Configure Java JNI dynamic library development in VC6.0

JAVA is a software development language running on virtual machines. It relies on virtual machines to explain bytecode, cleverly implementing cross-platform. JAVA is relatively secure because it is closed. However, external calls are implemented through the JNI dynamic library. Today, we will explain how to develop a JNI dynamic library for vc6.0 configuration.

1, need to download resources 1, jdk-7u45-windows-i586 2, vc6.0.

2. Compile a java Helloworld class

Public class HelloWorld {public native void displayHelloWorld (); // declare static {System. loadLibrary ("HelloWorldImpl"); // load the dynamic link library. "HelloWorldImpl" is the name of the dynamic link library to be loaded .} Public static void main (String [] args) {// TODO Auto-generated method stubHelloWorld helloWorld = new HelloWorld (); helloWorld. displayHelloWorld ();}}

3. Export HelloWorld. h

d:\JNI>javac HelloWorld.java

The exported content is as follows:

/* DO NOT EDIT THIS FILE - it is machine generated */#include 
 
  /* Header for class HelloWorld */#ifndef _Included_HelloWorld#define _Included_HelloWorld#ifdef __cplusplusextern "C" {#endif/* * Class:     HelloWorld * Method:    displayHelloWorld * Signature: ()V */JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld  (JNIEnv *, jobject);#ifdef __cplusplus}#endif#endif
 

4. Use the vc6.0 win32dll project to add the header file and write the local implementation file

#include "HelloWord.h"#include 
 
  #include 
  
   /* * Class:     HelloWorld * Method:    displayHelloWorld * Signature: ()V */JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld  (JNIEnv *, jobject) {    printf("Hello World!\n");    return;}
  
 

5. Configure the header file of vc6.0 to include directories and library files. And pin the newly added Path to the top.

Last step compilation

Successful.