public bool ReceiveFromAsync(SocketAsyncEventArgs e)
{
bool retval;
if (s_loggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "ReceiveFromAsync", "");
}
if (CleanedUp)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (e == null)
{
throw new ArgumentNullException("e");
}
if (e.RemoteEndPoint == null)
{
throw new ArgumentNullException("RemoteEndPoint");
}
if (!CanTryAddressFamily(e.RemoteEndPoint.AddressFamily))
{
throw new ArgumentException(SR.Format(SR.net_InvalidEndPointAddressFamily, e.RemoteEndPoint.AddressFamily, _addressFamily), "RemoteEndPoint");
}
// We don't do a CAS demand here because the contents of remoteEP aren't used by
// WSARecvFrom; all that matters is that we generate a unique-to-this-call SocketAddress
// with the right address family.
EndPoint endPointSnapshot = e.RemoteEndPoint;
e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);
// DualMode sockets may have updated the endPointSnapshot, and it has to have the same AddressFamily as
// e.m_SocketAddres for Create to work later.
e.RemoteEndPoint = endPointSnapshot;
// Prepare for the native call.
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
// Make the native call.
SocketFlags flags;
int bytesTransferred;
SocketError socketError;
try
{
socketError = e.DoOperationReceiveFrom(_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, "ReceiveFromAsync", retval);
}
return retval;
}
/// <summary>
/// Begins to asynchronously receive data from a specified network device.
/// </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.ArgumentNullException">The <see cref="P:System.Net.Sockets.SocketAsyncEventArgs.RemoteEndPoint"/> cannot be null.</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. </exception>
public bool ReceiveFromAsync(SocketAsyncEventArgs e)
{
if (Socket.s_LoggingEnabled)
Logging.Enter(Logging.Sockets, (object) this, "ReceiveFromAsync", "");
if (this.CleanedUp)
throw new ObjectDisposedException(this.GetType().FullName);
if (e.RemoteEndPoint == null)
throw new ArgumentNullException("RemoteEndPoint");
if (!this.CanTryAddressFamily(e.RemoteEndPoint.AddressFamily))
{
throw new ArgumentException(SR.GetString("net_InvalidEndPointAddressFamily", (object) e.RemoteEndPoint.AddressFamily, (object) this.addressFamily), "RemoteEndPoint");
}
else
{
EndPoint remoteEndPoint = e.RemoteEndPoint;
e.m_SocketAddress = this.SnapshotAndSerialize(ref remoteEndPoint);
e.RemoteEndPoint = remoteEndPoint;
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
this.BindToCompletionPort();
SocketFlags socketFlags = e.m_SocketFlags;
int bytesTransferred;
SocketError socketError;
try
{
socketError = e.m_Buffer == null ? UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(this.m_Handle, e.m_WSABufferArray, e.m_WSABufferArray.Length, out bytesTransferred, out socketFlags, e.m_PtrSocketAddressBuffer, e.m_PtrSocketAddressBufferSize, e.m_PtrNativeOverlapped, IntPtr.Zero) : UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(this.m_Handle, ref e.m_WSABuffer, 1, out bytesTransferred, out socketFlags, e.m_PtrSocketAddressBuffer, e.m_PtrSocketAddressBufferSize, (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, "ReceiveFromAsync", (object) (bool) (flag ? 1 : 0));
return flag;
}
}
//
// ReceiveFromAsync
//
public bool ReceiveFromAsync(SocketAsyncEventArgs e) {
bool retval;
if(s_LoggingEnabled) Logging.Enter(Logging.Sockets, this, "ReceiveFromAsync", "");
// Throw if socket disposed
if(CleanedUp) {
throw new ObjectDisposedException(GetType().FullName);
}
// Throw if remote endpoint property is null.
if(e.RemoteEndPoint == null) {
throw new ArgumentNullException("RemoteEndPoint");
}
if(!CanTryAddressFamily(e.RemoteEndPoint.AddressFamily)) {
throw new ArgumentException(SR.GetString(SR.net_InvalidEndPointAddressFamily,
e.RemoteEndPoint.AddressFamily, addressFamily), "RemoteEndPoint");
}
// We don't do a CAS demand here because the contents of remoteEP aren't used by
// WSARecvFrom; all that matters is that we generate a unique-to-this-call SocketAddress
// with the right address family
EndPoint endPointSnapshot = e.RemoteEndPoint;
e.m_SocketAddress = SnapshotAndSerialize(ref endPointSnapshot);
// DualMode may have updated the endPointSnapshot, and it has to have the same AddressFamily as
// e.m_SocketAddres for Create to work later.
e.RemoteEndPoint = endPointSnapshot;
// Prepare for the native call.
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
BindToCompletionPort();
// Make the native call.
SocketFlags flags = e.m_SocketFlags;
int bytesTransferred;
SocketError socketError;
try {
if(e.m_Buffer != null) {
socketError = UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(
m_Handle,
ref e.m_WSABuffer,
1,
out bytesTransferred,
ref flags,
e.m_PtrSocketAddressBuffer,
e.m_PtrSocketAddressBufferSize,
e.m_PtrNativeOverlapped,
IntPtr.Zero);
} else {
socketError = UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(
m_Handle,
e.m_WSABufferArray,
e.m_WSABufferArray.Length,
out bytesTransferred,
ref flags,
e.m_PtrSocketAddressBuffer,
e.m_PtrSocketAddressBufferSize,
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, "ReceiveFromAsync", retval);
return retval;
}
public bool ReceiveFromAsync(SocketAsyncEventArgs e)
{
bool flag;
int num;
SocketError error;
if (s_LoggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "ReceiveFromAsync", "");
}
if (this.CleanedUp)
{
throw new ObjectDisposedException(base.GetType().FullName);
}
if (e.RemoteEndPoint == null)
{
throw new ArgumentNullException("RemoteEndPoint");
}
if (e.RemoteEndPoint.AddressFamily != this.addressFamily)
{
throw new ArgumentException(SR.GetString("net_InvalidEndPointAddressFamily", new object[] { e.RemoteEndPoint.AddressFamily, this.addressFamily }), "RemoteEndPoint");
}
EndPoint remoteEndPoint = e.RemoteEndPoint;
e.m_SocketAddress = this.SnapshotAndSerialize(ref remoteEndPoint);
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
this.BindToCompletionPort();
SocketFlags socketFlags = e.m_SocketFlags;
try
{
if (e.m_Buffer != null)
{
error = UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(this.m_Handle, ref e.m_WSABuffer, 1, out num, ref socketFlags, e.m_PtrSocketAddressBuffer, e.m_PtrSocketAddressBufferSize, e.m_PtrNativeOverlapped, IntPtr.Zero);
}
else
{
error = UnsafeNclNativeMethods.OSSOCK.WSARecvFrom(this.m_Handle, e.m_WSABufferArray, e.m_WSABufferArray.Length, out num, ref socketFlags, e.m_PtrSocketAddressBuffer, e.m_PtrSocketAddressBufferSize, 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, "ReceiveFromAsync", flag);
}
return flag;
}
