I want to connect magnetic card reader, send commands and get responses with Java (COM Port) in Windows XP. I have .h file & dll. I want use dll functions. How can I connect or send device?
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possible duplicate of [java api to send file through serial port](http://stackoverflow.com/questions/2003821/java-api-to-send-file-through-serial-port) – trashgod Jun 01 '11 at 05:22
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@trashgod, I want send command and RECEIVE responses, not send file – totali Jun 01 '11 at 05:34
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@trashgod, but the DLL probably has high level functions specific for his reader which he would be missing in those libraries. – Eelke Jun 01 '11 at 05:40
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Ah, I see; now it makes sense. – trashgod Jun 01 '11 at 05:44
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You will need to use JNI (Java Native Interface), google it for details. You probably will have to write some wrappers around the DLL in C first before JNI can use it.
Eelke
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+1. Can I solve my problem with Java APIs (Javax.comm or RXTX, not using JNI or write some code in C)? – totali Jun 01 '11 at 05:50
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@totali: I found @Eelke's comment and answer very helpful; I've clarified your question and up-voted the answer accordingly. When you have sufficient reputation, I urge you to do likewise. You may also want to review the [faq](http://stackoverflow.com/faq). – trashgod Jun 01 '11 at 06:00
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@totali: using JNA as trashgod suggest in his answer shouldn't require any C but I have no experience with it. If you know the full serial protocol you can use any serial java communication library, see trashgods earlier comments. – Eelke Jun 01 '11 at 08:57