Feeder loaded gives wrong value

Thank you for your inputs.

We tried to identify if paper is vailable in the document feeder with the help of "CAP_FEEDERLOADED" .We found that though the feeder is empty, the value returned is TRUE .
Please let us know if there are any prerequisites to get this capability value.

Please find the below code
TW_CAPABILITY twCap;
L_BOOL bEnable;
L_TwainStartCapsNeg(m_hSession);
L_INT nRet;

twCap.Cap = CAP_FEEDERLOADED;
twCap.ConType = TWON_ONEVALUE;
twCap.hContainer = GlobalAlloc(GHND, sizeof(TW_ONEVALUE));

pTW_ONEVALUE pOneValue = (pTW_ONEVALUE)GlobalLock(twCap.hContainer);


pOneValue->ItemType = TWTY_BOOL;
pOneValue->Item = (TW_UINT32)bEnable;

GlobalUnlock(twCap.hContainer);

nRet = L_TwainGetCapability(m_hSession, &twCap, LTWAIN_CAPABILITY_GETVALUES);
if (nRet == TWAIN_SUCCESS)
{
// check if the selected driver supports duplex capability
pOneValue = (pTW_ONEVALUE)GlobalLock(twCap.hContainer);
bEnable = pOneValue->Item;
if(FALSE == bEnable)
{
::MessageBox(NULL,"Before CAP_FEEDERLOADED FALSE", "aUTO", MB_OK);
}
else
{
::MessageBox(NULL,"Before CAP_FEEDERLOADED TRUE", "aUTO", MB_OK);
}
}

L_TwainFreeContainer(&twCap);

L_TwainEndCapsNeg(m_hSession);

Our moderator split your post from the thread it was in, because this question is not directly related to the original one.

From the above code that you included in the question, I noticed that there are steps you miss to include. We have tutorial named "Set up a TWAIN Feeder Scan" in our TWAIN C DLL help file that shows how to create and run a program that implements LEADTOOLS TWAIN Feeder features. Please check it out and see if the problems are solved.

If not, use the Twacker utility to see if the problem is triggered or not. The Twacker utility is the standard test tool from the Twain working group, so if a driver does not work with it, the problem is most likely not related to our toolkit. If you don't have Twacker, you can obtain it by using the following link:
http://twain.org/images/docs/Twack_32.msi