/// <summary>使用Graphics方式捕获桌面截图(效率低于DesktopCapture，主要用户登录界面截图)</summary>internal class GraphicCapture{private const int Desktopvertres = 117;private const int Desktophorzres = 118;/// <summary>当前最新一帧</summary>private Bitmap _currentFrame;private Rectangle _currentScreenBounds;private Graphics _graphic;private readonly object _screenLock = new object();private Bitmap _originBitmap;private bool _isManualCaptureStop;private PixelFormat _pixelFormat = PixelFormat.Bgra32;private Size DesktopSize{get{IntPtr dc = GraphicCapture.GetDC(IntPtr.Zero);int deviceCaps1 = GraphicCapture.GetDeviceCaps(dc, 117);int deviceCaps2 = GraphicCapture.GetDeviceCaps(dc, 118);GraphicCapture.ReleaseDC(IntPtr.Zero, dc);return new Size(deviceCaps2, deviceCaps1);}}[DllImport("user32.dll")]private static extern IntPtr GetDC(IntPtr ptr);[DllImport("gdi32.dll")]private static extern int GetDeviceCaps(IntPtr hdc, int nIndex);[DllImport("User32.dll")]private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);/// <summary>构造函数</summary>public GraphicCapture(){this._currentScreenBounds = this.GetScreenRectangle(Screen.PrimaryScreen);this._originBitmap = this.CreateBitmap();this._graphic = Graphics.FromImage((Image) this._originBitmap);}private Rectangle GetScreenRectangle(Screen screen){Rectangle bounds = screen.Bounds;return new Rectangle(new Point(bounds.X, bounds.Y), this.DesktopSize);}/// <summary>Bitmap转byte[]</summary>/// <param name="bitmap"></param>/// <returns></returns>private byte[] BitmapToByteArray(Bitmap bitmap){System.Drawing.Imaging.PixelFormat format = this.PixelFormatConverter(this.PixelFormat);Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);BitmapData bitmapdata = bitmap.LockBits(rect, ImageLockMode.ReadOnly, format);int length = Math.Abs(bitmapdata.Stride) * bitmap.Height;byte[] destination = new byte[length];Marshal.Copy(bitmapdata.Scan0, destination, 0, length);bitmap.UnlockBits(bitmapdata);return destination;}private Bitmap CreateBitmap(){System.Drawing.Imaging.PixelFormat pixelFormat = this.PixelFormatConverter(this.PixelFormat);Size desktopSize = this.DesktopSize;int width = desktopSize.Width;desktopSize = this.DesktopSize;int height = desktopSize.Height;int format = (int) pixelFormat;return new Bitmap(width, height, (System.Drawing.Imaging.PixelFormat) format);}private System.Drawing.Imaging.PixelFormat PixelFormatConverter(PixelFormat customPixelFormat){if (true);System.Drawing.Imaging.PixelFormat pixelFormat;if (customPixelFormat != PixelFormat.Bgra32){if (customPixelFormat != PixelFormat.Bgr24)throw new ArgumentOutOfRangeException("PixelFormat", (object) this.PixelFormat, (string) null);pixelFormat = System.Drawing.Imaging.PixelFormat.Format24bppRgb;}elsepixelFormat = System.Drawing.Imaging.PixelFormat.Format32bppArgb;if (true);return pixelFormat;}/// <summary>检索最新的桌面图像和关联的元数据</summary>private byte[] GetLatestFrameToByte() => this.BitmapToByteArray(this.GetLatestFrameToBitmap());/// <summary>检索最新的桌面图像</summary>/// <returns></returns>private Bitmap GetLatestFrameToBitmap(){lock (this._screenLock){Graphics graphic = this._graphic;int x = this._currentScreenBounds.X;int y = this._currentScreenBounds.Y;Size desktopSize = this.DesktopSize;int width1 = desktopSize.Width;desktopSize = this.DesktopSize;int height1 = desktopSize.Height;Size blockRegionSize = new Size(width1, height1);graphic.CopyFromScreen(x, y, 0, 0, blockRegionSize);Size newSize;ref Size local = ref newSize;desktopSize = this.DesktopSize;int width2 = (int) ((double) desktopSize.Width * this.Scale);desktopSize = this.DesktopSize;int height2 = (int) ((double) desktopSize.Height * this.Scale);local = new Size(width2, height2);this._currentFrame = newSize.Width == this._originBitmap.Width && newSize.Height == this._originBitmap.Height ? this._originBitmap : new Bitmap((Image) this._originBitmap, newSize);}return this._currentFrame;}/// <summary>捕获图像像素格式，默认为BGRA32</summary>public PixelFormat PixelFormat{get => this._pixelFormat;set{this._pixelFormat = value;this._originBitmap?.Dispose();this._graphic?.Dispose();this._originBitmap = this.CreateBitmap();this._graphic = Graphics.FromImage((Image) this._originBitmap);}}/// <summary>捕获图像缩放大小，默认为1.0</summary>public double Scale { get; set; } = 1.0;/// <summary>新帧捕获事件</summary>public event EventHandler<CaptureFrame> FrameArrived;/// <summary>开始捕获</summary>public void StartCapture(){this._isManualCaptureStop = false;}/// <summary>停止捕获</summary>public void StopCapture(){this._cancellationTokenSource?.Cancel();this._isManualCaptureStop = true;}/// <summary>获取下一帧图像数据</summary>/// <param name="captureFrame"></param>/// <returns></returns>public bool TryGetNextFrame(out CaptureFrame captureFrame){captureFrame = (CaptureFrame) null;if (this._isManualCaptureStop)return false;try{byte[] byteArray = this.BitmapToByteArray(this.GetLatestFrameToBitmap());Size size = new Size((int) ((double) this.DesktopSize.Width * this.Scale), (int) ((double) this.DesktopSize.Height * this.Scale));captureFrame = new CaptureFrame(size, this.PixelFormat, byteArray);return true;}catch (Exception ex){return false;}}}
操作鼠标键盘等操作可以参考本人另一篇文章：使用C#制作可以录制自动化执行Windows操作脚本工具——类似于按键精灵 - log9527 - 博客园 (cnblogs.com)
