C:/Users/Andreas Schiffler/Desktop/SVN/NewGamePhysics/NewGamePhysics/Utilities/Screenshot.cs

// --------------------------------------------------------
// Screenshot.cs
// (A. Schiffler, 2010)
// --------------------------------------------------------

namespace NewGamePhysics.Utilities
{
    using System;
    using System.IO;
    using System.Threading;

    using Microsoft.Xna.Framework.Graphics;

    public class Screenshot
    {
        private ResolveTexture2D screenshotTexture;

        private string screenshotPath;

        private static int screenshotNumber = 0;

        private static AutoResetEvent fileSaved = new AutoResetEvent(true);
 
        public Screenshot()
        {
            screenshotPath = System.Windows.Forms.Application.StartupPath + "\\Screenshots";
            if (!System.IO.Directory.Exists(screenshotPath))
            {
                System.IO.Directory.CreateDirectory(screenshotPath);
            }
        }
 
        public void TakeScreenshot(GraphicsDevice graphiceDevice)
        {
            if (fileSaved.WaitOne(1000))
            {
                fileSaved.Reset();
                int w = graphiceDevice.PresentationParameters.BackBufferWidth;
                int h = graphiceDevice.PresentationParameters.BackBufferHeight;
                screenshotTexture = new ResolveTexture2D(graphiceDevice, w, h, 1, SurfaceFormat.Bgr32);
                graphiceDevice.ResolveBackBuffer(screenshotTexture);
                Thread newThread = new Thread(ScreenshotThread);
                newThread.Start();
            }
        }
 
        private void ScreenshotThread()
        {
            try
            {
                if (!screenshotTexture.IsDisposed)
                {
                    string filename = this.ScreenshotFilename("image");
                    screenshotTexture.Save(filename, ImageFileFormat.Png);
                    screenshotTexture.Dispose();
                }
            }
            finally
            {
                fileSaved.Set();
            }
        }

        private string ScreenshotFilename(string name)
        {
            string filename;

            do
            {
                screenshotNumber++;
                filename = String.Format(@"{0}\{1}_{2}.png", this.screenshotPath, name, screenshotNumber);
            } while (File.Exists(filename));

            return filename;
        }
    }
}

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