/// <summary>
/// 监视指定的后台下载任务
/// </summary>
/// <param name="download">后台下载任务</param>
private async Task HandleDownloadAsync(DownloadManage.HandleModel model)
{
try
{
DownloadProgress(model.downOp);
//进度监控
Progress <DownloadOperation> progressCallback = new Progress <DownloadOperation>(DownloadProgress);
await model.downOp.AttachAsync().AsTask(model.cts.Token, progressCallback);
//保存任务信息
// StorageFolder folder = ApplicationData.Current.LocalFolder;
StorageFolder DowFolder = await KnownFolders.VideosLibrary.CreateFolderAsync("Bili-Down", CreationCollisionOption.OpenIfExists);
StorageFile file = await DowFolder.GetFileAsync(model.Guid + ".bili");
//用Url编码是因为不支持读取中文名
//含会出现：在多字节的目标代码页中，没有此 Unicode 字符可以映射到的字符。错误
string path = WebUtility.UrlDecode(await FileIO.ReadTextAsync(file));
StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(path);
StorageFile files = await folder.CreateFileAsync(model.Guid + ".json", CreationCollisionOption.OpenIfExists); //await StorageFile.GetFileFromPathAsync(path+@"\" + model.Guid + ".json");
string json = await FileIO.ReadTextAsync(files);
DownloadManage.DownModel info = JsonConvert.DeserializeObject <DownloadManage.DownModel>(json);
info.downloaded = true;
string jsonInfo = JsonConvert.SerializeObject(info);
StorageFile fileWrite = await folder.CreateFileAsync(info.Guid + ".json", CreationCollisionOption.ReplaceExisting);
await FileIO.WriteTextAsync(fileWrite, jsonInfo);
//移除正在监控
HandleList.Remove(model.downModel.Guid);
GetDownOk_New();
}
catch (TaskCanceledException)
{
//取消通知
//ToastTemplateType toastTemplate = ToastTemplateType.ToastText01;
//XmlDocument toastXml = ToastNotificationManager.GetTemplateContent(toastTemplate);
//XmlNodeList toastTextElements = toastXml.GetElementsByTagName("text");
//IXmlNode toastNode = toastXml.SelectSingleNode("/toast");
//((XmlElement)toastNode).SetAttribute("duration", "short");
//toastTextElements[0].AppendChild(toastXml.CreateTextNode(String.Format("取消任务{0}", model.downModel.title)));
//ToastNotification toast = new ToastNotification(toastXml);
//ToastNotificationManager.CreateToastNotifier().Show(toast);
}
catch (Exception ex)
{
WebErrorStatus error = BackgroundTransferError.GetStatus(ex.HResult);
return;
}
finally
{
list_Downing.Items.Remove(model);
}
}
//进度发生变化时,通知更新UI
private void DownloadProgress(DownloadOperation op)
{
try
{
DownloadManage.HandleModel test = null;
foreach (DownloadManage.HandleModel item in list_Downing.Items)
{
if (item.downOp.Guid == op.Guid)
{
test = item;
}
}
if (list_Downing.Items.Contains(test))
{
((DownloadManage.HandleModel)list_Downing.Items[list_Downing.Items.IndexOf(test)]).Size = op.Progress.BytesReceived.ToString();
((DownloadManage.HandleModel)list_Downing.Items[list_Downing.Items.IndexOf(test)]).Status = op.Progress.Status.ToString();
((DownloadManage.HandleModel)list_Downing.Items[list_Downing.Items.IndexOf(test)]).Progress = ((double)op.Progress.BytesReceived / op.Progress.TotalBytesToReceive) * 100;
}
}
catch (Exception)
{
return;
}
}
