Posted on 2007-02-13 16:52
gyb 阅读(276)
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JAVA JNI
package com;
public
class
JniTest {
/*
* 本地方法
*/
public
native
int
get
();
public
native
void
set
(
int
i);
public
native
static
int
getName();
public
native
static
void
setName(
int
i);
public
static
void
main(String[] args) {
System.loadLibrary(
"
jnitest
"
);
JniTest.setName(
1
);
JniTest.setName(
2
);
JniTest t1
=
new
JniTest();
t1.
set
(
11
);
JniTest t2
=
new
JniTest();
t2.
set
(
22
);
System.
out
.println(JniTest.getName());
System.
out
.println(t1.
get
());
System.
out
.println(t2.
get
());
}
}
用javah -jni -d "T:/c/jnitest" com.JniTest得到com_JniTest.h头文件
将下面代码的#include <jni.h>改为#include "jni.h"/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_JniTest */
#ifndef _Included_com_JniTest
#define _Included_com_JniTest
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: com_JniTest
* Method: get
* Signature: ()I
*/
JNIEXPORT jint JNICALL Java_com_JniTest_get
(JNIEnv *, jobject);
/*
* Class: com_JniTest
* Method: set
* Signature: (I)V
*/
JNIEXPORT void JNICALL Java_com_JniTest_set
(JNIEnv *, jobject, jint);
/*
* Class: com_JniTest
* Method: getName
* Signature: ()I
*/
JNIEXPORT jint JNICALL Java_com_JniTest_getName
(JNIEnv *, jclass);
/*
* Class: com_JniTest
* Method: setName
* Signature: (I)V
*/
JNIEXPORT void JNICALL Java_com_JniTest_setName
(JNIEnv *, jclass, jint);
#ifdef __cplusplus
}
#endif
#endif
建立C工程：
在工程中加入头文件com_JniTest.h jni_md.h jni.h
创建一个新的C文件jnidll.c
#include "com_JniTest.h"
jint n = 0;
JNIEXPORT jint JNICALL Java_com_JniTest_get(JNIEnv *env, jobject obj)
{
return n;
}
JNIEXPORT void JNICALL Java_com_JniTest_set(JNIEnv *env, jobject obj, jint i)
{
n = i;
}
JNIEXPORT jint JNICALL Java_com_JniTest_getName(JNIEnv *env, jclass cls)
{
return n+10;
}
JNIEXPORT void JNICALL Java_com_JniTest_setName(JNIEnv *env, jclass cls, jint i)
{
n = i+5;
}
生成DLL文件给JAVA调用,DLL文件名为改为jnitest.dll好使得System.loadLibrary("jnitest");可以找到文件
注意：如果出现找不到方法的异常请修改jni_md.h中#define JNICALL __stdcall为：#define JNICALL然后重新编译DLL