C#对被遮挡的窗体进行截图
C#对被遮挡的窗体进行截图
最近在做的一个项目,用的地图控件比较特殊,
在地图上面自己绘制的东东没办法随地图一起导出成图片
只能绕个弯,用截屏的方式了
一开始用的是这样:
- /// <summary>
- /// 截图
- /// </summary>
- /// <returns></returns>
- private Image CaptureScreen()
- {
- Image MyImage = null;
- //获得当前地图控件的大小
- Graphics grapScreen = m_pFremework.Hook.CreateGraphics();
- //Rectangle rect = new Rectangle();
- //rect = Screen.GetWorkingArea(m_pFremework.Hook);//范围不准确,直接使用控件的属性
- Rectangle rect = new Rectangle(0, 0, m_pFremework.Hook.Width, m_pFremework.Hook.Height);
- MyImage = new Bitmap(rect.Width, rect.Height, grapScreen);
- Graphics grapImage = Graphics.FromImage(MyImage);
- IntPtr dc1 = grapScreen.GetHdc();
- IntPtr dc2 = grapImage.GetHdc();
- BitBlt(dc2, 0, 0, rect.Width, rect.Height, dc1, 0, 0, 13369376);
- //释放掉DC
- grapScreen.ReleaseHdc(dc1);
- grapImage.ReleaseHdc(dc2);
- return MyImage;
- }
这个函数在win7中没有任何问题,但在xp中发现,任何遮挡到地图控件的窗体都被截下来了
网上搜搜,发现了一个PrintWindow API可以解决这个问题,用下来发现这个只能截整个窗体,
无法单独截取地图控件,这个就简单了,直接使用BitMap的Clone函数裁剪出来地图控件部分就搞定了,
代码是这个样子:
- private Image CaptureScreen2()
- {
- Image MyImage = null;
- IntPtr hdc = GetWindowDC(m_pFremework.MdiForm.Handle);
- LPPOINT lphook = new LPPOINT();
- lphook.x = 0;
- lphook.y = 0;
- ClientToScreen(m_pFremework.Hook.Handle, ref lphook);
- ScreenToClient(m_pFremework.MdiForm.Handle, ref lphook);
- Rectangle rect = new Rectangle(lphook.x, lphook.y, m_pFremework.Hook.Width, m_pFremework.Hook.Height);
- if (hdc != IntPtr.Zero)
- {
- IntPtr hdcMem = CreateCompatibleDC(hdc);
- if (hdcMem != IntPtr.Zero)
- {
- IntPtr hbitmap = CreateCompatibleBitmap(hdc, m_pFremework.MdiForm.Width, m_pFremework.MdiForm.Height);
- if (hbitmap != IntPtr.Zero)
- {
- IntPtr ip = SelectObject(hdcMem, hbitmap);
- if (ip != IntPtr.Zero)
- {
- bool a = PrintWindow(m_pFremework.MdiForm.Handle, hdcMem, 1);
- DeleteObject(hbitmap);
- Image tempImg = Image.FromHbitmap(hbitmap);
- Bitmap b = new Bitmap(tempImg);
- MyImage = b.Clone(rect, b.PixelFormat);
- }
- }
- }
- }
- return MyImage;
- }
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