public bool ReceiveAsync(SocketAsyncEventArgs e) { bool retval; if (s_loggingEnabled) { Logging.Enter(Logging.Sockets, this, "ReceiveAsync", ""); } if (CleanedUp) { throw new ObjectDisposedException(GetType().FullName); } if (e == null) { throw new ArgumentNullException("e"); } // Prepare for the native call. e.StartOperationCommon(this); e.StartOperationReceive(); // Local vars for sync completion of native call. SocketFlags flags; int bytesTransferred; SocketError socketError; // Wrap native methods with try/catch so event args object can be cleaned up. try { socketError = e.DoOperationReceive(_handle, out flags, out bytesTransferred); } catch (Exception ex) { // Clear in-use flag on event args object. e.Complete(); throw ex; } // Handle completion when completion port is not posted. if (socketError != SocketError.Success && socketError != SocketError.IOPending) { e.FinishOperationSyncFailure(socketError, bytesTransferred, flags); retval = false; } else { retval = true; } if (s_loggingEnabled) { Logging.Exit(Logging.Sockets, this, "ReceiveAsync", retval); } return retval; }
/// <summary> /// Begins an asynchronous request to receive data from a connected <see cref="T:System.Net.Sockets.Socket"/> object. /// </summary> /// /// <returns> /// Returns true if the I/O operation is pending. The <see cref="E:System.Net.Sockets.SocketAsyncEventArgs.Completed"/> event on the <paramref name="e"/> parameter will be raised upon completion of the operation. Returns false if the I/O operation completed synchronously. In this case, The <see cref="E:System.Net.Sockets.SocketAsyncEventArgs.Completed"/> event on the <paramref name="e"/> parameter will not be raised and the <paramref name="e"/> object passed as a parameter may be examined immediately after the method call returns to retrieve the result of the operation. /// </returns> /// <param name="e">The <see cref="T:System.Net.Sockets.SocketAsyncEventArgs"/> object to use for this asynchronous socket operation.</param><exception cref="T:System.ArgumentException">An argument was invalid. The <see cref="P:System.Net.Sockets.SocketAsyncEventArgs.Buffer"/> or <see cref="P:System.Net.Sockets.SocketAsyncEventArgs.BufferList"/> properties on the <paramref name="e"/> parameter must reference valid buffers. One or the other of these properties may be set, but not both at the same time.</exception><exception cref="T:System.InvalidOperationException">A socket operation was already in progress using the <see cref="T:System.Net.Sockets.SocketAsyncEventArgs"/> object specified in the <paramref name="e"/> parameter.</exception><exception cref="T:System.NotSupportedException">Windows XP or later is required for this method.</exception><exception cref="T:System.ObjectDisposedException">The <see cref="T:System.Net.Sockets.Socket"/> has been closed. </exception><exception cref="T:System.Net.Sockets.SocketException">An error occurred when attempting to access the socket. See the Remarks section for more information. </exception> public bool ReceiveAsync(SocketAsyncEventArgs e) { if (Socket.s_LoggingEnabled) Logging.Enter(Logging.Sockets, (object) this, "ReceiveAsync", ""); if (this.CleanedUp) throw new ObjectDisposedException(this.GetType().FullName); e.StartOperationCommon(this); e.StartOperationReceive(); this.BindToCompletionPort(); SocketFlags socketFlags = e.m_SocketFlags; int bytesTransferred; SocketError socketError; try { socketError = e.m_Buffer == null ? UnsafeNclNativeMethods.OSSOCK.WSARecv(this.m_Handle, e.m_WSABufferArray, e.m_WSABufferArray.Length, out bytesTransferred, out socketFlags, (SafeHandle) e.m_PtrNativeOverlapped, IntPtr.Zero) : UnsafeNclNativeMethods.OSSOCK.WSARecv(this.m_Handle, ref e.m_WSABuffer, 1, out bytesTransferred, out socketFlags, (SafeHandle) e.m_PtrNativeOverlapped, IntPtr.Zero); } catch (Exception ex) { e.Complete(); throw ex; } if (socketError != SocketError.Success) socketError = (SocketError) Marshal.GetLastWin32Error(); bool flag; if (socketError != SocketError.Success && socketError != SocketError.IOPending) { e.FinishOperationSyncFailure(socketError, bytesTransferred, socketFlags); flag = false; } else flag = true; if (Socket.s_LoggingEnabled) Logging.Exit(Logging.Sockets, (object) this, "ReceiveAsync", (object) (bool) (flag ? 1 : 0)); return flag; }
// // ReceiveAsync // public bool ReceiveAsync(SocketAsyncEventArgs e) { bool retval; if(s_LoggingEnabled) Logging.Enter(Logging.Sockets, this, "ReceiveAsync", ""); // Throw if socket disposed if(CleanedUp) { throw new ObjectDisposedException(GetType().FullName); } // Prepare for the native call. e.StartOperationCommon(this); e.StartOperationReceive(); BindToCompletionPort(); // Local vars for [....] completion of native call. SocketFlags flags = e.m_SocketFlags; int bytesTransferred; SocketError socketError; // Wrap native methods with try/catch so event args object can be cleaned up try { if(e.m_Buffer != null) { // Single buffer case socketError = UnsafeNclNativeMethods.OSSOCK.WSARecv( m_Handle, ref e.m_WSABuffer, 1, out bytesTransferred, ref flags, e.m_PtrNativeOverlapped, IntPtr.Zero); } else { // Multi buffer case socketError = UnsafeNclNativeMethods.OSSOCK.WSARecv( m_Handle, e.m_WSABufferArray, e.m_WSABufferArray.Length, out bytesTransferred, ref flags, e.m_PtrNativeOverlapped, IntPtr.Zero); } } catch(Exception ex) { // clear in-use on event arg object e.Complete(); throw ex; } // Native method emits single catch-all error code when error occurs. // Must get Win32 error for specific error code. if(socketError != SocketError.Success) { socketError = (SocketError)Marshal.GetLastWin32Error(); } // Handle completion when completion port is not posted. if(socketError != SocketError.Success && socketError != SocketError.IOPending) { e.FinishOperationSyncFailure(socketError, bytesTransferred, flags); retval = false; } else { retval = true; } if(s_LoggingEnabled) Logging.Exit(Logging.Sockets, this, "ReceiveAsync", retval); return retval; }
public bool ReceiveAsync(SocketAsyncEventArgs e) { bool flag; int num; SocketError error; if (s_LoggingEnabled) { Logging.Enter(Logging.Sockets, this, "ReceiveAsync", ""); } if (this.CleanedUp) { throw new ObjectDisposedException(base.GetType().FullName); } e.StartOperationCommon(this); e.StartOperationReceive(); this.BindToCompletionPort(); SocketFlags socketFlags = e.m_SocketFlags; try { if (e.m_Buffer != null) { error = UnsafeNclNativeMethods.OSSOCK.WSARecv(this.m_Handle, ref e.m_WSABuffer, 1, out num, ref socketFlags, e.m_PtrNativeOverlapped, IntPtr.Zero); } else { error = UnsafeNclNativeMethods.OSSOCK.WSARecv(this.m_Handle, e.m_WSABufferArray, e.m_WSABufferArray.Length, out num, ref socketFlags, e.m_PtrNativeOverlapped, IntPtr.Zero); } } catch (Exception exception) { e.Complete(); throw exception; } if (error != SocketError.Success) { error = (SocketError) Marshal.GetLastWin32Error(); } if ((error != SocketError.Success) && (error != SocketError.IOPending)) { e.FinishOperationSyncFailure(error, num, socketFlags); flag = false; } else { flag = true; } if (s_LoggingEnabled) { Logging.Exit(Logging.Sockets, this, "ReceiveAsync", flag); } return flag; }