IEnumerator _DownloadAssetImpl(Mission mission)
{
mCurMission = mission;
string bundleName = mission.CurrentBundle.ToLower();
DownloadedCB cb_PerBundleLoaded = mission.PerloadedCB;
AllDownloadedCB cb_all = mission.AllLoadedCB;
AssetBundle bundle = GetCached(bundleName);
string url = "";
if (bundle == null)
{
// 尝试从本地读取文件
bool bLocalNew = IsLocalNewVersion(bundleName);
if (bLocalNew)
url = GetLocalPath(ly.AssetDependencyManager.GetPackagePath(bundleName));
else
url = GetHttpPath(ly.AssetDependencyManager.RealPath2PackagePath(bundleName));
// 如果本地已经更新，并且没有设置回调，则直接跳过
if (!bLocalNew || cb_PerBundleLoaded != null)
{
WWW downloading = new WWW(url);
mission.CurrentDownloading = downloading;
yield return downloading;
if (downloading.error != null)
{
UIHelper.ShowMessage("Download error:"+downloading.error+", file:"+url+", make sure your asset is in the main bundle.");
}
else
{
Debug.Log("Bundle has been downloaded! file:"+url);
// 有回调函数设置，才认为需要立即加载到内存
if (cb_PerBundleLoaded != null)
bundle = downloading.assetBundle;
// 如果远程下载了文件，则保存到本地
if (!bLocalNew)
{
string path = GetLocalPathNoPrefix(ly.AssetDependencyManager.GetPackagePath(bundleName));
string dir = System.IO.Path.GetDirectoryName(path);
if (!System.IO.Directory.Exists(dir))
System.IO.Directory.CreateDirectory(dir);
System.IO.FileStream stream = new System.IO.FileStream(path, System.IO.FileMode.Create);
stream.Write(downloading.bytes, 0, downloading.bytes.Length);
stream.Flush();
stream.Close();
string MD5 = GetMD5(downloading.bytes);
UpdateLocalMD5(bundleName, MD5);
// 每下载一个资源文件，都更新一下本地的VersionFile，防止中途退出又要重新下载
UpdateLocalVersionFile();
}
if (bundle != null)
mCacheBundle.Add(bundleName, bundle);
}
}
}
else
{
Debug.Log("Bundle has been loaded! file:"+bundleName);
}
if (cb_PerBundleLoaded != null && bundle == null)
{
Debug.LogError("No bundle!"+url);
}
mission.Done();
if (cb_PerBundleLoaded != null)
cb_PerBundleLoaded(bundleName, bundle, null, mission.mUserData);
if (!mission.IsCompleted())
{
this.StartCoroutine(_DownloadAssetImpl(mission));
}
else
{
if (cb_all != null)
cb_all(bundleName, mission.mUserData);
mMissionList.RemoveFirst();
if (mMissionList.Count > 0)
{
mission = mMissionList.First.Value;
this.StartCoroutine(_DownloadAssetImpl(mission));
}
}
}
