Java Call DLL

How can a function in a DLL be called in Java?

The key is that the native function name parameter in Java is identical to the local function name parameter in the DLL.

This program is the SUM function in the call DLL in Java.

One, Java code part operation

1. New Project

2.dlltest.java Code

Package Com.aizizai.calldll;public class Dlltest {static {system.loadlibrary ("Hellodll");} public static native int sum (int a, int b);p ublic static void Main (string[] args) {System.out.println ("sum (2,5) =" + SUM ( 2, 5));}}

3. Generating the header file

Java Call DLL Test \src>javac Com/aizizai/calldll/dlltest.java

Java Call DLL Test \src>javah com.aizizai.calldll.DllTest

Second, VC uses the previous header file to generate the DLL. This article uses the VS2010.

1. Create a project

New Project--VC + +-Win32 Project--named Hellodll---Application type: DLL-->ok.

2. Add a header file

A. Put

/jdk/include/jni.h

/jdk/include/win32/jawt_md.h

/jdk/include/win32/jni_md.h

Copy to the project directory or to the include directory of VS.

B. Add in StdAfx.h

#include "Com_aizizai_calldll_dlltest.h"

3. Add a function implementation in the source file

Hellodll.cpp: Defines an export function for a DLL application. #include "stdafx.h" Jniexport jint jnicall java_com_aizizai_calldll_dlltest_sum (jnienv *env, Jclass SS, Jint A, Jint b) { return a+b;}

4. Building a DLL

Build---> Build DLL.

Can be seen in the debug directory of the project, Hellodll.dll file

Third, use

Copy the DLL file to the C:\Windows directory and run the Java program. Ok.

Program: http://download.csdn.net/detail/u012587637/8065041

Java Call DLL