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截取控件、窗体图片
using System; using System.Collections.Generic; using System.Drawing; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace LC { class ScreenCapture { #region 抓取屏幕 /// <summary> /// 抓取屏幕(层叠的窗口) /// </summary> /// <param name="x">左上角的横坐标</param> /// <param name="y">左上角的纵坐标</param> /// <param name="width">抓取宽度</param> /// <param name="height">抓取高度</param> /// <returns></returns> public static 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; } /// <summary> /// 抓取整个屏幕 /// </summary> /// <returns></returns> public static Bitmap captureScreen() { Size screenSize = Screen.PrimaryScreen.Bounds.Size; return captureScreen(0,0,screenSize.Width,screenSize.Height); } #endregion #region 使用BitBlt方法抓取控件，无论控件是否被遮挡 /// <summary> /// 控件(窗口)的截图，控件被其他窗口(而非本窗口内控件)遮挡时也可以正确截图，使用BitBlt方法 /// </summary> /// <param name="control">需要被截图的控件</param> /// <returns>该控件的截图，控件被遮挡时也可以正确 截图 </returns> public static Bitmap captureControl(Control control) { //调用API截屏 IntPtr hSrce = GetWindowDC(control.Handle); IntPtr hDest = CreateCompatibleDC(hSrce); IntPtr hBmp = CreateCompatibleBitmap(hSrce, control.Width, control.Height); IntPtr hOldBmp = SelectObject(hDest, hBmp); if (BitBlt(hDest, 0, 0, control.Width, control.Height, hSrce, 0, 0, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt)) { Bitmap bmp = Image.FromHbitmap(hBmp); SelectObject(hDest, hOldBmp); DeleteObject(hBmp); DeleteDC(hDest); ReleaseDC(control.Handle, hSrce); // bmp.Save(@"a.png"); // bmp.Dispose(); return bmp; } return null; } // /// <summary> // /// 有问题！！！！！用户区域坐标不对啊 // /// 控件(窗口)的用户区域截图，控件被其他窗口(而非本窗口内控件)遮挡时也可以正确截图，使用BitBlt方法 // /// </summary> // /// <param name="control">需要被截图的控件</param> // /// <returns>控件(窗口)的用户区域截图</returns> // public static Bitmap captureClientArea(Control control) // { // // Size sz = control.Size; // Rectangle rect = control.ClientRectangle; // // // //调用API截屏 // IntPtr hSrce = GetWindowDC(control.Handle); // IntPtr hDest = CreateCompatibleDC(hSrce); // IntPtr hBmp = CreateCompatibleBitmap(hSrce, rect.Width, rect.Height); // IntPtr hOldBmp = SelectObject(hDest, hBmp); // if (BitBlt(hDest, 0, 0, rect.Width, rect.Height, hSrce, rect.X, rect.Y, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt)) // { // Bitmap bmp = Image.FromHbitmap(hBmp); // SelectObject(hDest, hOldBmp); // DeleteObject(hBmp); // DeleteDC(hDest); // ReleaseDC(control.Handle, hSrce); // // bmp.Save(@"a.png"); // // bmp.Dispose(); // return bmp; // } // return null; // // } #endregion #region 使用PrintWindow方法抓取窗口，无论控件是否被遮挡 /// <summary> /// 窗口的 截图 ，窗口被遮挡时也可以正确截图，使用PrintWindow方法 /// </summary> /// <param name="control">需要被截图的窗口</param> /// <returns>窗口的截图，控件被遮挡时也可以正确截图</returns> public static Bitmap captureWindowUsingPrintWindow(Form form) { return GetWindow(form.Handle); } private static Bitmap GetWindow(IntPtr hWnd) { IntPtr hscrdc = GetWindowDC(hWnd); Control control = Control.FromHandle(hWnd); IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, control.Width, control.Height); IntPtr hmemdc = CreateCompatibleDC(hscrdc); SelectObject(hmemdc, hbitmap); PrintWindow(hWnd, hmemdc, 0); Bitmap bmp = Bitmap.FromHbitmap(hbitmap); DeleteDC(hscrdc);//删除用过的对象 DeleteDC(hmemdc);//删除用过的对象 return bmp; } #endregion #region DLL calls [DllImport("gdi32.dll")] static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop); [DllImport("gdi32.dll")] static extern IntPtr DeleteDC(IntPtr hDc); [DllImport("gdi32.dll")] static extern IntPtr DeleteObject(IntPtr hDc); [DllImport("gdi32.dll")] static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight); [DllImport("gdi32.dll")] static extern IntPtr CreateCompatibleDC(IntPtr hdc); [DllImport("gdi32.dll")] static extern IntPtr SelectObject(IntPtr hdc, IntPtr bmp); [DllImport("user32.dll")] public static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll")] public static extern IntPtr GetWindowDC(IntPtr ptr); [DllImport("user32.dll")] public static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags); [DllImport("user32.dll")] static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDc); #endregion } } |
原文：http://cherishlc.iteye.com/blog/1687738
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