捕获表单的一部分的屏幕截图？

我目前有一个winform，在运行时，我需要截取它的一部分并将其保存为图像。 特别是，我想要一个名为“panel1”的面板的屏幕截图。 我已经能够找到有关如何获取整个webforms或整个屏幕的屏幕截图的信息……但是我很难找到关于获取屏幕的一部分的信息。

有没有人有任何可以指出我正确方向的信息？ 即使MSDN网站上我应该寻找的文档名称也将是一个巨大的帮助！ 谢谢！

Answer 1

Panel派生的Control类有一个DrawToBitmap()方法。 你可以使用它。

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.drawtobitmap.aspx

Answer 2

查看Graphics.CopyFromScreen的文档。 你传递了2套X / Y坐标 – 屏幕上的坐标和位图中的坐标。

Answer 3

  #region - Capture & Graphic API - #region GDI32 public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter [DllImport("gdi32.dll")] public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjectSource, int nXSrc, int nYSrc, int dwRop); [DllImport("gdi32.dll")] public static extern bool StretchBlt( IntPtr hdcDest, // handle to destination DC int nXOriginDest, // x-coord of destination upper-left corner int nYOriginDest, // y-coord of destination upper-left corner int nWidthDest, // width of destination rectangle int nHeightDest, // height of destination rectangle IntPtr hdcSrc, // handle to source DC int nXOriginSrc, // x-coord of source upper-left corner int nYOriginSrc, // y-coord of source upper-left corner int nWidthSrc, // width of source rectangle int nHeightSrc, // height of source rectangle int dwRop // raster operation code ); [DllImport("gdi32.dll")] public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth, int nHeight); [DllImport("gdi32.dll")] public static extern IntPtr CreateCompatibleDC(IntPtr hDC); [DllImport("gdi32.dll")] public static extern bool DeleteDC(IntPtr hDC); [DllImport("gdi32.dll")] public static extern bool DeleteObject(IntPtr hObject); [DllImport("gdi32.dll")] public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject); #endregion #region - USER32 - [StructLayout(LayoutKind.Sequential)] public struct RECT { public int left; public int top; public int right; public int bottom; } [DllImport("user32.dll")] public static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll")] public static extern IntPtr GetWindowDC(IntPtr hWnd); [DllImport("user32.dll")] public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC); [DllImport("user32.dll")] public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect); #endregion #endregion private void run_test() { Rectangle rc = new Rectangle(); Image img = ScreenToImage(ref rc, false); img.Save(filename, System.Drawing.Imaging.ImageFormat.Jpeg); img.Dispose(); } private Image ScreenToImage(ref Rectangle rcDest, bool IsPapaer) { IntPtr handle = this.Handle; //this.Handle // get te hDC of the target window IntPtr hdcSrc = GetWindowDC(handle); // get the size RECT windowRect = new RECT(); GetWindowRect(handle, ref windowRect); int nWidth = windowRect.right - windowRect.left; int nHeight = windowRect.bottom - windowRect.top; if (IsPapaer) { float fRate = (float)rcDest.Width/nWidth; //float fHeight = nHeight * fRate; //rcDest.Height = (int)(nHeight * fRate); //rcDest.Width = (int)(rcDest.Width);// * fRate); rcDest.X = 0; rcDest.Y = 0; rcDest.Height = (int)(nHeight * fRate); //rcDest.Width = (int)(nWidth * fRate); } else { rcDest.X = 0; rcDest.Y = 0; rcDest.Height = nHeight; rcDest.Width = nWidth; } // create a device context we can copy to IntPtr hdcDest = CreateCompatibleDC(hdcSrc); // create a bitmap we can copy it to, // using GetDeviceCaps to get the width/height IntPtr hBitmap = CreateCompatibleBitmap(hdcSrc, rcDest.Width, rcDest.Height); // select the bitmap object IntPtr hOld = SelectObject(hdcDest, hBitmap); // bitblt over StretchBlt(hdcDest, rcDest.X, rcDest.Y, rcDest.Width, rcDest.Height, hdcSrc, 0, 0, nWidth, nHeight, SRCCOPY); // restore selection SelectObject(hdcDest, hOld); // clean up DeleteDC(hdcDest); ReleaseDC(handle, hdcSrc); // get a .NET image object for it Image img = Image.FromHbitmap(hBitmap); // free up the Bitmap object DeleteObject(hBitmap); return img; }