Unity数据下载

/* HttpRequestTest.cs
 * 采用C#的WebClinet类下载数据，多线程，但需要在主线程里转成texture。
 */
using System;
using System.Text;
using System.Net;
using UnityEngine;

public enum RequestType
{
    Text,
    Image
}

public interface IHttpRequest
{
    void CaptureRequestData(int requestTag, string requestData);
    void CaptureRequestTexture(int requestTag, byte[] texture);
    void LostRequestData(int requestTag, string requestData);
}

public class HttpRequestInfo
{
    public IHttpRequest httpRequest;
    public RequestType requestType;
    public int requestTag;
    
    public HttpRequestInfo (IHttpRequest httpRequest, RequestType requestType, int requestTag)
    {
        this.httpRequest = httpRequest;
        this.requestType = requestType;
        this.requestTag = requestTag;
    }
}

public class HttpRequestTest : MonoBehaviour
{
    public static HttpRequestTest inst = null;

    void Awake()
    {
        inst = this;
    }

    public void DownloadData(IHttpRequest httpRequest, RequestType requestType, string httpUrl, int requestTag)
    {
        WebClient webClient = new WebClient();
        webClient.DownloadDataCompleted += DownloadDataCompletedCallback;
        webClient.DownloadDataAsync(new Uri(httpUrl), new HttpRequestInfo(httpRequest, requestType, requestTag));
    }

    private void DownloadDataCompletedCallback(object sender, DownloadDataCompletedEventArgs args)
    {
        HttpRequestInfo    httpRequestInfo = args.UserState as HttpRequestInfo;
        if(!args.Cancelled && args.Error == null)
        {
            if(httpRequestInfo.requestType == RequestType.Text)
            {
                httpRequestInfo.httpRequest.CaptureRequestData(httpRequestInfo.requestTag, Encoding.UTF8.GetString(args.Result));
            }
            else if(httpRequestInfo.requestType == RequestType.Image)
            {
                httpRequestInfo.httpRequest.CaptureRequestTexture(httpRequestInfo.requestTag, args.Result);
            }
        }
        else
        {
            string requestError = args.Error.Message;
            httpRequestInfo.httpRequest.LostRequestData(httpRequestInfo.requestTag, requestError);
        }
    }

}



/* HttpRequestTestNew.cs
 * 方便直接，但不是多线程，因此能得到texture。
 */
using UnityEngine;
using System.Collections;

public enum RequestType
{
    Text,
    Image
}

public interface IHttpRequest
{
    void CaptureRequestData(int requestTag, string requestData);
    void CaptureRequestTexture(int requestTag, Texture texture);
    void LostRequestData(int requestTag, string requestData);
}

public class HttpRequestTestNew : MonoBehaviour
{
    public static HttpRequestTestNew inst = null;

    void Awake()
    {
        inst = this;
    }

    public void DownloadData(IHttpRequest httpRequest, RequestType requestType, string httpUrl, int requestTag)
    {
        WWW www = new WWW(httpUrl);
        StartCoroutine(DownloadCoroutine(www, httpRequest, requestType, requestTag));
    }

    private IEnumerator DownloadCoroutine(WWW www, IHttpRequest httpRequest, RequestType requestType, int requestTag)
    {
        yield return www;
        if(!string.IsNullOrEmpty(www.error))
        {
            Debug.LogError("www is error!");
            httpRequest.LostRequestData(requestTag, www.error);
        }
        else
        {
            switch(requestType)
            {
            case RequestType.Text:
                httpRequest.CaptureRequestData(requestTag, www.text);
                break;
            case RequestType.Image:
                httpRequest.CaptureRequestTexture(requestTag, www.texture);
                break;
            }
        }
        if(www.isDone)
            www.Dispose();
    }
}