你可以捕获屏幕的位图存储器中:
/// <summary>
/// Saves a picture of the screen to a bitmap image.
/// </summary>
/// <returns>The saved bitmap.</returns>
private Bitmap CaptureScreenShot()
{
// get the bounding area of the screen containing (0,0)
// remember in a multidisplay environment you don't know which display holds this point
Rectangle bounds = Screen.GetBounds(Point.Empty);
// create the bitmap to copy the screen shot to
Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height);
// now copy the screen image to the graphics device from the bitmap
using (Graphics gr = Graphics.FromImage(bitmap))
{
gr.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
}
return bitmap;
}
再取图像的一部分可能通过50像素的矩形一个50像素在鼠标位置为中心:
portionOf = bitmap.Clone(new Rectangle(pointer.X - 25, pointer.Y - 25, 50, 50), PixelFormat.Format32bppRgb);
而以中心在鼠标位置的100px×100px的矩形显示它。这会给你一个2倍的缩放级别。 (显示尺寸)/(拍摄尺寸)的比率越大,放大得越多。一些沿线的:
[DllImport("User32.dll")]
public static extern IntPtr GetDC(IntPtr hwnd);
[DllImport("User32.dll")]
public static extern void ReleaseDC(IntPtr hwnd, IntPtr dc);
void OnPaint()
{
IntPtr desktopDC = GetDC(IntPtr.Zero); // Get the full screen DC
Graphics g = Graphics.FromHdc(desktopDC); // Get the full screen GFX device
g.DrawImage(portionOf, pointer.X - 50, pointer.Y - 50, 100, 100); // Render the image
// Clean up
g.Dispose();
ReleaseDC(IntPtr.Zero, desktopDC);
}
如果您最初的问题未能生成响应,您应该编辑它而不是发布一个新的。 – 2012-08-16 20:20:43