/// <summary>
/// do in a separate thread
/// 下载缩略图线程
/// </summary>
/// <param name="page"></param>
/// <param name="count"></param>
/// <param name="word"></param>
public void PreFetchPage(int page, int count, string word, ImageSite site)
{
(new Thread(new ThreadStart(() =>
{
try
{
preFetchedPage = site.GetPageString(page, count, word, proxy);
prePage = page;
preCount = count;
preWord = word;
preSite = site;
List <Img> imgs = site.GetImages(preFetchedPage, proxy);
//获得所有图片列表后反馈得到的数量
PreListLoaded(imgs.Count, null);
if (imgs.Count < 1)
{
return;
}
SessionClient sweb = new SessionClient();
SessionHeadersCollection shc = new SessionHeadersCollection();
shc.Accept = null;
shc.ContentType = SessionHeadersValue.ContentTypeAuto;
shc.Add("Accept-Ranges", "bytes");
shc.Referer = site.Referer;
imgs = site.FilterImg(imgs, MainWindow.MainW.MaskInt, MainWindow.MainW.MaskRes,
MainWindow.MainW.LastViewed, MainWindow.MainW.MaskViewed, true, false);
//预加载缩略图
foreach (HttpWebRequest req1 in imgReqs)
{
if (req1 != null)
{
req1.Abort();
}
}
preFetchedImg.Clear();
imgReqs.Clear();
//prefetch one by one
int cacheCount = CachedImgCount < imgs.Count ? CachedImgCount : imgs.Count;
for (int i = 0; i < cacheCount; i++)
{
WebResponse res = sweb.GetWebResponse(imgs[i].PreviewUrl, proxy, 9000, shc);
System.IO.Stream str = res.GetResponseStream();
if (!preFetchedImg.ContainsKey(imgs[i].PreviewUrl))
{
preFetchedImg.Add(imgs[i].PreviewUrl, MainWindow.MainW.CreateImageSrc(str));
}
}
}
catch
{
//Console.WriteLine("useless");
}
}))).Start();
}
/// <summary>
/// 下载，另一线程
/// </summary>
/// <param name="o"></param>
private void Download(object o)
{
DownloadTask task = (DownloadTask)o;
FileStream fs = null;
Stream str = null;
SessionClient sc = new SessionClient();
System.Net.WebResponse res = null;
double downed = 0;
DownloadItem item = downloadItemsDic[task.Url];
try
{
res = sc.GetWebResponse(
task.Url,
MainWindow.WebProxy,
task.NeedReferer
);
/////////开始写入文件
str = res.GetResponseStream();
byte[] bytes = new byte[5120];
fs = new FileStream(task.SaveLocation + DLEXT, FileMode.Create);
int bytesReceived = 0;
DateTime last = DateTime.Now;
int osize = str.Read(bytes, 0, bytes.Length);
downed = osize;
while (!task.IsStop && osize > 0)
{
fs.Write(bytes, 0, osize);
bytesReceived += osize;
DateTime now = DateTime.Now;
double speed = -1;
if ((now - last).TotalSeconds > 0.6)
{
speed = downed / (now - last).TotalSeconds / 1024.0;
downed = 0;
last = now;
}
Dispatcher.Invoke(new DownloadHandler(web_DownloadProgressChanged),
res.ContentLength, bytesReceived / (double)res.ContentLength * 100.0, task.Url, speed);
osize = str.Read(bytes, 0, bytes.Length);
downed += osize;
}
}
catch (Exception ex)
{
//Dispatcher.Invoke(new UIdelegate(delegate(object sender) { StopLoadImg(re.Key, re.Value); }), "");
task.IsStop = true;
Dispatcher.Invoke(new VoidDel(delegate()
{
//下载失败
if (downloadItemsDic.ContainsKey(task.Url))
{
item.StatusE = DLStatus.Failed;
item.Size = "下载失败";
WriteErrText(task.Url);
WriteErrText(task.SaveLocation);
WriteErrText(ex.Message + "\r\n");
try
{
if (fs != null)
{
fs.Close();
}
if (str != null)
{
str.Close();
}
if (res != null)
{
res.Close();
}
File.Delete(task.SaveLocation + DLEXT);
DelDLItemNullDirector(item);
}
catch { }
}
}));
}
finally
{
if (fs != null)
{
fs.Close();
}
if (str != null)
{
str.Close();
}
if (res != null)
{
res.Close();
}
}
if (task.IsStop)
{
//任务被取消
Dispatcher.Invoke(new VoidDel(delegate()
{
if (downloadItemsDic.ContainsKey(task.Url))
{
if (!dlerrtxt.Contains(item.Size))
{
item.StatusE = DLStatus.Cancel;
}
}
}));
try
{
File.Delete(task.SaveLocation + DLEXT);
DelDLItemNullDirector(item);
}
catch { }
}
else
{
//下载成功完成
Dispatcher.Invoke(new VoidDel(delegate()
{
try
{
//DownloadTask task1 = obj as DownloadTask;
//判断完整性
if (!item.NoVerify && 100 - item.Progress > 0.001)
{
task.IsStop = true;
item.StatusE = DLStatus.Failed;
item.Size = "下载未完成";
try
{
File.Delete(task.SaveLocation + DLEXT);
DelDLItemNullDirector(item);
}
catch { }
}
else
{
//修改后缀名
File.Move(task.SaveLocation + DLEXT, task.SaveLocation);
item.Progress = 100.0;
item.StatusE = DLStatus.Success;
//downloadItemsDic[task.Url].Size = (downed > 1048576
//? (downed / 1048576.0).ToString("0.00MB")
//: (downed / 1024.0).ToString("0.00KB"));
numSaved++;
}
}
catch { }
}));
}
//下载结束
Dispatcher.Invoke(new VoidDel(delegate()
{
webs.Remove(task.Url);
RefreshList();
}));
}