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;
}
