Unity3d C# HttpWebRequest 异步下载文件

来源：互联网发布：重庆国际物流数据编辑：程序博客网时间：2024/06/06 00:27

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 initializationvoid 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 framevoid Update () {}}

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