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原文如下:
I consulted with our Twain expert on this issue and he has seen this before with a scanner working in Twain version 1.0 and may not work in Twain version 2.0. This may be why the scanner is not working with the latest version of LEADTOOLS. LEADTOOLS v16 defaulted to using Twain version 1.0 since Twain 2.0 did not exist when LEADTOOLS v16 was released. LEADTOOLS version 19 defaults to using Twain version 2.0 which the scanner may not have drivers for, therefore the drop down list is not populated correctly. Could you have your customer try to specifically set the Twain version to 1.0 in their code on the Twain Session to see if this resolves the issue? This can be done with the TwainSession.SetVersion method: