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

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); 但我得到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。

Answer 1

UnityWebRequest.Post ， UnityWebRequest.Get和其他创建UnityWebRequest新实例的UnityWebRequest 函数将自动附加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手动执行此操作。

 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); } } } 

Answer 2

您简单地需要附加DownloadHandlerBuffer，您不需要新的UnityWebRequest！

DownloadHandlerBuffer dH = new DownloadHandlerBuffer(); www.downloadHandler = dH;