public void Download(string url, UInt32 requestId)
{
//判断文件是否存在
string fileName = m_saveFolder + url.Substring(url.LastIndexOf("/") + 1);
if (File.Exists(fileName))
{
Debug.WriteLine("File already download " + fileName);
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = fileName;
DownloadEvent(this, args);
return;
}
try
{
HttpWebRequest req = CreateRequest(url, "GET");
WebAsyncObject webObject = new WebAsyncObject();
webObject.request = req;
webObject.requestId = requestId;
webObject.webClient = this;
req.BeginGetResponse(new AsyncCallback(onDownloadResponse), webObject);
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = "";
DownloadEvent(this, args);
}
}
static void OnResponse(IAsyncResult ar)
{
//Debug.WriteLine("OnResponse 1:" + System.Threading.Thread.CurrentThread.ManagedThreadId);
var webObject = (WebAsyncObject)ar.AsyncState;
var request = webObject.request;
var requestId = webObject.requestId;
var webClient = webObject.webClient;
HttpWebResponse response = null;
Stream stream = null;
StreamReader sr = null;
string result = "";
try
{
response = (HttpWebResponse)request.EndGetResponse(ar);
stream = response.GetResponseStream();
sr = new StreamReader(stream, Encoding.UTF8);
result = sr.ReadToEnd();
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
}
finally
{
if (sr != null)
{
sr.Close();
}
if (stream != null)
{
stream.Close();
}
if (response != null)
{
response.Close();
}
request.Abort();
}
//Debug.WriteLine("OnResponse 2:" + System.Threading.Thread.CurrentThread.ManagedThreadId);
if (webClient.DownloadEvent != null)
{
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = result;
webClient.DownloadEvent(webClient, args);
}
}
public void Get(string url, UInt32 requestId)
{
//Debug.WriteLine("Get " + System.Threading.Thread.CurrentThread.ManagedThreadId);
try
{
HttpWebRequest req = CreateRequest(url, "GET");
WebAsyncObject webObject = new WebAsyncObject();
webObject.request = req;
webObject.requestId = requestId;
webObject.webClient = this;
req.BeginGetResponse(new AsyncCallback(OnResponse), webObject);
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = "";
DownloadEvent(this, args);
}
}
public void Post(string url, string postData, UInt32 requestId)
{
//Debug.WriteLine("Post " + System.Threading.Thread.CurrentThread.ManagedThreadId);
try
{
HttpWebRequest req = CreateRequest(url, "POST");
byte[] bs = Encoding.ASCII.GetBytes(postData);
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;
if (referer.Length > 0)
{
req.Referer = referer;
}
req.Accept = "*/*";
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
reqStream.Close();
}
WebAsyncObject webObject = new WebAsyncObject();
webObject.request = req;
webObject.requestId = requestId;
webObject.webClient = this;
req.BeginGetResponse(new AsyncCallback(OnResponse), webObject);
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = "";
DownloadEvent(this, args);
}
}
private void onDownloadEvent(object sender, DownloadEventArgs e)
{
onDownload(e);//切换线程
}
private void onDownload(DownloadEventArgs e)
{
// InvokeRequired需要比较调用线程ID和创建线程ID
// 如果它们不相同则返回true
if (m_invokeObj.InvokeRequired)
{
Debug.WriteLine("onDownload 1:" + System.Threading.Thread.CurrentThread.ManagedThreadId);
var d = new OnDownloadCallback(onDownload);
m_invokeObj.Invoke(d, new object[] { e });
}
else
{
Debug.WriteLine("onDownload 2:" + System.Threading.Thread.CurrentThread.ManagedThreadId);
var result = e.result;
var requestId = e.requestId;
var searchInfo = getSearchType(requestId);
if (searchInfo == null)
{
Debug.WriteLine("Warning: requst not exist id:" + requestId + " result:" + result);
return;
}
var searchType = searchInfo.searchType;
var queueId = searchInfo.queueId;
Debug.WriteLine("request id:" + requestId + " que:" + queueId + " result:" + result + " searchType" + searchType);
Song song = null;
string songPath = "";
switch (searchType)
{
case SearchType.Invalid:
break;
case SearchType.SongList:
var songList = JsonHelper.getSongList(result);
if (songList.Count > 0)
{
song = songList[0]; //只下载第一首歌
}
break;
case SearchType.SongInfo:
song = JsonHelper.getSong(result);
if (song != null)
{
var quality = song.Quality;
if (quality == null)
{
song = null;
}
}
break;
case SearchType.SongDownload:
songPath = result;
break;
default:
break;
}
var resultInfo = new SearchResult();
resultInfo.SongInfo = song;
resultInfo.QueueId = queueId;
resultInfo.SongPath = songPath;
if (SearchResultEvent != null)
{
SearchResultEvent(resultInfo);
}
}
}
static void onDownloadResponse(IAsyncResult ar)
{
var webObject = (WebAsyncObject)ar.AsyncState;
var request = webObject.request;
var requestId = webObject.requestId;
var webClient = webObject.webClient;
HttpWebResponse response = null;
Stream stream = null;
FileStream fs = null;
var url = request.RequestUri;
var urlStr = url.AbsoluteUri;
string fileName = webClient.m_saveFolder + urlStr.Substring(urlStr.LastIndexOf("/") + 1);
string tmpFileName = fileName + webClient.m_tmpFileExtName;
bool isError = false;
if (File.Exists(fileName))
{
Debug.WriteLine("Error: file already exist:" + fileName);
isError = true;
}
if (File.Exists(tmpFileName))
{
Debug.WriteLine("Error: tmp file already exist:" + tmpFileName);
isError = true;
}
try
{
if (!isError)
{
response = (HttpWebResponse)request.EndGetResponse(ar);
stream = response.GetResponseStream();
byte[] buffer = new byte[32 * 1024];
int bytesProcessed = 0;
fs = File.Create(tmpFileName);
int bytesRead;
do
{
bytesRead = stream.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, bytesRead);
bytesProcessed += bytesRead;
}while (bytesRead > 0);
}
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
isError = true;
}
finally
{
if (fs != null)
{
fs.Flush(); fs.Close();
}
if (stream != null)
{
stream.Close();
}
if (response != null)
{
response.Close();
}
request.Abort();
if (isError) //出错了
{
//删除文件
if (File.Exists(tmpFileName))
{
File.Delete(tmpFileName);
}
fileName = "";
}
else
{
if (File.Exists(tmpFileName))
{
File.Move(tmpFileName, fileName);
}
else
{
fileName = "";
}
}
}
if (webClient.DownloadEvent != null)
{
DownloadEventArgs args = new DownloadEventArgs();
args.requestId = requestId;
args.result = fileName;
webClient.DownloadEvent(webClient, args);
}
}