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using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Windows.Forms; /// <summary> /// The ScreenShot. /// </summary> public static class ScreenShot { /// <summary> /// Capturing the current screen then save image to the indicated file. /// </summary> /// <param name="file"> /// The file. /// </param> public static void CaptureScreen(string file = null) { IntPtr screenHandle = WindowsAPI.GetDesktopWindow(); Capture(screenHandle, file); } /// <summary> /// Capturing the current screen working area which does not include the task bar. /// </summary> /// <param name="file"> /// The file. /// </param> public static void CaptureScreenWorkingArea(string file) { Rectangle workingArea = Screen.PrimaryScreen.WorkingArea; Capture(new Point(workingArea.X, workingArea.Y), new Point(0, 0), new Size(workingArea.Width, workingArea.Height), file); } /// <summary> /// Capture full screen. /// </summary> /// <param name="file"> /// The file. /// </param> public static void CaptureFullScreen(string file) { Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); Graphics graphics = Graphics.FromImage(bitmap); graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size); bitmap.Save(file, ImageFormat.Jpeg); } /// <summary> /// Capturing the indicated application window screen and then save image to the indicated file. If the file parameter not set, function will create a random file name by GUID under the runtime directory. /// </summary> /// <param name="handle"> Window's handle. </param> /// <param name="file"> Target image file. </param> public static void CaptureApplicationScreen(IntPtr handle, string file) { if (WindowsAPI.SetForegroundWindow(handle)) { Capture(handle, file); } } #region Helper /// <summary> /// Capture the indicated region screenshot by the indicated window. /// </summary> /// <param name="handle"> Indicated window handle. </param> /// <param name="file"> Save image file name. </param> private static void Capture(IntPtr handle, string file) { // Testing source handle. if (handle != IntPtr.Zero) { WindowsAPI.Rect srcRect; // Get the source window's information. if (WindowsAPI.GetWindowRect(handle, out srcRect)) { int width = srcRect.Right - srcRect.Left; int height = srcRect.Bottom - srcRect.Top; Capture(srcRect.Left, srcRect.Top, width, height, file); } } } /// <summary> /// Capture the screenshot by coordinate from display memory. /// </summary> /// <param name="x"> /// The x. /// </param> /// <param name="y"> /// The y. /// </param> /// <param name="width"> /// The width. /// </param> /// <param name="height"> /// The height. /// </param> /// <param name="file"> /// The file. /// </param> private static void Capture(int x, int y, int width, int height, string file) { IntPtr displayDC = IntPtr.Zero; IntPtr destinationDC = IntPtr.Zero; IntPtr bmp = IntPtr.Zero; try { displayDC = WindowsAPI.CreateDC("DISPLAY", IntPtr.Zero, IntPtr.Zero, IntPtr.Zero); if (displayDC == IntPtr.Zero) { throw new Exception("Create display DC failed!"); } destinationDC = WindowsAPI.CreateCompatibleDC(displayDC); if (destinationDC == IntPtr.Zero) { throw new Exception("Create destination DC failed!"); } bmp = WindowsAPI.CreateCompatibleBitmap(displayDC, width, height); // Select bmp into destination DC. if (WindowsAPI.SelectObject(destinationDC, bmp) == IntPtr.Zero) { throw new Exception("Select bmp into destination DC failed!"); } if (0 == WindowsAPI.BitBlt(destinationDC, 0, 0, width, height, displayDC, x, y, (uint)WindowsAPI.TernaryRasterOperations.Srccopy)) { throw new Exception("BitBlt failed!"); } Image image = Image.FromHbitmap(bmp); // Save image. if (string.IsNullOrEmpty(file)) { // Create a random file name by GUID. file = Guid.NewGuid().ToString(); } ImageHelper imageHelper = new ImageHelper(file); image.Save(imageHelper.FilePath, imageHelper.ImageCodecInfo, imageHelper.EncoderParameters); } finally { WindowsAPI.DeleteDC(displayDC); WindowsAPI.DeleteDC(destinationDC); WindowsAPI.DeleteObject(bmp); } } /// <summary> /// Capture the screenshot by point using Graphics.CopyFromScreen. /// </summary> /// <param name="source"> /// The source. /// </param> /// <param name="destination"> /// The destination. /// </param> /// <param name="size"> /// The size. /// </param> /// <param name="file"> /// The file. /// </param> private static void Capture(Point source, Point destination, Size size, string file) { Image image = new Bitmap(size.Width, size.Height); Graphics g = Graphics.FromImage(image); g.CopyFromScreen(source, destination, size); ImageHelper imgHelper = new ImageHelper(file); image.Save(imgHelper.FilePath, imgHelper.ImageCodecInfo, imgHelper.EncoderParameters); } #endregion /// <summary> /// This class includes win32 api for other class calling. /// </summary> internal static class WindowsAPI { /// <summary> /// The ternary raster operations. /// </summary> public enum TernaryRasterOperations : uint { /// <summary> /// The srccopy. /// </summary> Srccopy = 0x00CC0020, /// <summary> /// The srcpaint. /// </summary> Srcpaint = 0x00EE0086, /// <summary> /// The srcand. /// </summary> Srcand = 0x008800C6, /// <summary> /// The srcinvert. /// </summary> Srcinvert = 0x00660046, /// <summary> /// The srcerase. /// </summary> Srcerase = 0x00440328, /// <summary> /// The notsrccopy. /// </summary> Notsrccopy = 0x00330008, /// <summary> /// The notsrcerase. /// </summary> Notsrcerase = 0x001100A6, /// <summary> /// The mergecopy. /// </summary> Mergecopy = 0x00C000CA, /// <summary> /// The mergepaint. /// </summary> Mergepaint = 0x00BB0226, /// <summary> /// The patcopy. /// </summary> Patcopy = 0x00F00021, /// <summary> /// The patpaint. /// </summary> Patpaint = 0x00FB0A09, /// <summary> /// The patinvert. /// </summary> Patinvert = 0x005A0049, /// <summary> /// The dstinvert. /// </summary> Dstinvert = 0x00550009, /// <summary> /// The blackness. /// </summary> Blackness = 0x00000042, /// <summary> /// The whiteness. /// </summary> Whiteness = 0x00FF0062 } // Methods [DllImport("user32.dll")] public static extern IntPtr GetDesktopWindow(); [DllImport("gdi32.dll", SetLastError = true, ExactSpelling = true)] internal static extern int BitBlt(IntPtr destDc, int xDest, int yDest, int width, int height, IntPtr sourceDc, int xSource, int ySource, uint rasterOperation); [DllImport("gdi32.dll", SetLastError = true, ExactSpelling = true)] internal static extern IntPtr CreateCompatibleBitmap(IntPtr dc, int width, int height); [DllImport("gdi32.dll", SetLastError = true, ExactSpelling = true)] internal static extern IntPtr CreateCompatibleDC(IntPtr dc); [DllImport("gdi32.dll", EntryPoint = "CreateDCW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)] internal static extern IntPtr CreateDC(string driver, IntPtr device, IntPtr output, IntPtr devMode); [DllImport("gdi32.dll", ExactSpelling = true)] internal static extern int DeleteDC(IntPtr dc); [DllImport("gdi32.dll", ExactSpelling = true)] internal static extern int DeleteObject(IntPtr gdiObject); [DllImport("gdi32.dll", SetLastError = true, ExactSpelling = true)] internal static extern IntPtr SelectObject(IntPtr dc, IntPtr gdi); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetWindowRect(IntPtr hWnd, out Rect lpRect); [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool SetForegroundWindow(IntPtr hWnd); /// <summary> /// The rect. /// </summary> [StructLayout(LayoutKind.Sequential)] public struct Rect { /// <summary> /// The left. /// </summary> public readonly int Left; /// <summary> /// The top. /// </summary> public readonly int Top; /// <summary> /// The right. /// </summary> public readonly int Right; /// <summary> /// The bottom. /// </summary> public readonly int Bottom; } } }给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
