JNI中字符串之间的转换

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    static jstring stoJstring(JNIEnv* env, const char* pat)    {       jclass strClass = (*env)->FindClass(env, "Ljava/lang/String;");       jmethodID ctorID = (*env)->GetMethodID(env, strClass, "<init>", "([BLjava/lang/String;)V");       jbyteArray bytes = (*env)->NewByteArray(env, strlen(pat));       (*env)->SetByteArrayRegion(env, bytes, 0, strlen(pat), (jbyte*)pat);       jstring encoding = (*env)->NewStringUTF(env, "utf-8");        return (jstring)(*env)->NewObject(env, strClass, ctorID, bytes, encoding);    }>    static char* jstringTostring(JNIEnv* env, jstring jstr)    {       char* rtn = NULL;       jclass clsstring = (*env)->FindClass(env, "java/lang/String");       jstring strencode = (*env)->NewStringUTF(env, "utf-8");       jmethodID mid = (*env)->GetMethodID(env, clsstring, "getBytes", "(Ljava/lang/String;)[B");       jbyteArray barr= (jbyteArray)(*env)->CallObjectMethod(env, jstr, mid, strencode);       jsize alen = (*env)->GetArrayLength(env, barr);       jbyte* ba = (*env)->GetByteArrayElements(env, barr, JNI_FALSE);       if (alen > 0)       {     rtn = (char*)malloc(alen + 1);     memcpy(rtn, ba, alen);     rtn[alen] = 0;       }       (*env)->ReleaseByteArrayElements(env, barr, ba, 0);       return rtn;    }

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