最近一直在把公司游戏迁移到支持ARM64，中间出现了很多BUG或者Unity目前不支持操作的问题，这两天遇到异步HttpWebRequest不支持的问题，因为之前一直没有接触，所以也趁机学习了下相关使用。
下面通过一个例子，来使用HttpWebRequest异步下载一个ZIP文件。
using UnityEngine;using System.Collections;using System.Net;using System.IO;using System;using System.Threading;using System.Text;public class RequestState{ const int m_buffetSize = 1024; public StringBuilder m_requestData; public byte[] m_bufferRead; public HttpWebRequest m_request; public HttpWebResponse m_response; public Stream m_streamResponse; public RequestState() { m_bufferRead = new byte[m_buffetSize]; m_requestData = new StringBuilder(""); m_request = null; m_streamResponse = null; }}public class NewBehaviourScript : MonoBehaviour { FileStream fileStream=null; // Use this for initialization void Start () { fileStream = new FileStream("disunity_v0.3.4.zip", FileMode.Create); DownloadMusicAsyn(); } void DownloadMusicAsyn() { Debug.Log("DownloadMusicAsyn Thread Start"); try { HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create("http://dev.thisisgame.com.cn/disunity_v0.3.4.zip"); RequestState myRequestState = new RequestState(); myRequestState.m_request = myHttpWebRequest; Debug.Log("BeginGetResponse Start"); //异步获取; IAsyncResult result = (IAsyncResult)myHttpWebRequest.BeginGetResponse(new AsyncCallback(RespCallback), myRequestState); Debug.Log("BeginGetResponse End"); } catch (System.Exception ex) { Debug.LogError(ex.ToString()); } } void RespCallback(IAsyncResult result) { Debug.Log("RespCallback 0"); try { RequestState myRequestState = (RequestState)result.AsyncState; HttpWebRequest myHttpWebRequest = myRequestState.m_request; Debug.Log("RespCallback EndGetResponse"); myRequestState.m_response = (HttpWebResponse)myHttpWebRequest.EndGetResponse(result); Stream responseStream = myRequestState.m_response.GetResponseStream(); myRequestState.m_streamResponse = responseStream; //开始读取数据; IAsyncResult asyncreadresult = responseStream.BeginRead(myRequestState.m_bufferRead, 0, 1024, new AsyncCallback(ReadCallBack), myRequestState); return; } catch (System.Exception ex) { Debug.LogError(ex.ToString()); } } void ReadCallBack(IAsyncResult result) { Debug.Log("ReadCallBack"); try { RequestState myRequestState = (RequestState)result.AsyncState; Stream responseStream = myRequestState.m_streamResponse; int read = responseStream.EndRead(result); Debug.Log("read size =" + read); if (read > 0) { //将接收的数据写入; fileStream.Write(myRequestState.m_bufferRead, 0, 1024); fileStream.Flush(); //fileStream.Close(); //继续读取数据; myRequestState.m_bufferRead = new byte[1024]; IAsyncResult asyncreadresult = responseStream.BeginRead(myRequestState.m_bufferRead, 0, 1024, new AsyncCallback(ReadCallBack), myRequestState); } } catch (System.Exception ex) { Debug.LogError(ex.ToString()); } } void TimeoutCallback(object state, bool timeout) { if (timeout) { HttpWebRequest request = state as HttpWebRequest; if (request!=null) { request.Abort(); } } } // Update is called once per frame void Update () { }}再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow