//java字串轉C字串
char* Jstring2str(JNIEnv* env, jstring jstr)
{
    char* pStr = NULL;
    jclass     jstrObj   = env->FindClass("java/lang/String");
    jstring    encode    = env->NewStringUTF("utf-8");
    jmethodID  methodId  = env->GetMethodID(jstrObj, "getBytes", "(Ljava/lang/String;)[B");
    jbyteArray byteArray = (jbyteArray)env->CallObjectMethod(jstr, methodId, encode);
    jsize      strLen    = env->GetArrayLength(byteArray);
    jbyte      *jBuf     = env->GetByteArrayElements(byteArray, JNI_FALSE);
    if (jBuf > 0)
    {
        pStr = (char*)malloc(strLen + 1);
        if (!pStr)
        {
            return NULL;
        }
        memcpy(pStr, jBuf, strLen);
        pStr[strLen] = 0;
    }
    env->ReleaseByteArrayElements(byteArray, jBuf, 0);
    return pStr;
}
 

jstring轉wchar_t*