如何实现和QQ里面一样的截屏功能啊？

Question

参看以下帖子：http://expert.csdn.net/Expert/topic/2854/2854751.xml

Answer 1

获取桌面窗口的HDC句柄, 计算出鼠标拖动的矩形的位置,大小,调用BitBlt函数截屏.private Bitmap GetDesktopBitmap()
{
int Start = Environment.TickCount; Size DesktopBitmapSize = GetDesktopBitmapSize(); Graphics Graphic = Graphics.FromHwnd(GetDesktopWindow()); int GraphicsFromHwndTime = Environment.TickCount - Start;
Start = Environment.TickCount; Bitmap MemImage = new Bitmap(DesktopBitmapSize.Width, DesktopBitmapSize.Height, Graphic); int MemImageTime = Environment.TickCount - Start;
Start = Environment.TickCount; Graphics MemGraphic = Graphics.FromImage(MemImage); int FromImageTime = Environment.TickCount - Start; IntPtr dc1 = Graphic.GetHdc();
IntPtr dc2 = MemGraphic.GetHdc();
BitBlt(dc2, 0, 0, DesktopBitmapSize.Width, DesktopBitmapSize.Height, dc1, 0, 0, SRCCOPY); int BitBltTime = Environment.TickCount - Start; Graphic.ReleaseHdc(dc1);
MemGraphic.ReleaseHdc(dc2);

Console.WriteLine("GraphicsFromHwndTime: " + GraphicsFromHwndTime.ToString());
Console.WriteLine("MemImageTime:         " + MemImageTime.ToString());
Console.WriteLine("FromImageTime:        " + FromImageTime.ToString());
Console.WriteLine("BitBltTime:           " + BitBltTime.ToString()); Graphic.Dispose();
MemGraphic.Dispose(); return MemImage;
}