WCF Stream.Read always returns 0 in client
- by G_M
I've spent most of my day trying to figure out why this isn't working. I have a WCF service that streams an object to the client. The client is then supposed to write the file to its disk. But when I call stream.Read(buffer, 0, bufferLength) it always returns 0. Here's my code:
namespace StreamServiceNS
{
[ServiceContract]
public interface IStreamService
{
[OperationContract]
Stream downloadStreamFile();
}
}
class StreamService : IStreamService
{
public Stream downloadStreamFile()
{
ISSSteamFile sFile = getStreamFile();
BinaryFormatter bf = new BinaryFormatter();
MemoryStream stream = new MemoryStream();
bf.Serialize(stream, sFile);
return stream;
}
}
Service config file:
<system.serviceModel>
<services>
<service name="StreamServiceNS.StreamService">
<endpoint address="stream" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IStreamService"
name="BasicHttpEndpoint_IStreamService" contract="SWUpdaterService.ISWUService" />
</service>
</services>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_IStreamService" transferMode="StreamedResponse"
maxReceivedMessageSize="209715200"></binding>
</basicHttpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceThrottling maxConcurrentCalls ="100" maxConcurrentSessions="400"/>
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
Client:
TestApp.StreamServiceRef.StreamServiceClient client = new StreamServiceRef.StreamServiceClient();
try
{
Stream stream = client.downloadStreamFile();
int bufferLength = 8 * 1024;
byte[] buffer = new byte[bufferLength];
FileStream fs = new FileStream(@"C:\test\testFile.exe", FileMode.Create, FileAccess.Write);
int bytesRead;
while ((bytesRead = stream.Read(buffer, 0, bufferLength)) > 0)
{
fs.Write(buffer, 0, bytesRead);
}
stream.Close();
fs.Close();
}
catch (Exception e) { Console.WriteLine("Error: " + e.Message); }
Client app.config:
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpEndpoint_IStreamService" maxReceivedMessageSize="209715200" transferMode="StreamedResponse">
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="http://[server]/StreamServices/streamservice.svc/stream"
binding="basicHttpBinding" bindingConfiguration="BasicHttpEndpoint_IStreamService"
contract="StreamServiceRef.IStreamService" name="BasicHttpEndpoint_IStreamService" />
</client>
</system.serviceModel>
(some code clipped for brevity)
I've read everything I can find on making WCF streaming services, and my code looks no different than theirs. I can replace the streaming with buffering and send an object that way fine, but when I try to stream, the client always sees the stream as "empty". The testFile.exe gets created, but its size is 0KB.
What am I missing?
