Question

在我的跨平台cocos2dx游戏中，我想从Web上异步加载一些图像并将它们保存到本地存储。对于Android部分，我使用JNI调用下载并使用本机java代码将映像保存到存储。它完美无缺。但是当我尝试在一个单独的pthread中执行此操作以防止我的游戏冻结时，我得到错误：＆＃34;本机线程退出而没有分离＆＃34;在＆＃34; ThreadFunction（void * arg）＆＃34;完了。

这是我的c ++代码：

//c++ code
void MyClass::loadImages(){
    pthread_t thread;
    SimpleStructure* args = new SimpleStructure();
    args->s_url = url;
    args->s_savename = savename;
    pthread_create(&thread, NULL, &ThreadFunction, args);
}

void* ThreadFunction(void * arg) {
    SimpleStructure * args = (SimpleStructure * ) arg;

    std::string localImagePath;
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
        localImagePath = getImageFilePathJNI(args->s_url.c_str(),
                                             args->s_savename.c_str());
    #endif
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
        localImagePath = URLSpriteHelper::getUrlSprite(args->s_url, 
                                                       args->s_savename);
    #endif

    pthread_mutex_lock(&mutex);
    loadedImages.push_back(localImagePath);
    pthread_mutex_unlock(&mutex);
    return NULL;
}

这是我的JNI代码：

extern "C"
{
    std::string getImageFilePathJNI(const char* urlStr, const char* saveName)
    {
        std::string ret;
        JniMethodInfo t;

        if (JniHelper::getStaticMethodInfo(t, 
                                           "org/cocos2dx/cpp/AppActivity",
                                           "saveImageFromURLtoInternalStorage", 
                                           "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;")) {

            jstring StringArg1 = t.env->NewStringUTF(urlStr);
            jstring StringArg2 = t.env->NewStringUTF(saveName);

            jstring retFromJava = (jstring)t.env->CallStaticObjectMethod(t.classID, t.methodID, StringArg1, StringArg2);
            const char* str = t.env->GetStringUTFChars(retFromJava, 0);
            ret = str;

            t.env->ReleaseStringUTFChars(retFromJava, str);
            t.env->DeleteLocalRef(StringArg1);
            t.env->DeleteLocalRef(StringArg2);
            t.env->DeleteLocalRef(t.classID);
        }
        return ret;
    }
}

任何想法我做错了什么？

非常感谢！

Answer 1

cocos2dx论坛回答了问题。

http://discuss.cocos2d-x.org/t/multithreading-with-pthread-and-jni-calls-crashs-with-native-thread-exited-without-detaching/15625

cocos2dx：使用pthread和JNI的多线程调用崩溃，“本机线程退出而不分离”

1 个答案: