Article:		Java Tech: Acquire Images with TWAIN and SANE, Part 2
Subject:		dummy questions
Date:		2005-11-22 21:16:03
From:		javajeff
Response to: dummy questions
Hello, Thanks for your kind words. Here are the answers to your questions: > 1.- the jtwain.dll and the jtwain.class manage every kind of scanner? Ideally, the DLL and class should work with every kind of scanner. However, I am aware that some scanners don't work properly with JTwain while other scanners have no problem. I assume that the problem is due to a scanner's data source DLL (I have learned that poorly-written data sources are usually the cause of many problems). > 2.- if i want more functions i must modify by myself the jtwain.cpp? You can contact me and I will see what I can do to help. I won't make any promises that I can implement your functionality, but I will consider it. > 3.- can i put the jtwain.dll, jtwain.class, jtwainexception.class and UnsupportedCapabilityException.class in a jar and use only this jar? these are all the files that i need? You cannot put a DLL into a Jar file. However, I believe the classfiles can be placed into a Jar, although I haven't tried to do so. The DLL is typically placed in the Windows directory -- such as c:\windows under Windows 98 SE. I believe these are all the files you need. > 4.- can i use your code in my commercial application? Feel free to use the code in a commerical application. > 5.- i look in the installation files of my scanner (hp) and i found some files called twain.dll, what are these files? can i use them? I explained these files in the first installment of this series. Here is the pertinent paragraph: For the Windows platform, there are two source managers: the twain.dll 16-bit source manager and the twain_32.dll 32-bit source manager. Both source managers exist in my c:\windows directory. Along with those files are twunk_16.exe and twunk_32.exe. They make it possible for the 32-bit source manager to enumerate 16-bit sources and for the 16-bit source manager to enumerate 32-bit sources. In this series, the only source manager file I'm interested in is twain_32.dll. All the best. Jeff