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GdPictureImaging.TwainGetOrientation Method
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Asks to the opened source which edge of the “paper” the image’s “top” is aligned with. 

This information is used to adjust the frames to match the scanning orientation of the paper.

C#
public TwainOrientation TwainGetOrientation();
Visual Basic
Public Function TwainGetOrientation() As TwainOrientation
Returns

The image orientation mode. A member of the TwainOrientation enumeration.

Remarks

Before using this function check that the TWAIN state is TWAIN_SOURCE_OPEN (4) 

To get the TWAIN state, use the TwainGetState() function.

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