using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.Runtime.InteropServices;using System.Text;using System.Windows.Forms;namespace GetFormDemo.Comm{ public struct RECT { public int x1; public int y1; public int x2; public int y2; } class ScreenCapture { [DllImport("user32.dll")] private static extern IntPtr GetDC(IntPtr hwnd); [DllImport("user32.dll")] private static extern IntPtr ReleaseDC(IntPtr hc, IntPtr hDest); [DllImport("user32.dll")] private static extern IntPtr GetWindowDC(IntPtr hwnd); [DllImport("user32.dll")] private static extern IntPtr GetForegroundWindow(); [DllImport("user32.dll")] private static extern IntPtr GetWindowRect(IntPtr hWnd, out RECT rect); [DllImport("user32.dll")] private static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags); [DllImport("user32.dll")] private static extern IntPtr GetDesktopWindow(); [DllImport("gdi32.dll")] private static extern IntPtr CreateDC( string lpszDriver, // driver name驱动名 string lpszDevice, // device name设备名 string lpszOutput, // not used; should be NULL IntPtr lpInitData // optional printer data ); [DllImport("gdi32.dll")] private static extern int BitBlt( IntPtr hdcDest, // handle to destination DC目标设备的句柄 int nXDest, // x-coord of destination upper-left corner目标对象的左上角的X坐标 int nYDest, // y-coord of destination upper-left corner目标对象的左上角的Y坐标 int nWidth, // width of destination rectangle目标对象的矩形宽度 int nHeight, // height of destination rectangle目标对象的矩形长度 IntPtr hdcSrc, // handle to source DC源设备的句柄 int nXSrc, // x-coordinate of source upper-left corner源对象的左上角的X坐标 int nYSrc, // y-coordinate of source upper-left corner源对象的左上角的Y坐标 CopyPixelOperation dwRop // raster operation code光栅的操作值 ); //static extern int BitBlt(IntPtr hdcDest, int xDest, int yDest, int //wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop); [DllImport("gdi32.dll")] private static extern IntPtr CreateCompatibleDC( IntPtr hdc // handle to DC ); [DllImport("gdi32.dll")] private static extern IntPtr CreateCompatibleBitmap( IntPtr hdc, // handle to DC int nWidth, // width of bitmap, in pixels int nHeight // height of bitmap, in pixels ); [DllImport("gdi32.dll")] private static extern IntPtr SelectObject( IntPtr hdc, // handle to DC IntPtr hgdiobj // handle to object ); [DllImport("gdi32.dll")] private static extern int DeleteDC( IntPtr hdc // handle to DC ); /// /// 抓取屏幕(层叠的窗口) /// /// 左上角的横坐标 /// 左上角的纵坐标 /// 抓取宽度 /// 抓取高度 /// public Bitmap CaptureScreen(int x, int y, int width, int height) { Bitmap bmp = new Bitmap(width, height); using (Graphics g = Graphics.FromImage(bmp)) { g.CopyFromScreen(new Point(x, y), new Point(0, 0), bmp.Size); g.Dispose(); } //bit.Save(@"capture2.png"); return bmp; } /// /// 抓取整个屏幕 /// /// public Bitmap CaptureScreen() { Size screenSize = Screen.PrimaryScreen.Bounds.Size; return CaptureScreen(0, 0, screenSize.Width, screenSize.Height); } /// /// 全屏截图 /// /// public Image CaptureScreenI() { return CaptureWindow(GetDesktopWindow()); } /// /// 全屏指定区域截图 /// /// public Image CaptureScreenI(RECT rect) { return CaptureWindow(GetDesktopWindow(), rect); } /// /// 指定窗口截图 /// /// 窗口句柄. (在windows应用程序中, 从Handle属性获得) /// public Bitmap CaptureWindow(IntPtr hWnd) { IntPtr hscrdc = GetWindowDC(hWnd); RECT rect = new RECT(); return CaptureWindow(hWnd, rect); } /// /// 指定窗口区域截图 /// /// 窗口句柄. (在windows应用程序中, 从Handle属性获得) /// 窗口中的一个区域 /// public Bitmap CaptureWindow(IntPtr hWnd, RECT rect) { // 获取设备上下文环境句柄 IntPtr hscrdc = GetWindowDC(hWnd); // 创建一个与指定设备兼容的内存设备上下文环境（DC） IntPtr hmemdc = CreateCompatibleDC(hscrdc); IntPtr myMemdc = CreateCompatibleDC(hscrdc); // 返回指定窗体的矩形尺寸 RECT rect1; GetWindowRect(hWnd, out rect1); // 返回指定设备环境句柄对应的位图区域句柄 IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, rect1.x2 - rect1.x1, rect1.y2 - rect1.y1); IntPtr myBitmap = CreateCompatibleBitmap(hscrdc, rect.x2 - rect.x1, rect.y2 - rect.y1); //把位图选进内存DC // IntPtr OldBitmap = (IntPtr)SelectObject(hmemdc, hbitmap); SelectObject(hmemdc, hbitmap); SelectObject(myMemdc, myBitmap); ///// // // 下面开始所谓的作画过程，此过程可以用的方法很多，看你怎么调用 API 了 // ///// // 直接打印窗体到画布 PrintWindow(hWnd, hmemdc, 0); // IntPtr hw = GetDesktopWindow(); // IntPtr hmemdcClone = GetWindowDC(myBitmap); BitBlt(myMemdc, 0, 0, rect.x2 - rect.x1, rect.y2 - rect.y1, hmemdc, rect.x1, rect.y1, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt); //SelectObject(myMemdc, myBitmap); Bitmap bmp = Bitmap.FromHbitmap(myBitmap); DeleteDC(hscrdc); DeleteDC(hmemdc); DeleteDC(myMemdc); return bmp; } /// /// 指定窗口截图 保存为图片文件 /// /// /// /// public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format) { Image img = CaptureWindow(handle); img.Save(filename, format); } /// /// 全屏截图 保存为文件 /// /// /// public void CaptureScreenToFile(string filename, ImageFormat format) { Image img = CaptureScreen(); img.Save(filename, format); } /// /// 设置 RECT 的左下右上 /// /// 给出要设定的 RECT /// 左边 /// 下边 /// 右边 /// 上边 public void SetRECT(ref RECT rect, int x1, int y1, int x2, int y2) { rect.x1 = x1; rect.y1 = y1; rect.x2 = x2; rect.y2 = y2; } /// /// 合并图片 /// /// 图片1 /// 图片2 public Bitmap HBpic(Bitmap bmp1, Bitmap bmp2) { Bitmap newBmp = new Bitmap(bmp1.Width, bmp1.Height + bmp2.Height); var g = Graphics.FromImage(newBmp); g.DrawImage(bmp1, 0, 0); g.DrawImage(bmp2, 0, bmp1.Height); return newBmp; } }}