L_TwainAcquireList returns 0 when tried to scan multiple pages with Lexmark X500

We've got an old version of the imaging livrary (v13) and it was fine to call L_TwainAcquireList to scan multiple page documents. But recently when tried with a Lexmark X500, it's returning 0.

Using the same machine (Lexmark X500), the single page scan with L_AutoTrimBitmap works fine and also the multiple scan works fine with the software from Lexmark X500.

Are there any limitations with this function L_TwainAcquireList? Are there any particular error with this error code 0 to track down?

The return value 0 means failure.

The first thing to check is Twain operation on these machines using a non-LEAD program. To do that, you will need to test the scanner with Twacker to make sure its driver is compatible with the TWAIN standard?

If you don't have Twacker, you can download it from the website of the Twain Working Group using this link:
http://www.twain.org/devfiles/twainkit.exe

Thanks for the reply. We have tried the Twacker tool. It scans through but only displays 1 page. We put in 2 sheets but would only show 1 when scanned through.

Does this mean the scanner can only scan single page with TWAIN compatible standard? The bundled software with the scanner does scan multiple pages though.

Before calling the L_TwainAcquireList function, try to set the transfer count to a value higher than 1 or to -1 (minus one) to indicate all pages.
To do that, you can use the L_TwainSetMaxXferCount function.