Delphi Active Window Screenshot

Question

I am trying to add capture screenshot of active window using this code

procedure ScreenShot(activeWindow: bool; destBitmap : TBitmap) ;
 var
    w,h : intege         


        

Answer 1

I don't know what kind of visual styling components you're using (the form icon indicates it's Delphi 7, though).

This code works perfectly for me:

function CaptureWindow(const WindowHandle: HWnd): TBitmap;
var
  DC: HDC;
  wRect: TRect;
  Width, Height: Integer;
begin
  DC := GetWindowDC(WindowHandle);
  Result := TBitmap.Create;
  try
    GetWindowRect(WindowHandle, wRect);
    Width := wRect.Right - wRect.Left;
    Height := wRect.Bottom - wRect.Top;
    Result.Width := Width;
    Result.Height := Height;
    Result.Modified := True;
    BitBlt(Result.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY);
  finally
    ReleaseDC(WindowHandle, DC);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  Capture: TBitmap;
begin
  //  For active window, change Handle to GetForegroundWindow()
  Capture := CaptureWindow(Handle);  
  try
    Capture.SaveToFile('E:\TempFiles\ScreenCapture2014.bmp');
  finally
    Capture.Free;
  end;
end;

Here's the image I captured: