C# 非顶端窗口截图.docx

C#非顶端窗口截图panel上可以通过DrawToBitmap截图，不管是否在屏幕外是否有遮挡Bitmap sourceBitmap = new Bitmap(400, 300);/Control ct = frmMain.mianForm.panel1 as Control;/ct.DrawToBitmap(sourceBitmap, new System.Drawing.Rectangle(0, 0, 400, 300);panel1.DrawToBitmap(sourceBitmap, new System.Drawing.Rectangle(0, 0, 400, 300);sourceBitmap.Save(e:123form2.bmp);在图片上打水印string strpath = e:1.bmp;Bitmap bmp = new Bitmap(strpath);Graphics graphics = Graphics.FromImage(bmp);System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Red);graphics.FillEllipse(myBrush, new System.Drawing.Rectangle(150, 200, 10, 10);/画圆trybmp.Save(e:new.bmp);catch (Exception ex)MessageBox.Show(ex.Message);抓屏截图Image objImage = new Bitmap(400, 300);Graphics g = Graphics.FromImage(objImage);g.CopyFromScreen(new System.Drawing.Point(Cursor.Position.X - 150, Cursor.Position.Y - 25), new System.Drawing.Point(0, 0), new Size(400, 300);IntPtr dc1 = g.GetHdc();g.ReleaseHdc(dc1);objImage.Save(e:test.jpg);非顶端窗口截图用Windows热键截图然后保存的我就不说了,地球人都知道.如何截取非前端窗体的截图，要先获取所要截图的窗口的句柄IntPtr PicWindow = this.Handle首先说一下PrintWindow这个API的使用public static Bitmap GetWindowCapture(IntPtr hWnd)IntPtr hscrdc = GetWindowDC(hWnd);RECT windowRect = new RECT();GetWindowRect(hWnd, ref windowRect);int width = windowRect.right - windowRect.left;int height = windowRect.bottom - windowRect.top;IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, width, 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;DllImport(user32.dll)public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);DllImport(gdi32.dll)public static extern IntPtr CreateDC(string lpszDriver,/ driver name驱动名string lpszDevice,/ device name设备名string lpszOutput,/ not used; should be NULLIntPtr lpInitData/ optional printer data);DllImport(gdi32.dll)public 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UInt32 dwRop/ raster operation code光栅的操作值);DllImport(gdi32.dll)public static extern IntPtr CreateCompatibleDC(IntPtr hdc / handle to DC);DllImport(gdi32.dll)public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc,/ handle to DCint nWidth,/ width of bitmap, in pixelsint nHeight/ height of bitmap, in pixels);DllImport(gdi32.dll)public static extern IntPtr SelectObject(IntPtr hdc,/ handle to DCIntPtr hgdiobj/ handle to object);DllImport(gdi32.dll)public static extern int DeleteDC(IntPtr hdc/ handle to DC);DllImport(user32.dll)public static extern bool PrintWindow(IntPtr hwnd,/ Window to copy,Handle to the window that will be copied.IntPtr hdcBlt,/ HDC to print into,Handle to the device context.UInt32 nFlags/ Optional flags,Specifies the drawing options. It can be one of the following values.);DllImport(user32.dll)public static extern IntPtr GetWindowDC(IntPtr hwnd);很遗憾,上面的确可以截取非前端窗体的截图,但是非GDI的程序是无法截图的比如DirectX下面说一下BitBlt这个API的使用/ / 提供全屏和指定窗口的截图 以及保存为文件的类/ public class ScreenCapture/ / 全屏截图/ / public Image CaptureScreen()return CaptureWindow(User32.GetDesktopWindow();/ / 指定窗口截图/ / 窗口句柄. (在windows应用程序中, 从Handle属性获得)/ public Image CaptureWindow(IntPtr handle)IntPtr hdcSrc = User32.GetWindowDC(handle);User32.RECT windowRect = new User32.RECT();User32.GetWindowRect(handle, ref windowRect);int width = windowRect.right - windowRect.left;int height = windowRect.bottom - windowRect.top;IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, width, height);IntPtr hOld = GDI32.SelectObject(hdcDest, hBitmap);GDI32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32.SRCCOPY);GDI32.SelectObject(hdcDest, hOld);GDI32.DeleteDC(hdcDest);User32.ReleaseDC(handle, hdcSrc);Image img = Image.FromHbitmap(hBitmap);GDI32.DeleteObject(hBitmap);return img;/ / 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);/ / 辅助类 定义 Gdi32 API 函数/ private class GDI32public const int SRCCOPY = 0x00CC0020;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 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);/ / 辅助类 定义User32 API函数/ private class User32StructLayout(LayoutKind.Sequential)public struct RECTpublic 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);上面的类 使用了BitBlt这个API可以截取GDI或者非GDI图形 只不过,非前端窗体图形不能截获.下面说一下不使用API 最简单的全屏截图方案public static Bitmap CopyPrimaryScreen()Screen s = Screen.PrimaryScreen;Rectangle r = s.Bounds;int w = r.Width;int h = r.Height;Bitmap bmp = new Bitmap(w, h);Graphics g = Graphics.FromImage(bmp);g.CopyFromScreen(new Point(0, 0),new Point(0, 0),new Size(w, h);return bmp;最后,试试下面这个办法:只要窗体的visable为true，即使它在屏幕的外面也可以抓到图。如果为false，就是一张黑图了，赫赫。public 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;API声明DllImport(gdi32.dll)public static extern IntPtr CreateDC(string lpszDriver,/ driver name驱动名string lpszDevice,/ device name设备名string lpszOutput,/ not used; should be NULLIntPtr lpInitData/ optional printer data);DllImport(gdi32.dll)public 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UInt32 dwRop/ raster operation code光栅的操作值);DllImport(gdi32.dll)public