handle event on window menu using jni

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Java

JNI

VisualC++

sir I have added one own menu item in window menu using jni,vc++,java. sir I want to handle event on that item using jni.how it can be possible. sir this can be done by jinvoke package in java.This package contain user32 class.so it can be done by jinvoke package. But sir I can't use this package because this is licence version package.And I don't have the licence of this package.so I choose the process of jni.And I have added one own menu in window menu using findwindow,Getsystemmenu and insertmenu. but I am not understanding that how can get handle of window menu and message from window menu when click on own window menu item in java.when click on own window menu item in java and handle of window menu pass to vc++ code.how it can be possible.please sir help me.