Taking screenshot of a webpage programmatically

Question

I want to take sceenshot of a webpage programmatically given the URL as input.

And here is what I have till now:

// The size of the browser window when we want to take the screenshot (and the size of the resulting bitmap)
            Bitmap bitmap = new Bitmap(1024, 768);
            Rectangle bitmapRect = new Rectangle(0, 0, 1024, 768);
            // This is a method of the WebBrowser control, and the most important part
            webBrowser1.DrawToBitmap(bitmap, bitmapRect);

            // Generate a thumbnail of the screenshot (optional)
            System.Drawing.Image origImage = bitmap;
            System.Drawing.Image origThumbnail = new Bitmap(120, 90, origImage.PixelFormat);

            Graphics oGraphic = Graphics.FromImage(origThumbnail);
            oGraphic.CompositingQuality = CompositingQuality.HighQuality;
            oGraphic.SmoothingMode = SmoothingMode.HighQuality;
            oGraphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
            Rectangle oRectangle = new Rectangle(0, 0, 120, 90);
            oGraphic.DrawImage(origImage, oRectangle);

            // Save the file in PNG format
            origThumbnail.Save(@"d:\Screenshot.png", ImageFormat.Png);
            origImage.Dispose();

But this is not working. It is only giving me a white blank pic. What am I missing here?? :-(

Is there any other way I could get the screenshot of a web page programmatically?

Answer 1

You can try calling the native PrintWindow function.

Answer 2

Drawing the browser control to a bitmap is somewhat unreliable. I think it would be better to just screenscrape your window.

using (Bitmap bitmap = new Bitmap(bitmapSize.Width, bitmapSize.Height, PixelFormat.Format24bppRgb))
using (Graphics graphics = Graphics.FromImage(bitmap))
{
    graphics.CopyFromScreen(
        PointToScreen(webBrowser1.Location),
        new Point(0, 0), 
        bitmapSize);
        bitmap.Save(filename);
}

Answer 3

You could also try P/Invoking BitBlt() from gdi32.dll. Try this code:

Graphics mygraphics = webBrowser1.CreateGraphics();
Size s = new Size(1024, 768);
Bitmap memoryImage = new Bitmap(s.Width, s.Height, mygraphics);
Graphics memoryGraphics = Graphics.FromImage(memoryImage);
IntPtr dc1 = mygraphics.GetHdc();
IntPtr dc2 = memoryGraphics.GetHdc();
// P/Invoke call here
BitBlt(dc2, 0, 0, webBrowser1.ClientRectangle.Width, webBrowser1.ClientRectangle.Height, dc1, 0, 0, 13369376);
mygraphics.ReleaseHdc(dc1);
memoryGraphics.ReleaseHdc(dc2);
memoryImage.Save(filename);

The P/Invoke would be:

[DllImport("gdi32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool BitBlt(IntPtr hdc, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, uint dwRop);

Answer 4

well, I searched and searched and searched....and found it here

Thanks all for your replies.....

Answer 5

This question was just asked yesterday, although mainly directed at Perl. Maybe some of the answers there would help you, although would obviously take you another direction. Here's the link.