TwainSetImageLayout: TWCC_BADPROTOCOL

[ctn]

Hi

I m using plustek OpticSlim500 scanner and sometimes I do get this during TwainSetImageLayout.

This is my error message:

scanningSetRegion(left=0, top=0, right=8.26, bottom=11.69): default scan region (inches) could not be set: defaultLeft=0, defaultTop=0, defaultRight=8.5, defaultBottom=5.509994. TwainGetLastResultCode=TWRC_FAILURE, TwainGetState()=TWAIN_TRANSFER_READY, TwainGetLastConditionCode=TWCC_BADPROTOCOL

My code look like:

Code: Select all

public void scanningSetRegion(double left, double top, double right, double bottom)
{
	...
	...
	
	if((left < right) && (top < bottom))
	{
		if(_gdTwain.TwainSetImageLayout(left, top, right, bottom))
		{
			_logger.logDebug("scanningSetRegion(left={0}, top={1}, right={2}, bottom={3}): set region has been done.", left, top, right, bottom);
			_regionLeft = left;
			_regionTop = top;
			_regionRight = right;
			_regionBottom = bottom;
		}
		else
		{
			_logger.logWarning("scanningSetRegion(left={0}, top={1}, right={2}, bottom={3}): set default region has been done.", left, top, right, bottom);
			if(!_gdTwain.TwainSetImageLayout(_defaultRegionLeft, _defaultRegionTop, _defaultRegionRight, _defaultRegionBottom))
			{
				TwainResultCode twainResultCode = _gdTwain.TwainGetLastResultCode();
				TwainStatus twainStatus = _gdTwain.TwainGetState();
				TwainConditionCode twainConditionCode = _gdTwain.TwainGetLastConditionCode();

				_logger.logWarning("scanningSetRegion(left={0}, top={1}, right={2}, bottom={3}): default scan region (inches) could not be set:  defaultLeft={4}, defaultTop={5}, defaultRight={6}, defaultBottom={7}. TwainGetLastResultCode={8}, TwainGetState()={9}, TwainGetLastConditionCode={10}", left, top, right, bottom, _defaultRegionLeft, _defaultRegionTop, _defaultRegionRight, _defaultRegionBottom, twainResultCode, twainStatus, twainConditionCode);
			}
		}
	}
	else
	{
		// throw new Exception
	}
	...
	...
}

Normally I got this error after calling scanningSetRegion a 2nd time. This just happened after calling _gdTwain.TwainAcquireToGdPictureImage(0) if I call scanningSetRegion before acquire the image I won't get any error.

Could you please help?
Thanks
Br, ctn

[Loïc]

Hi,

From the reference guide:

Before using this function check that the TWAIN state is 4 (TWAIN_SOURCE_OPEN)
To get the TWAIN state, use the TwainGetState() function.

Are you in state 4 ?

Kind regards,

Loïc

[ctn]

Hi

Thanks. The issue has been solved.
Br, ctn