char*转jstring
jstring charToJstring(JNIEnv *env, const char *pat) {
jclass strClass = (*env)->FindClass(env, "java/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);
}
jstring转char*
char *jstringToChar(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;
}
