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WIA Scanner works with TWAIN methods but not WIA methods
Posted: Thu Apr 11, 2013 11:24 pm
by gabriel91
I think this is a weird error. I have an EPSON scanner that installs both TWAIN and WIA drivers. If I call TWAINAcquitreToGdPictureImage() with the WIA scanner name it works, but if I call WiaAcquireToGdPictureImage() with the sourceId, it just returns 0. How can this be?
Re: WIA Scanner works with TWAIN methods but not WIA methods
Posted: Mon Nov 27, 2017 8:40 am
by carine14
If a device can have two or more drivers, test these drivers thoroughly for compatibility with each other. For example, if one driver leaves the device in an unusable state (such as the driver not sending the close session message in some protocol), the other driver might fail when it tries to communicate with the device. This situation happens often with serial devices.