所属类别：.NET

文章作者：未知

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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 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);关闭本页

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