http://stackoverflow.com/questions/23755232/dcef3-how-to-get-a-screenshot

DCEF3: How to get a screenshot

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How to get screenshot of browser in DCEF3?

I create browser like this without VCL. The TakePicture method will only work if

  • No debugger is used

  • If ShowWindow is used

    var
  info: TCefWindowInfo;
  Settings: TCefBrowserSettings;
begin
  FillChar(info, SizeOf(info), 0);
  info.width := width;
  info.height := height;
  FillChar(Settings, SizeOf(TCefBrowserSettings), 0);
  Settings.Size := SizeOf(TCefBrowserSettings);
  GetSettings(Settings);
  CefBrowserHostCreateBrowser(@info, FHandler, FDefaultUrl, @settings, nil);
end;

procedure TakePicture(const Browser: ICefBrowser; Height, Width: Integer);
var
  DC: HDC;
  Bmp : TBitmap;
  Handle : HWND;
  Rect : trect;
  BarHeight : integer;
  BarLeft : integer;
begin
  Bmp := TBitmap.Create;
  Bmp.PixelFormat := pf32bit;
  Handle := Browser.Host.WindowHandle;
  ShowWindow(handle, SW_RESTORE); // will work only if this is used otherwise black image!
  BarLeft := GetSystemMetrics(SM_CXFRAME);
  BarHeight := GetSystemMetrics(SM_CYCAPTION) + GetSystemMetrics(SM_CYFRAME);
  GetWindowRect(Handle, Rect);
  DC := GetDC(Handle);
  Bmp.Width := Rect.Right - Rect.Left;
  Bmp.Height := (Rect.Bottom - Rect.Top);
  BitBlt(Bmp.Canvas.Handle, 0, 0, Bmp.Width, Bmp.Height, DC, -BarLeft, -BarHeight, SRCCOPY);
  ReleaseDC(Handle, DC);
  Bmp.SaveToFile('c:\test.bmp');
  Bmp.Free;
end;