C++ 来自本机C+的节点js回调+；代码正在抛出错误

我正在尝试实现事件侦听器。节点JS将订阅事件（使用C++函数）。当事件发生时，C++应该通知节点JS.

JS代码：

pal.subscribeEvent("ONSTATECHANGE", function(a) { console.log("Event received for ONSTATECHAN";});
function kcb (a)  {
    console.log("KCB .....ONSTATECHAN"+JSON.stringify(a));
}
pal.subscribeEvent("ONSTATECHANGE", kcb);

struct deviceNapi {
    Napi::Env env;   // to store JS Function Env
    Napi::Function jsCallback;   // to Store JS function
};

//std::multimap<int, Napi::Function> deviceEventMgmt;
std::multimap<int, struct deviceNapi> deviceEventMgmt;

Napi::Value PAL::subscribeEvent(const Napi::CallbackInfo& info) {
    Napi::Env env  = info.Env();
    int eventID = info[0].As<Napi::Number>().Int32Value();

    deviceNapi obj;
    obj.env = env;
    obj.jsCallback = info[1].As<Napi::Function>();

    deviceEventMgmt.insert(std::make_pair(eventID, obj));
    /*Napi::Function jsCallback = info[1].As<Napi::Function>();
    deviceEventMgmt.insert(std::make_pair(eventID, jsCallback));*/
}

void ProcessDeviceEvent(int evt, DeviceEvtData data) {
    switch(evt) {
        case ONSTATECHANGE:
            for(auto it = deviceEventMgmt.begin(); it != deviceEventMgmt.end(); it ++) {
                if(it->first == ENUM_VERIZON_DEVICE_PENDING_RESET) {
                    Napi::Env env = it.second.env;
                    Napi::Object ret = Napi::Object::New(env);

                    ret.Set("reason", Napi::String::New(env, data.resetReason));
                    ret.Set("time", Napi::Number::New(env, data.seconds));

                    it->second.jsCallback.Call(ret);
                }
            }

            /*for(auto it = deviceEventMgmt.begin(); it != deviceEventMgmt.end(); it ++) {
                if(it->first == ENUM_VERIZON_DEVICE_PENDING_RESET) {
                    it->second.Call();
                }
            }*/

            break;

        default:
            std::cout << "ProcessDeviceEvent : Currently not handling evt : " << evt << std::endl;
            break;
    }
}

C++代码：

pal.subscribeEvent("ONSTATECHANGE", function(a) { console.log("Event received for ONSTATECHAN";});
function kcb (a)  {
    console.log("KCB .....ONSTATECHAN"+JSON.stringify(a));
}
pal.subscribeEvent("ONSTATECHANGE", kcb);

struct deviceNapi {
    Napi::Env env;   // to store JS Function Env
    Napi::Function jsCallback;   // to Store JS function
};

//std::multimap<int, Napi::Function> deviceEventMgmt;
std::multimap<int, struct deviceNapi> deviceEventMgmt;

Napi::Value PAL::subscribeEvent(const Napi::CallbackInfo& info) {
    Napi::Env env  = info.Env();
    int eventID = info[0].As<Napi::Number>().Int32Value();

    deviceNapi obj;
    obj.env = env;
    obj.jsCallback = info[1].As<Napi::Function>();

    deviceEventMgmt.insert(std::make_pair(eventID, obj));
    /*Napi::Function jsCallback = info[1].As<Napi::Function>();
    deviceEventMgmt.insert(std::make_pair(eventID, jsCallback));*/
}

void ProcessDeviceEvent(int evt, DeviceEvtData data) {
    switch(evt) {
        case ONSTATECHANGE:
            for(auto it = deviceEventMgmt.begin(); it != deviceEventMgmt.end(); it ++) {
                if(it->first == ENUM_VERIZON_DEVICE_PENDING_RESET) {
                    Napi::Env env = it.second.env;
                    Napi::Object ret = Napi::Object::New(env);

                    ret.Set("reason", Napi::String::New(env, data.resetReason));
                    ret.Set("time", Napi::Number::New(env, data.seconds));

                    it->second.jsCallback.Call(ret);
                }
            }

            /*for(auto it = deviceEventMgmt.begin(); it != deviceEventMgmt.end(); it ++) {
                if(it->first == ENUM_VERIZON_DEVICE_PENDING_RESET) {
                    it->second.Call();
                }
            }*/

            break;

        default:
            std::cout << "ProcessDeviceEvent : Currently not handling evt : " << evt << std::endl;
            break;
    }
}

---

可以帮助我解决如何将节点函数Env存储到C++映射中的问题。我需要保存env，以便在调用节点回调时发送响应。

Napi:：env没有默认构造函数，因此DeviceAPI结构的默认构造函数无法初始化env成员，因此编译器没有生成它，但您尝试在此行中调用它：

deviceNapi obj;

您可以通过如下方式初始化它来修复此问题：

deviceNapi obj = {env, info[1].As<Napi::Function>()};

deviceNapi obj={env，info[1].As（）}；