学步园

Java:

public class TestJNI
{
	static
	{
		System.loadLibrary("TestJNI");
	}
	public native DiskInfo[] getStructArray();
	public static void main(String[] args)
	{
		TestJNI jni = new TestJNI();
		DiskInfo[] infos = jni.getStructArray();
		for(int i = 0; i < infos.length; i++)
		{
			System.out.println(infos[i].name + " : " + infos[i].serialNo);
		}
	}
}

class DiskInfo
{
	public String name;		// 名称
	public int serialNo;	// 序列号
}

C++:

#include "TestJNI.h"

/*
typedef struct
{
	char name[101];		// 名称
	int serialNo;		// 序列号
} DiskInfo;
*/

JNIEXPORT jobjectArray JNICALL Java_TestJNI_getStructArray(JNIEnv *env, jobject jobj)
{
	jobjectArray infos = NULL;	// jobjectArray 为指针类型
	jclass clsDiskInfo = NULL;		// jclass 为指针类型
	jobject obj;
	jfieldID nameID;
	jfieldID serialNoID;
	jmethodID consID;
	jsize len;
	int i;

	clsDiskInfo = env->FindClass("DiskInfo");
	len = 5;
	infos = env->NewObjectArray(len, clsDiskInfo, NULL);
	nameID = env->GetFieldID(clsDiskInfo, "name", "Ljava/lang/String;");
	serialNoID = env->GetFieldID(clsDiskInfo, "serialNo", "I");
	consID = env->GetMethodID(clsDiskInfo, "<init>", "()V");
	for(i = 0; i < len; i++)
	{
		obj = env->NewObject(clsDiskInfo, consID);
		env->SetObjectField(obj, nameID, env->NewStringUTF("disk"));
		env->SetIntField(obj, serialNoID, (jint)i);
		env->SetObjectArrayElement(infos, i, obj);
	}
	return infos;
}
/*
cl -I%java_inc% -I%java_inc%\win32 -LD TestJNI.cpp -FeTestJNI.dll
*/