt 7. Apr 2007, 16:28
Hi!

Ich mache mit folgendem Code einen Screenshot vom Aktuellen Desktop in einem bestimmten Intervall (z.B. alle 100 ms)... doch nach einer bestimmten Zeit ist natürlich der Arbeitsspeicher voll ...

Nun meine Frage:

Wie kann ich in diesem Beispiel den Arbeitsspeicher wieder freigeben???

Delphi-Quellcode:
function GetCursorInfo2: TCursorInfo;
var
 hWindow: HWND;
 pt: TPoint;
 pIconInfo: TIconInfo;
 dwThreadID, dwCurrentThreadID: DWORD;
begin
 Result.hCursor := 0;
 ZeroMemory(@Result, SizeOf(Result));
 // Find out which window owns the cursor
 if GetCursorPos(pt) then
 begin
   Result.ptScreenPos := pt;
   hWindow := WindowFromPoint(pt);
   if IsWindow(hWindow) then
   begin
     // Get the thread ID for the cursor owner.
     dwThreadID := GetWindowThreadProcessId(hWindow, nil);

     // Get the thread ID for the current thread
     dwCurrentThreadID := GetCurrentThreadId;

     // If the cursor owner is not us then we must attach to
     // the other thread in so that we can use GetCursor() to
     // return the correct hCursor
     if (dwCurrentThreadID <> dwThreadID) then
     begin
       if AttachThreadInput(dwCurrentThreadID, dwThreadID, True) then
       begin
         // Get the handle to the cursor
         Result.hCursor := GetCursor;
         AttachThreadInput(dwCurrentThreadID, dwThreadID, False);
       end;
     end
     else
     begin
       Result.hCursor := GetCursor;
     end;
   end;
 end;
end;

// 2. Capture the screen
function CaptureScreen: TBitmap;
var
 DC: HDC;
 ABitmap: TBitmap;
 MyCursor: TIcon;
 CursorInfo: TCursorInfo;
 IconInfo: TIconInfo;
begin
 // Capture the Desktop screen
 DC := GetDC(GetDesktopWindow);
 ABitmap := TBitmap.Create;
 try
   ABitmap.Width := GetDeviceCaps(DC, HORZRES);
   ABitmap.Height := GetDeviceCaps(DC, VERTRES);
   // BitBlt on our bitmap
   BitBlt(ABitmap.Canvas.Handle,
     0,
     0,
     ABitmap.Width,
     ABitmap.Height,
     DC,
     0,
     0,
     SRCCOPY);
   // Create temp. Icon
   MyCursor := TIcon.Create;
   try
     // Retrieve Cursor info
     CursorInfo := GetCursorInfo2;
     if CursorInfo.hCursor <> 0 then
     begin
       MyCursor.Handle := CursorInfo.hCursor;
       // Get Hotspot information
       GetIconInfo(CursorInfo.hCursor, IconInfo);
       // Draw the Cursor on our bitmap
       ABitmap.Canvas.Draw(CursorInfo.ptScreenPos.X - IconInfo.xHotspot,
                           CursorInfo.ptScreenPos.Y - IconInfo.yHotspot, MyCursor);
     end;
   finally
     // Clean up
     MyCursor.ReleaseHandle;
     MyCursor.Free;
   end;
 finally
   ReleaseDC(GetDesktopWindow, DC);
 end;
 Result := ABitmap;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
CaptureScreen.SaveToFile('C:\\meinbild.bmp');
end;
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