C# 在下载的同时从UnityWebRequest获取数据？

我有以下代码来进行REST调用：

public IEnumerator GetCooroutine(string route)
{
    string finalURL = URL + route;
    UnityWebRequest www = UnityWebRequest.Get(finalURL);
    yield return www.SendWebRequest();

    if (www.isNetworkError || www.isHttpError) {
        Debug.Log(www.error);
    }
    else {
        Debug.Log("GET succesfull. Response: " + www.downloadHandler.text);
    }
}

我需要在他们接收请求时访问请求的数据或主体，并将其用于其他内容。我不想等到它完成接收后再访问它们

---

如果我使用

yield

，代码将等待

发送

完成它的执行，我不希望这样。

可以使用

UnityWebRequest

执行，但您必须执行额外的工作。秘诀是将

DownloadHandlerScript

与

UnityWebRequest

一起使用

创建一个单独的类，并使其派生自

DownloadHandlerScript

，而不是

MonoBehavior

。在下面的示例中，我将其称为

CustomWebRequest

。重写

bool ReceiveData（byte[]data，int-dataLength）

，

void CompleteContent（）

及其内部的

void ReceiveContentLength（int-contentLength）

函数

下面是

CustomWebRequest

类的一个示例：

public class CustomWebRequest : DownloadHandlerScript
{
    // Standard scripted download handler - will allocate memory on each ReceiveData callback
    public CustomWebRequest()
        : base()
    {
    }

    // Pre-allocated scripted download handler
    // Will reuse the supplied byte array to deliver data.
    // Eliminates memory allocation.
    public CustomWebRequest(byte[] buffer)
        : base(buffer)
    {
    }

    // Required by DownloadHandler base class. Called when you address the 'bytes' property.
    protected override byte[] GetData() { return null; }

    // Called once per frame when data has been received from the network.
    protected override bool ReceiveData(byte[] byteFromServer, int dataLength)
    {
        if (byteFromServer == null || byteFromServer.Length < 1)
        {
            Debug.Log("CustomWebRequest :: ReceiveData - received a null/empty buffer");
            return false;
        }

        //Do something with or Process byteFromServer here


        return true;
    }

    // Called when all data has been received from the server and delivered via ReceiveData
    protected override void CompleteContent()
    {
        Debug.Log("CustomWebRequest :: CompleteContent - DOWNLOAD COMPLETE!");
    }

    // Called when a Content-Length header is received from the server.
    protected override void ReceiveContentLength(int contentLength)
    {
        Debug.Log(string.Format("CustomWebRequest :: ReceiveContentLength - length {0}", contentLength));
    }
}

就这样

• Unity首次发出请求时，

  ReceiveContentLength（int
  contentLength）

  被调用。您可以使用

  contentLength

  参数来确定将从该请求接收的总字节数

• 每次接收到新数据时，都会调用

  ReceiveData

  函数 通过该功能，您可以从

  byteFromServer

  参数及其从

  dataLength

  参数

• 当Unity完成接收数据时，

  CompleteContent

  功能被激活 打电话来

---

当他们接收到视频图像时，您需要访问哪些数据？我需要访问这些图像。很抱歉，我在度假时没有回答。但是是的，它是有效的。非常感谢你。

UnityWebRequest webRequest;
//Pre-allocate memory so that this is not done each time data is received
byte[] bytes = new byte[2000];

void Start()
{
    string url = "http://yourUrl/mjpg/video.mjpg";
    webRequest = new UnityWebRequest(url);
    webRequest.downloadHandler = new CustomWebRequest(bytes);
    webRequest.SendWebRequest();
}