c# – UnityWebRequest.downloadHandler返回null,同时从Node Server获得响应

概述我正在Unity上创建一个注册场景.在后端我有MongoDB的NodeJS服务器.注册成功,数据也保存在Mongo上. 这是我的NodeJS api用于注册 api.post('/register', (req,res) => {Account.register(new Account({username: req.body.username}), req.body.password, func 我正在Unity上创建一个注册场景.在后端我有MongoDB的NodeJs服务器.注册成功,数据也保存在Mongo上.

这是我的NodeJs API用于注册

API.post('/register',(req,res) => {Account.register(new Account({username: req.body.username}),req.body.password,function(err,account){  console.log("acc: "+account);  if(err){    if (err.name == "UserExistsError") {      console.log("User Exists");      return res.status(409).send(err);    }else {      console.log("User Error 500");      return res.status(500).send(err);    }  }else {    let newUser = new User();    newUser.accountID = account._ID;    newUser.name = req.body.fullname;    newUser.gender = req.body.gender;    newUser.role = req.body.role;    newUser.country = req.body.country;    newUser.coins = req.body.coins;    newUser.save(err => {      if(err){        console.log(err);        return res.send(err);      }else{        console.log('user saved');        res.Json({ message: 'User saved' });      }    });    passport.authenticate(      'local',{        session: false      })(req,res,() => {         res.Json({ registermsg: 'Successfully created new account'});      });  }});});

这是我在Unity C中的POST协同程序#

IEnumerator Post(string b) {    byte[] bytes = System.Text.EnCoding.ASCII.GetBytes(b);    using (UnityWebRequest www = new UnityWebRequest(BASE_URL,UnityWebRequest.khttpVerbPOST)) {        UploadHandlerRaw uH = new UploadHandlerRaw(bytes);        www.uploadHandler = uH;        www.SetRequestheader("Content-Type","application/Json");        yIEld return www.Send();        if (www.isError) {            DeBUG.Log(www.error);        } else {            lbltext.text = "User Registered";            DeBUG.Log(www.ToString());            DeBUG.Log(www.downloadHandler.text);        }    }}

我正在尝试DeBUG.Log(www.downloadHandler.text);但是我得到了NullReferenceException.

我想问一下,我正在使用的方式在我的API中返回响应是否正确？如果是,我如何在Unity端使用该响应.

解决方法 UnityWebRequest.Post,UnityWebRequest.Get和其他创建UnityWebRequest新实例的UnityWebRequest functions将自动附加DownloadHandlerBuffer.

现在,如果使用UnityWebRequest构造函数创建UnityWebRequest的新实例,则DownloadHandler不会附加到该新实例.您必须使用DownloadHandlerBuffer手动执行此 *** 作.

IEnumerator Post(string b){    byte[] bytes = System.Text.EnCoding.ASCII.GetBytes(b);    using (UnityWebRequest www = new UnityWebRequest(BASE_URL,UnityWebRequest.khttpVerbPOST))    {        UploadHandlerRaw uH = new UploadHandlerRaw(bytes);        DownloadHandlerBuffer dH = new DownloadHandlerBuffer();        www.uploadHandler = uH;        www.downloadHandler = dH;        www.SetRequestheader("Content-Type","application/Json");        yIEld return www.Send();        if (www.isError)        {            DeBUG.Log(www.error);        }        else        {            lbltext.text = "User Registered";            DeBUG.Log(www.ToString());            DeBUG.Log(www.downloadHandler.text);        }    }}

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