基于Dev C++开发JNI

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1.准备一JAVA类

package basesdk.tech.jni;public class TestHello {static {//TestHello2.dll文件需要放到jre/bin目录下,否则报文件找不到.System.loadLibrary("TestHello2");}public static native void hello(String msg);public static void main(String[] args) {hello("Hello,ChenZhian.\nMushroom!!!!");}}

2.利用javah命令生成JNI头文件：命令行下，进入eclipse工程bin目录，运行javah basesdk.tech.jni.TestHello，

回车即可在bin目录下生成文件：basesdk_tech_jni_TestHello.h，内容如下：

/* DO NOT EDIT THIS FILE - it is machine generated */#include <jni.h>/* Header for class basesdk_tech_jni_TestHello */#ifndef _Included_basesdk_tech_jni_TestHello#define _Included_basesdk_tech_jni_TestHello#ifdef __cplusplusextern "C" {#endif/* * Class:     basesdk_tech_jni_TestHello * Method:    hello * Signature: (Ljava/lang/String;)V */JNIEXPORT void JNICALL Java_basesdk_tech_jni_TestHello_hello  (JNIEnv *, jclass, jstring);#ifdef __cplusplus}#endif#endif

3.打开Dev C++ ，新建工程->DLL：工程属性选择“C工程”。把文件basesdk_tech_jni_TestHello.h添加到工程中，最终dllmain.c代码如下：

#include <windows.h>#include <basesdk_tech_jni_TestHello.h>JNIEXPORT void JNICALL Java_basesdk_tech_jni_TestHello_hello(JNIEnv *env, jclass obj, jstring jMsg){    const char *strMsgPtr = (*env)->GetStringUTFChars(env,jMsg,0);        MessageBox( 0, strMsgPtr,"Message box from Dev C++ ", 0 );     (*env)->ReleaseStringUTFChars(env, jMsg, strMsgPtr); }

4.编译，OK