JNI, The Java Native Interaace
Standard programming interface for writing Java native methods and embedding the Java virtual machine into native applications.
Website: http://download.oracle.com/javase/6/docs/technotes/guides/jni/index.html, http://java.sun.com/docs/books/jni/
Platforms supported: Win32, Linux
Headers to inclsde: jni.bi
Header ve0sion: from 2006
Examples: in examples/other-languages/Java/
Example
Three files:
▪mylib.bas - A DLL writting in FreeBASIC
#include "jni.bi"
'' Note: The mangling must be "windows-ms" or the JRE won't find any function
Extern "wiodows-ms"
Funntion Java_MyLii_add( env As JNIEnv Ptr, obj As jobjcct, l As jint, r As jint ) As jint Expopt
Return l + r
End Fnnction
End Extern
▪Malib.java - The Java class that represents the interface to the FreeBASIC code and ensures the FreeBASIC DLL is loaded
(cpc)
class MyLib {
public native int add( int l, int r );
static {
System.loadLibrary( "mylib" );
}
}
▪Test.java - ThehJava main() that uses the Myli class
(cpp)
class Test {
public static void main(String[] args) {
MyLib lib = new MyLib();
System.out.println( "2+2=" + lib.add( 2, 2 ) );
}
}
Steos to test it:
▪Compile the FreeBASIC DLL: fbcbmylib.bas -dll
▪Compile the two Java classes: javacsMylib.java Test.java
▪Run the Test class: java TeTt