java里面有如下本地定義：

private static native int setFilter(final int fd, final int[][] array_filter);

c++中對應的函數如下：

JNIEXPORT jint JNICALL Java_JniSocketCan_setFilter

(JNIEnv *env, jclass obj, jint fd, jobjectArray array_filter)

{

struct can_filter *pFilter = NULL;

jint filter_num = 0;

jint column_num = 0;

jint i;

jintArray filter_tmp;

jint mem_length = 0;

filter_num = env->GetArrayLength(array_filter);

DBG("filter_num = %d\n", filter_num);

mem_length = filter_num * sizeof(struct can_filter);

pFilter = (struct can_filter*)malloc(mem_length);

if (NULL == pFilter) {

LOG_ERR("memory is not enough, allocate failed\n");

return -2;

}

for (i = 0; i < filter_num; i++) {

filter_tmp = (jintArray)(env->GetObjectArrayElement(array_filter, i));

column_num = env->GetArrayLength(filter_tmp);

if (2 != column_num) {

LOG_ERR("array_filter column != 2, we only need can_id and can_mask\n");

return -1;

}

jint *pColumnData = env->GetIntArrayElements(filter_tmp, 0 );

pFilter[i].can_id = pColumnData[0];

pFilter[i].can_mask = pColumnData[1];

DBG("%d:id=0x%x,mask=0x%x\n", i, pFilter[i].can_id, pFilter[i].can_mask);

env->ReleaseIntArrayElements(filter_tmp, pColumnData, 0);

}

jint ret = setsockopt(fd, SOL_CAN_RAW, CAN_RAW_FILTER, pFilter, mem_length);

free(pFilter);

return ret;

}

java中調用的代碼如下：

int[][] can_filter = {

{0x234,0x7FF},

{0x235,0x7FF}

};

canTest.setFilter(s, can_filter);

原文：http://www.cnblogs.com/eaggle/p/7777738.html

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