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1. ±àд·¶ÀýÎĵµ
public class TestNative
{
private native static int Max(int a,int b);
public static void main(String[] args)
{
System.out.println(Max(4,5));
}
static
{
System.loadLibrary("VCdll");
}
}
ÆäÖÐ
LoadLibraryÖеÄDLLÎļþÃû³Æ¿ÉÒÔËæ±ã¶¨.Ö»Òª×öºÃµÄ¶¯Ì¬Á´½Ó¿â¸ÄÃû³ÉÕâ¸ö×Ö·û´®¾Í¿ÉÒÔÁË.¶ønativeº¯ÊýµÄÀ´Ô´¾ÍÊǸö¯Ì¬Á´½Ó¿â.
2. ×öºÃ¸Ã²½×¼±¸ÒÔºó,ÓÃjavac TestNative.javaÉú³ÉTestNative.class. ¼ìÑéÓï·¨.
3. Óï·¨¼ì²éͨ¹ýÒÔºó,ÓÃjavah TestNativeÉú³ÉTestNative.hµÄC++Í·Îļþ.
4. ÓÃVC++6.0´´½¨dllÎļþ:
<1>msdev->new->project->win32 Dynamic-Link Library
<2>Enter project name (e.g. VCdll)
<3>choose "An empty DLL project"->finish
<4>½«3Éú³ÉµÄTestNative.hºÍjdkϵÄjni.hºÍjni_md.h¼ÓÈëµ½¹¤³ÌÖÐÈ¥
<5>Create a c++ file, implements the native method. as follows:
//TestNative.cpp
#include "TestNative.h"
JNIEXPORT jint JNICALL Java_TestNative_Max
(JNIEnv * a, jclass b, jint x, jint y)
{
return x > y ? x : y;
}
±¸×¢:
A ÆäÖеÄjni.hͨ³£ÔÚ jdk\include\ ¿ÉÒÔÏÈ¿½±´µ½VC°²×°Ä¿Â¼ÏµÄincludeĿ¼ÏÂ.Ò»ÀÍÓÀÒÝ,ÒÔºó¿ÉÒÔ·½±ãʹÓÃJNI¼¼Êõ.
B È«²¿µÄÊý¾ÝÀàÐÍÐèÒª¿¼ÂÇJavaºÍVCµÄ½Ó¿ÚÎÊÌâ.ÓÃjint jstring µÈ.
C º¯ÊýÃû³ÆºÍ×Ô¶¯Éú³ÉµÄ.hÎļþÖй涨µÄÒ»ÖÂ.ÃüÃû¹æÔòÊÇ: Java_ʹÓÃÀà_·½·¨Ãû
6. È«±àÒëÒ»ÏÂVC++¹¤³Ì.
Èç¹ûûÓгö´í,Ôò´ËʱÉú³É¶¯Ì¬Á´½Ó¿â³É¹¦.
°Ñ¶¯Ì¬Á´½Ó¿âVCdll.dll¿½±´µ½TestNative.javaËùÔÚµÄĿ¼ÉÏ.
7.ÔËÐÐjava TestNative. OK :-)


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