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how to call DLL from java ? I want to integrate a java application to Windows. Let me take Outlook as an example, I have the Outlook dll, then how to call it ? do we have similar tutorial ?

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Use Java Native Access (JNA) : http://jna.java.net/

http://twall.github.com/jna/3.4.0/javadoc/overview-summary.html#overview_description

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with jna you dont neeed to write c/c++ code, works only with java! much more easy then jni!
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System.LoadLibrary can be used to load the libraries. Check this previous thread for example usage

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all you need is Java Native Interface http://docs.oracle.com/javase/1.5.0/docs/guide/jni/index.html

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See JNI it aims java to interact with other langages... many links have been posted

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You need to use JNI to call native functions. In your case it you need to load Library first in memory using Runtime.getRuntime().loadLibrary(PATH_OF_DLL_FILE)

you can use following link too http://www.equestionanswers.com/dll/java-call-dll-functions.php

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