Unity:从远程源解析JSON时出错 [英] Unity: Error Parsing JSON from Remote Source

问题描述

在Unity 5.4中，当我从StreamingAssets本地获取JSON文件时，可以通过 JsonUtility.FromJson 成功解析该JSON文件，但是可以通过 WWW 提取相同的文件当我从远程服务器上获取错误时，会引发错误( ArgumentException:JSON解析错误:无效值.).

In Unity 5.4, I have a JSON file I can successfully parse via JsonUtility.FromJson when I fetch it locally from StreamingAssets, but fetching that same same file via WWW throws an error (ArgumentException: JSON parse error: Invalid value.) when I fetch it from a remote server.

在通过 JsonUtility 进行解析之前，我可以输出本地和远程( jsonString )文件，它们是相同的(我什至已经在JSON中进行了验证)验证器.)

I can output both the local and remote (jsonString) files just prior to parsing by JsonUtility, and they are identical (I've even validated each in a JSON validator.)

这是我用来检索和解析远程JSON的代码:

Here's the code I'm using to retrieve and parse the remote JSON:

    void Prime(){
    string url = "https:content_url.json";
    WWW www = new WWW(url);
    StartCoroutine(WaitForContentJSON(www));
}

IEnumerator WaitForContentJSON(WWW contentData)
{
    yield return contentData;

    // check for errors
    if (contentData.error == null)
    {
        ParseJSON(contentData.text);

    } else {
        Debug.Log("WWW Error: "+ contentData.error);
    }    
}

void ParseJSON(string jsonString){
    var ac = JsonUtility.FromJson<ArticlesCollection>(jsonString);
}

调用 JsonUtility.FromJson

非常感谢您的帮助.

JSON:

{
  "articles": [ {
    "articleID": "1",
    "title": "Life & Death at the Mexican Border",
    "byline": "Part 1 of Life and Death...",
    "longDescription": "Part 1 of Life and Death...",
    "imageURL": "http://foo.jpg",
    "videoURL": "http://foot.mp4",
    "sceneAssetBundle": "scene_bundle_1",
    "sceneName": "scene_1",
    "featured": true,
        "duration": "7:12",
        "videoSize": "625"
  }, {
    "articleID": "2",
    "title": "Lake Mead",
    "byline": "The shrinking water....",
    "longDescription": "Welcome...",
    "imageURL": "http://vfoo.jpg",
    "videoURL": "http://food.mp4",
    "sceneAssetBundle": "scene_bundle_2",
    "sceneName": "scene_2",
    "featured": true,
        "duration": "1:45",
        "videoSize": "151"
  }, {
    "articleID": "3",
    "title": "Visi...",
    "byline": "Experience...",
    "longDescription": "Experience...",
    "imageURL": "http://foo.jpg",
    "videoURL": "http://foo.mp4",
    "sceneAssetBundle": "scene_bundle_2",
    "sceneName": "scene_2",
    "featured": false,
        "duration": "5:46",
        "videoSize": "478"
  } ]
}

从远程(S3)返回的JSON:

JSON returned from remote (S3):

{
  "articles": [ {
    "articleID": "1",
    "title": "Life & Death at...",
    "byline": "Part 1 of...",
    "imageURL": "http:foo.jpg",
    "videoURL": "http://foo.mp4",
    "featured": true,
        "duration": "7:12",
        "videoSize": "625"
  }, {
    "articleID": "2",
    "title": "Lake Mead",
    "byline": "The...",
    "longDescription": "Welcome...",
    "imageURL": "http://foo.jpg",
    "videoURL": "http://foo.mp4",
    "featured": true,
        "duration": "1:45",
        "videoSize": "151"
  }, {
    "articleID": "3",
    "title": "Visit",
    "byline": "Experience...",
    "longDescription": "Experience the...",
    "imageURL": "http:foo.jpg",
    "videoURL": "http://foo.mp4",
    "featured": false,
        "duration": "5:46",
        "videoSize": "478"
  } ]
}

同样，我已经在验证器中验证了这两个JSON文件，并且 JsonUtility.FromJson 调用在通过本地获取的JSON时工作正常，但是从远程源传递JSON时出错通过 WWW

Again, I've validated both of these JSON files in a validator, and again the JsonUtility.FromJson call works fine when passed the JSON fetched locally but errors when passed the JSON from the remote source fetched via WWW

然后，按照@dbc的请求，我将 ArticlesCollection 和 Articles 包装器类的正文发布到JSON解析的/against(?)中.但是同样，当在本地获取JSON时，此方法工作正常，因此我不怀疑这些文件中存在问题.

And, per @dbc's request I'm posting the body of my ArticlesCollection and Articles wrapper classes into/against(?) which the JSON is parsed. But again, this works fine when fetching the JSON locally, so I don't suspect there's an issue in these files.

ArticlesCollection :

using UnityEngine;

[System.Serializable]
public class ArticlesCollection
{
    public Article[] articles;
}

文章:

using UnityEngine;

[System.Serializable]
public class Article
{
    public string title;
    public int articleID;
    public string byline;
    public string longDescription;
    public string imageURL;
    public string experienceURL;
    public bool featured;
    public string duration;
    public string experienceSize;

    public string sceneAssetBundle;
    public string sceneName;
}

推荐答案

由于您使用的是 Unity 5.4 ，因此不应将WWW用于Web请求. UnityWebRequest替换了WWW，它解决了3个额外字节的问题.使用它的原因还有很多，例如对https的支持.

Since you are using Unity 5.4, you shouldn't be using WWW for web requests. UnityWebRequest replaced WWW and it solves that problem of 3 extra bytes. There are just many other reasons to use it such as support for https.

IEnumerator WaitForRequest(string url)
{
    UnityWebRequest www = UnityWebRequest.Get(url);
    yield return www.Send();
    if (www.isError)
    {
        Debug.Log("Error: " + www.error);
    }
    else
    {
        Debug.Log("Downloaded: " + www.downloadHandler.text);
        // byte[] results = www.downloadHandler.data;

        ArticlesCollection article = JsonUtility.FromJson<ArticlesCollection>(www.downloadHandler.text);
    }
}

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