jni和C++二维数组

 

jobjectArray vectorToArray(JNIEnv * env, vector<vector<double>> vec){
	jobjectArray objArray;
	jclass doubleArray = env->FindClass("[D");
	if (doubleArray == NULL) return NULL;
	int size = vec.size();
	objArray = env->NewObjectArray(size, doubleArray, NULL);
	if (objArray == NULL) return NULL;
	for (int i = 0; i < size; i++)  {
		jdouble tmp[256]; 
		int j;
		int size2 = vec[i].size();
		jdoubleArray iarr = env->NewDoubleArray(size2);
		if (iarr == NULL) return NULL;
		for (j = 0; j < size2; j++) {
			tmp[j] = vec[i][j];
		}
		env->SetDoubleArrayRegion(iarr, 0, size2, tmp);
		env->SetObjectArrayElement(objArray, i, iarr);
		env->DeleteLocalRef(iarr);
	}
	return objArray;
}

 

java端调用，用Object[]接收即可，c++调用类型设置([Ljava/lang/Object;)V

 

 

 

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