Alex Mogurenko`s Blog

After i added functionality to draw target/rectangle on preview, i received some emails with question how to grab part that exactly in rectagnle.
Ok you dont need anything special and any lib, for example you draw target with

Rect _rect

then to grab that part you need:
1. Grab full image

Bitmap bmp = new Bitmap(width, height);
System.Drawing.Imaging.BitmapData data = bmp.LockBits(new […]

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Made some changes in samplegrabber and IGetFrame interface now you can define target position and target type, so new IGetFrame:

[ComVisible(true), ComImport,
Guid("2B21644A-D405-4E27-A51C-A4812bE0CE4C"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IGetFrame
{
[PreserveSig]
int getFrame(IntPtr pBuff);

[PreserveSig]
int getSize([Out] out long size);

[PreserveSig]
int getFrameParams(
[Out] out int width,
[Out] out int height,
[Out] out RawFrameFormat format);

[PreserveSig]
int drawText(
[In] IntPtr ptr,
[In] int height,
[In] int width);

[PreserveSig]
int stopDraw();

[PreserveSig]
int getGrayScale(IntPtr ptr);

[PreserveSig]
int getRgb(IntPtr ptr);

[PreserveSig]
int drawTarget(Rect rect, int type);

[PreserveSig]
int […]

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