使用WebClient下载Unity3d中的大文件 [英] Downloading large file in Unity3d using WebClient

问题描述

我正在寻找有关使用WebClient在Unity3d中下载大型（100mg +）文件的任何想法。 WWW异步运行，除非它返回内存错误并且崩溃了应用程序，所以我已经转到了解决方案：

I am looking for any ideas regarding downloading large (100mg+) files in Unity3d using WebClient. WWW runs asynchronously and would be perfect except it returns a memory error and crashes the app, so I have moved to the solution as outlined here:

如何从url并保存在c sharp中使用unity3d的位置？

这样做就像一个梦想，除了，它关闭所有的脚本我的应用程序，直到下载完成。在下载的同时，我似乎甚至不能运行一个加载栏。我已经尝试处理这个通过添加协同程序来处理下载，但到目前为止，没有运气。

This works like a dream except it shuts down all the scripts in my app until the download is complete. I cannot seem to even run a loading bar at the same time as the download is going on. I have tried handling this by adding a coroutine to handle the download, but so far, no luck.

任何帮助将不胜感激。我的代码目前（经过多次迭代）看起来像：

Any help would be appreciated. My code currently (after many iterations) looks like:

C＃

 void Update()
    {
    //Sets up the timer so I can use it to watch the debugging
        timer += Time.deltaTime;
        Debug.Log (timer);

//Checks to see if the file was already downloaded and saved.  If not, it begins downloading.
    if (FileExists == 0 && timer >= 5) {
        StartCoroutine ("DOWNLOAD");

    } 
//If the file already exists, it jumps straight to the next scene.
    else if (FileExists == 1) {
        Application.LoadLevelAsync ("Different_Level");
    }

    //These are the buttons.  One should stop the download if the player decides they don't want to wait.
    if (Input.GetMouseButtonUp (0)) {

        RaycastHit rc_hit;
        Ray hud_ray = Camera.main.ScreenPointToRay (Input.mousePosition);

    if (Physics.Raycast (hud_ray, out rc_hit, Mathf.Infinity, 1 << LayerMask.NameToLayer ("HUD"))) {

    if (rc_hit.transform.gameObject == b_BackButton) {

        StopCoroutine ("EN_Loop");
        Application.LoadLevelAsync ("Other_Level"); 
                            }
                    }
            }

}

//This is what should happen when the video is done downloading
void AllDone ()

{
    Debug.Log ("Download Complete");
    Application.LoadLevelAsync ("Next_Level");
}

////This is the coroutine I created int he hopes that I could get the download to run in the background.
IEnumerator DOWNLOAD()
{
    Debug.Log("downloading_EN");
    WebClient client = new WebClient();
    client.DownloadFile ("http://ServerInfo.net/moviefile.mp4", Application.persistentDataPath + "/" + "moviefile.mp4");
    yield return null;

    AllDone ();

}

推荐答案

WebClient.DownloadFileAsync不锁定主线程（因此您的其他脚本仍将运行），并使用WebClient.DownloadFileCompleted事件来知道它何时完成。

Try using WebClient.DownloadFileAsync to not lock up the main thread (so your other scripts will still run) and use the WebClient.DownloadFileCompleted event to know when it's completed.

没有必要使用Coroutine来使用WebClient，并确保只调用此方法一次：

There's no need to use a Coroutine for using the WebClient and make sure to only call this Method once:

void DownloadFile()
{
    WebClient client = new WebClient();
    client.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler( DownloadFileCompleted );
    client.DownloadFileAsync ((new Uri ("http://ServerInfo.net/moviefile.mp4", Application.persistentDataPath + "/" + "moviefile.mp4"));
}

void DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{
    if (e.Error == null)
    {
        AllDone ();
    }
}

有关DownloadFileAsync的更多信息：

More information on DownloadFileAsync:

https://msdn.microsoft.com/en-us/library/system.net.webclient.downloadfileasync%28v=vs.110%29.aspx

和DownloadFileCompleted事件：

And DownloadFileCompleted Event:

https://msdn.microsoft.com/en-us/library/system.net.webclient.downloadfilecompleted%28v=vs.110%29 .aspx

这篇关于使用WebClient下载Unity3d中的大文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！