/// <summary>
/// 继续一个下载任务
/// </summary>
/// <param name="info"></param>
protected bool ResumeOneDownload(DownloadInfo info)
{
if (string.IsNullOrEmpty(info.RequestId)) return false;
var transferRequest = BackgroundTransferService.Find(info.RequestId);
if (transferRequest != null
&& transferRequest.TransferStatus == TransferStatus.Transferring)
{
try
{
_isDownloading = true;
info.DownloadState = DownloadState.Downloading;
HandleDownload(transferRequest, info, false);
return true;
}
catch (Exception ex)
{
DownloadFailture(info, ex.Message);
_isDownloading = false;
}
}
else
{
_isDownloading = true;
info.DownloadState = DownloadState.Downloading;
transferRequest = new BackgroundTransferRequest(new Uri(info.DownloadUri), new Uri(info.LocalFileName, UriKind.Relative));
HandleDownload(transferRequest, info, true);
return true;
}
return false;
}
/// <summary>
/// 开始下载一个新任务，此方法为后台线程调用
/// </summary>
/// <param name="info"></param>
protected void StartOneDownload(DownloadInfo info)
{
_isDownloading = true;
var destinationPath = string.Format("/shared/transfers/{0}", info.LocalFileName);
var destinationFile = new Uri(destinationPath, UriKind.Relative);
var transferRequest = new BackgroundTransferRequest(new Uri(info.DownloadUri), destinationFile);
info.LocalFileName = transferRequest.DownloadLocation.OriginalString;
HandleDownload(transferRequest, info, true);
}
/// <summary>
/// 暂停一个下载任务
/// </summary>
/// <param name="info"></param>
protected void PauseOneDownload(DownloadInfo info)
{
if (string.IsNullOrEmpty(info.RequestId)) return;
var transferRequest = BackgroundTransferService.Find(info.RequestId);
if (transferRequest != null
&& transferRequest.TransferStatus == TransferStatus.Transferring)
{
BackgroundTransferService.Remove(transferRequest);
transferRequest.Dispose();
info.DownloadState = DownloadState.Pause;
}
}
protected abstract void DownloadFailture(DownloadInfo info, string errMessage);
protected abstract void DownloadCompleted(DownloadInfo info);
protected abstract void DownloadProgress(BackgroundTransferRequest request, DownloadInfo info);
protected void CancelDownload(DownloadInfo info)
{
if (string.IsNullOrEmpty(info.RequestId)) return;
var transferRequest = BackgroundTransferService.Find(info.RequestId);
if (transferRequest != null)
{
BackgroundTransferService.Remove(transferRequest);
transferRequest.Dispose();
}
}
/// <summary>
/// 暂停一个下载
/// </summary>
/// <param name="info"></param>
public void PauseDownload(DownloadInfo info)
{
PauseOneDownload(info);
ReadyToNextDownload();
}
protected override void DownloadFailture(DownloadInfo info, string errMessage)
{
var handler = _dispatcher.BeginInvoke(() =>
{
info.DownloadState = DownloadState.DownloadError;
ReadyToNextDownload();
});
}
private void ReadyToDownload(DownloadInfo downInfo)
{
var result = ResumeOneDownload(downInfo);
if (!result)
{
_isDownloading = true;
downInfo.DownloadState = DownloadState.Downloading;
var playInfoFactory = new Play2InfoFactory(true, true);
playInfoFactory.HttpSucessHandler += (o, e) =>
{
downInfo.DownloadUri = playInfoFactory.CreatePlayUri();
StartOneDownload(downInfo);
DownloadingViewModel.Instance.SubmitChange();
};
playInfoFactory.HttpFailorTimeOut = () =>
{
var handler = _dispatcher.BeginInvoke(() =>
{
downInfo.DownloadState = DownloadState.PlayInfoError;
ReadyToNextDownload();
});
};
playInfoFactory.DownLoadDatas(downInfo.ChannelId);
}
}
protected override void DownloadCompleted(DownloadInfo info)
{
WAYLocalFactory.Instance.AddDownloadCount();
try
{
using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
var localFile = string.Format("/PersonalCenter/MyDownload/{0}.mp4", info.Title);
if (isoStore.FileExists(localFile))
isoStore.DeleteFile(localFile);
isoStore.MoveFile(info.LocalFileName, localFile);
info.LocalFileName = localFile;
}
}
catch
{ }
var handler = _dispatcher.BeginInvoke(() =>
{
info.DownloadState = DownloadState.Downloaded;
DownloadingViewModel.Instance.DeleteRecord(info);
DownloadedViewModel.Instance.InsertRecord(info);
DownloadingChange();
ReadyToNextDownload();
});
}
protected override void DownloadProgress(BackgroundTransferRequest request, DownloadInfo info)
{
var handler = _dispatcher.BeginInvoke(() =>
{
double percent = 0;
if (request.TotalBytesToReceive > 0)
percent = request.BytesReceived * 100 / request.TotalBytesToReceive;
if (request.TotalBytesToReceive != info.TotalBytesReceive)
info.TotalBytesReceive = request.TotalBytesToReceive;
info.BytesReceived = request.BytesReceived;
info.DownloadPercent = percent;
DownloadingViewModel.Instance.SubmitChange();
});
}
/// <summary>
/// 处理一个下载
/// </summary>
/// <param name="downInfo"></param>
public void HandleDownload(DownloadInfo downInfo)
{
switch (downInfo.DownloadState)
{
case DownloadState.Downloading:
DownloadViewModel.Instance.PauseDownload(downInfo);
break;
case DownloadState.Pause:
case DownloadState.PlayInfoError:
case DownloadState.DownloadError:
DownloadViewModel.Instance.ResumeDownload(downInfo);
break;
case DownloadState.Await:
downInfo.DownloadState = DownloadState.Pause;
break;
case DownloadState.WaitingForWiFi:
case DownloadState.WaitingForExternalPower:
DownloadViewModel.Instance.RestartOneDonwload(downInfo);
break;
}
}
/// <summary>
/// 重新启动一个下载任务
/// </summary>
/// <param name="info"></param>
/// <returns></returns>
protected bool RestartOneDonwload(DownloadInfo info)
{
if (string.IsNullOrEmpty(info.RequestId)) return false;
var transferRequest = BackgroundTransferService.Find(info.RequestId);
if (transferRequest != null
&& transferRequest.TransferStatus == TransferStatus.Transferring)
{
try
{
_isDownloading = true;
info.DownloadState = DownloadState.Downloading;
HandleDownload(transferRequest, info, false);
return true;
}
catch (Exception ex)
{
DownloadFailture(info, ex.Message);
_isDownloading = false;
}
}
return false;
}
private void HandleDownload(BackgroundTransferRequest transferRequest, DownloadInfo info, bool isAddQueue)
{
transferRequest.TransferStatusChanged += (o, e) =>
{
switch(e.Request.TransferStatus)
{
case TransferStatus.Completed:
if (e.Request.StatusCode == 200 || e.Request.StatusCode == 206)
{
DownloadCompleted(info);
BackgroundTransferService.Remove(e.Request);
e.Request.Dispose();
}
break;
case TransferStatus.WaitingForWiFi:
case TransferStatus.WaitingForNonVoiceBlockingNetwork:
info.DownloadState = DownloadState.WaitingForWiFi;
Utils.TileUtils.CreateBasicToast("需要在WiFi环境下才能下载");
break;
case TransferStatus.WaitingForExternalPower:
case TransferStatus.WaitingForExternalPowerDueToBatterySaverMode:
info.DownloadState = DownloadState.WaitingForExternalPower;
Utils.TileUtils.CreateBasicToast("需要外接电源才能下载");
break;
default:
break;
}
};
transferRequest.TransferProgressChanged += (o, e) =>
{
DownloadProgress(e.Request, info);
};
if (isAddQueue)
{
transferRequest.Method = "GET";
info.RequestId = transferRequest.RequestId;
try
{
if (BackgroundTransferService.Find(info.RequestId) == null)
BackgroundTransferService.Add(transferRequest);
}
catch (Exception ex)
{
_isDownloading = false;
DownloadFailture(info, ex.Message);
}
}
}
private void ApplicationBarDownload_Click(object sender, EventArgs e)
{
try
{
if (PersonalFactory.Instance.Logined)
{
var downinfos = new List<DownloadInfo>(_downloadList.Count);
foreach (var downInfo in _downloadList)
{
var index = ChannelUtils.CreateProgramIndex(downInfo.Index, _dataSource);
downInfo.IsSelected = false;
downInfo.IsDownloading = true;
var down = new DownloadInfo()
{
TypeId = _dataSource.Type,
ParentId = _dataSource.Id,
ParentName = _dataSource.Title,
ProgramIndex = downInfo.Index,
ChannelId = downInfo.ChannelId,
ImageUri = _dataSource.ImageUri,
DownloadState = DownloadState.Await,
Title = ChannelUtils.CreateChannelTitle(index, _dataSource, false)
};
down.LocalFileName = string.Format("{0}.mp4", down.Title);
downinfos.Add(down);
}
DownloadViewModel.Instance.AddDownloads(downinfos);
if (_downloadList.Count > 0)
TileUtils.CreateBasicToast("已加入下载，请到个人中心查看");
_downloadList.Clear();
_downloadBar.IsEnabled = false;
}
else
{
TileUtils.CreateBasicToast("请先至个人中心登录");
}
}
catch
{
TileUtils.CreateBasicToast("加入下载失败");
}
}
/// <summary>
/// 继续一个下载
/// </summary>
/// <param name="info"></param>
public void ResumeDownload(DownloadInfo info)
{
if (_isDownloading)
{
info.DownloadState = DownloadState.Await;
}
else
{
ReadyToDownload(info);
}
}
