方法一：WINDOWS API画法
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//获取要绘制的控件句柄
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Image img = GetWindow(this.tabPage12.Handle);
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//在母容器上创建图形对象
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Graphics gOut = mOut.pnlOut.CreateGraphics();
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//在指定位置按指定大小绘出image
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gOut.DrawImage((Image)img, form1.pnlImage.DisplayRectangle, this.tabPage12.DisplayRectangle, GraphicsUnit.Pixel);
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//释放图形对象所有资源
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gOut.Dispose();
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img.Dispose();
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GC.Collect();
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form1.pnlImage.BringToFront();
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#region 截图函数
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[DllImport("gdi32.dll")]
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public static extern IntPtr CreateDC(
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string lpszDriver, // driver name驱动名
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string lpszDevice, // device name设备名
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string lpszOutput, // not used; should be NULL
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IntPtr lpInitData // optional printer data
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);
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[DllImport("gdi32.dll")]
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public static extern int BitBlt(
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IntPtr hdcDest, // handle to destination DC目标设备的句柄
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int nXDest, // x-coord of destination upper-left corner目标对象的左上角的X坐标
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int nYDest, // y-coord of destination upper-left corner目标对象的左上角的Y坐标
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int nWidth, // width of destination rectangle目标对象的矩形宽度
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int nHeight, // height of destination rectangle目标对象的矩形长度
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IntPtr hdcSrc, // handle to source DC源设备的句柄
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int nXSrc, // x-coordinate of source upper-left corner源对象的左上角的X坐标
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int nYSrc, // y-coordinate of source upper-left corner源对象的左上角的Y坐标
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UInt32 dwRop // raster operation code光栅的操作值
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);
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[DllImport("gdi32.dll")]
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public static extern IntPtr CreateCompatibleDC(
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IntPtr hdc // handle to DC
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);
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[DllImport("gdi32.dll")]
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public static extern IntPtr CreateCompatibleBitmap(
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IntPtr hdc, // handle to DC
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int nWidth, // width of bitmap, in pixels
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int nHeight // height of bitmap, in pixels
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);
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[DllImport("gdi32.dll")]
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public static extern IntPtr SelectObject(
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IntPtr hdc, // handle to DC
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IntPtr hgdiobj // handle to object
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);
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[DllImport("gdi32.dll")]
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public static extern int DeleteDC(
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IntPtr hdc // handle to DC
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);
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[DllImport("user32.dll")]
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public static extern bool PrintWindow(
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IntPtr hwnd, // Window to copy,Handle to the window that will be copied.
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IntPtr hdcBlt, // HDC to print into,Handle to the device context.
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UInt32 nFlags // Optional flags,Specifies the drawing options. It can be one of the following values.
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);
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[DllImport("user32.dll")]
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public static extern IntPtr GetWindowDC(
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IntPtr hwnd
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);
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public Bitmap GetWindow(IntPtr hWnd)
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{
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IntPtr hscrdc = GetWindowDC(hWnd);
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Control control = Control.FromHandle(hWnd);
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IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, control.Width, control.Height);
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IntPtr hmemdc = CreateCompatibleDC(hscrdc);
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SelectObject(hmemdc, hbitmap);
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PrintWindow(hWnd, hmemdc, 0);
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Bitmap bmp = Bitmap.FromHbitmap(hbitmap);
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DeleteDC(hscrdc);//删除用过的对象
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DeleteDC(hmemdc);//删除用过的对象
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return bmp;
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}
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#endregion
方法二、给background赋值
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Bitmap bmp = new Bitmap(this.tabPage12.Width, this.tabPage12.Height);
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//将控件区域显呈到指定位图
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this.tabPage12.DrawToBitmap(bmp, this.tabPage12.DisplayRectangle);
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form1.pnlImage.BackgroundImage = (Image)bmp;
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/* 分屏显示座席 */
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form1.pnlImage.BackColor = Color.White;
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form1.pnlImage.BringToFront();
方法三、将某个屏幕位置拷贝到image
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Image img = new Bitmap(tabPage13.Width, tabPage13.Height);
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Graphics g = Graphics.FromImage(img);
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g.CopyFromScreen(Obj.PointToScreen(Point.Empty), Point.Empty, tabPage13.Size);
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IntPtr dc1 = g.GetHdc();
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g.ReleaseHdc(dc1);
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form1.pnlImage.BackgroundImage = img;
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form1.pnlImage.BringToFront();
给窗体中控件绘图的几种方法
原文：http://blog.chinaunix.net/uid-25498312-id-4601214.html
