NegotiateStream::EndRead Method (IAsyncResult^)
Ends an asynchronous read operation that was started with a call to BeginRead.
Assembly: System (in System.dll)
Parameters
- asyncResult
-
Type:
System::IAsyncResult^
An IAsyncResult instance returned by a call to BeginRead
Return Value
Type: System::Int32A Int32 value that specifies the number of bytes read from the underlying stream.
| Exception | Condition |
|---|---|
| ArgumentNullException | asyncResult is null. |
| ArgumentException | The asyncResult was not created by a call to BeginRead. |
| InvalidOperationException | There is no pending read operation to complete. |
| IOException | The read operation failed. |
| InvalidOperationException | Authentication has not occurred. |
If the operation has not completed, this method blocks until it does.
To perform this operation synchronously, use the Read method.
You cannot call this method until you have successfully authenticated. To authenticate, call one of the AuthenticateAsClient, BeginAuthenticateAsClient, AuthenticateAsServer, or BeginAuthenticateAsServer methods.
The following code example demonstrates ending an asynchronous read operation. For an example that demonstrates starting the operation, see BeginRead.
static void EndReadCallback( IAsyncResult^ ar ) { // Get the saved data. ClientState^ cState = dynamic_cast<ClientState^>(ar->AsyncState); TcpClient^ clientRequest = cState->Client; NegotiateStream^ authStream = dynamic_cast<NegotiateStream^>(cState->AuthStream); // Get the buffer that stores the message sent by the client. int bytes = -1; // Read the client message. try { bytes = authStream->EndRead( ar ); cState->Message->Append( Encoding::UTF8->GetChars( cState->Buffer, 0, bytes ) ); if ( bytes != 0 ) { authStream->BeginRead( cState->Buffer, 0, cState->Buffer->Length, gcnew AsyncCallback( EndReadCallback ), cState ); return; } } catch ( Exception^ e ) { // A real application should do something // useful here, such as logging the failure. Console::WriteLine( L"Client message exception:" ); Console::WriteLine( e ); cState->Waiter->Set(); return; } IIdentity^ id = authStream->RemoteIdentity; Console::WriteLine( L"{0} says {1}", id->Name, cState->Message ); cState->Waiter->Set(); }
Available since 2.0