我使用native c将数据从音频文件读取到jbyte指针。现在我想把它作为JByTeRaye发送给Java。
jbyteArray Java_com_app_audio_player_readData(JNIEnv * env, jobject jobj,jstring readPath)
{
FILE *fin;
const char *inFile= (*env)->GetStringUTFChars(env,readPath,0);
fin = fopen(inFile, "r");
fseek(fin, 0, SEEK_END); // seek to end of file
int size = ftell(fin); // get current file pointer
fseek(fin, 0, SEEK_SET);
jbyte *data=(jbyte *)malloc(size*sizeof(jbyte));
int charCnt = 0;
charCnt=fread(data, 1, size, fin);
jbyteArray result=(*env)->NewByteArray(env, size);
//-- I want to convert data to jbyteArray and return it to java
fclose(fin);
return result;
}
怎么做的?
最佳答案
使用SetByteArrayRegion
charCnt=fread(data, 1, size, fin);
jbyteArray result=(*env)->NewByteArray(env, size);
(*env)->SetByteArrayRegion(env, result, 0, size, data);
也可以使用
GetByteArrayElements
如:
jboolean isCopy;
jbyte* rawjBytes = (*env)->GetByteArrayElements(env, result, &isCopy);
//do stuff to raw bytes
memcpy(rawjBytes, data, size*sizeof(jbyte));
(*env)->ReleaseByteArrayElements(env, result, rawjBytes, 0);
see here了解有关
SetByteArrayRegion
、GetByteArrayElements
和ReleaseByteArrayElements
的更多详细信息。注:这个问题可能是this question