// 加入一个获取对象文件的请求
// parameters:
// strFileName 临时文件名。可为空，功能中会自动给出一个临时文件名
public void AsyncGetObjectFile(string strServerUrl,
string strUserName,
string strObjectPath,
string strFileName,
object tag)
{
TraceObject trace = new TraceObject();
trace.ServerUrl = strServerUrl;
trace.UserName = strUserName;
trace.ObjectPath = strObjectPath;
trace.FileName = strFileName;
trace.Tag = tag;
lock (_trace_images)
{
_trace_images.Add(trace);
}
}
// 下载图像文件
void DownloadImages()
{
string strError = "";
TraceObject info = null;
lock (_trace_images)
{
if (_trace_images.Count == 0)
{
return;
}
info = _trace_images[0];
_trace_images.RemoveAt(0);
}
if (string.IsNullOrEmpty(info.FileName) == true)
{
info.FileName = GetTempFileName();
}
// http 协议的图像文件
if (StringUtil.IsHttpUrl(info.ObjectPath) == true)
{
// 先从 cache 中找
if (_localFileCache != null)
{
string strLocalFile = (string)_localFileCache[info.ObjectPath];
if (string.IsNullOrEmpty(strLocalFile) == false)
{
if (string.IsNullOrEmpty(info.FileName) == false)
{
DeleteTempFile(info.FileName);
info.FileName = "";
}
info.FileName = strLocalFile;
goto END1;
}
}
if (_webClient == null)
{
_webClient = new MyWebClient();
_webClient.Timeout = 5000;
_webClient.CachePolicy = new System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.CacheIfAvailable);
}
try
{
_webClient.DownloadFile(new Uri(info.ObjectPath, UriKind.Absolute), info.FileName);
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError)
{
var response = ex.Response as HttpWebResponse;
if (response != null)
{
if (response.StatusCode == HttpStatusCode.NotFound)
{
strError = ex.Message;
goto ERROR1;
}
}
}
strError = ex.Message;
goto ERROR1;
}
catch (Exception ex)
{
strError = ExceptionUtil.GetAutoText(ex);
goto ERROR1;
}
_localFileCache[info.ObjectPath] = info.FileName;
}
else
{
// dp2library 协议的对象资源
LibraryChannel channel = this.ChannelPool.GetChannel(info.ServerUrl, info.UserName);
try
{
byte[] baOutputTimeStamp = null;
string strMetaData = "";
string strTempOutputPath = "";
long lRet = channel.GetRes(
null,
info.ObjectPath,
info.FileName,
"content,data,metadata,timestamp,outputpath,gzip", // 2017/10/7 增加 gzip
out strMetaData,
out baOutputTimeStamp,
out strTempOutputPath,
out strError);
if (lRet == -1)
{
strError = "下载资源文件失败，原因: " + strError;
goto ERROR1;
}
_localFileCache[info.ObjectPath] = info.FileName;
}
finally
{
this.ChannelPool.ReturnChannel(channel); // 2016/6/6
}
}
END1:
// 通知
if (this.GetObjectComplete != null)
{
GetObjectCompleteEventArgs e = new GetObjectCompleteEventArgs();
e.TraceObject = info;
this.GetObjectComplete(this, e);
}
this.Activate();
return;
ERROR1:
// 通知
if (this.GetObjectComplete != null)
{
GetObjectCompleteEventArgs e = new GetObjectCompleteEventArgs();
e.TraceObject = info;
e.ErrorInfo = strError;
this.GetObjectComplete(this, e);
}
}
// 加入一个获取对象文件的请求
// parameters:
// strFileName 临时文件名。可为空，功能中会自动给出一个临时文件名
public void AsyncGetObjectFile(string strServerUrl,
string strUserName,
string strObjectPath,
string strFileName,
object tag)
{
TraceObject trace = new TraceObject();
trace.ServerUrl = strServerUrl;
trace.UserName = strUserName;
trace.ObjectPath = strObjectPath;
trace.FileName = strFileName;
trace.Tag = tag;
lock (_trace_images)
{
_trace_images.Add(trace);
}
}