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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 Commented Jun 1, 2011 at 5:22
  • @trashgod, I want send command and RECEIVE responses, not send file Commented Jun 1, 2011 at 5:34
  • @trashgod, but the DLL probably has high level functions specific for his reader which he would be missing in those libraries. Commented Jun 1, 2011 at 5:40
  • Ah, I see; now it makes sense. Commented Jun 1, 2011 at 5:44

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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.

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3 Comments

+1. Can I solve my problem with Java APIs (Javax.comm or RXTX, not using JNI or write some code in C)?
@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.
@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.
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As an alternative, you may be able to bind to the dll using JNA.

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