ImageFileName = "C:\Users\ab\Desktop\2.jpg"
	SaveFormat = (DotNetClass "System.Drawing.Imaging.ImageFormat").jpeg  --有png bmp gif icon tiff jpeg 等等常用格式
	start_posX=-1157
	start_posY=288
	picwidth=800
	picheight=400
	leftright_offset=0
	updown_offset=0

	ScreenBitmap = dotnetobject "System.Drawing.Bitmap" picwidth picheight (dotnetclass "System.Drawing.Imaging.PixelFormat").Format32bppPArgb
	
	Graphics = (dotnetclass "System.Drawing.Graphics").FromImage ScreenBitmap
	
	
	Graphics.CopyFromScreen  start_posX start_posY leftright_offset updown_offset ScreenBitmap.Size (dotnetclass "System.Drawing.CopyPixelOperation").SourceCopy
	

	ScreenBitmap.Save ImageFileName SaveFormat