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Socket.IOControl Method (IOControlCode, Byte[], Byte[])

Sets low-level operating modes for the Socket using the IOControlCode enumeration to specify control codes.

Namespace: System.Net.Sockets
Assembly: System (in system.dll)

public int IOControl (
	IOControlCode ioControlCode,
	byte[] optionInValue,
	byte[] optionOutValue
)
public int IOControl (
	IOControlCode ioControlCode, 
	byte[] optionInValue, 
	byte[] optionOutValue
)
public function IOControl (
	ioControlCode : IOControlCode, 
	optionInValue : byte[], 
	optionOutValue : byte[]
) : int
Not applicable.

Parameters

ioControlCode

A IOControlCode value that specifies the control code of the operation to perform.

optionInValue

An array of type Byte that contains the input data required by the operation.

optionOutValue

An array of type Byte that contains the output data returned by the operation.

Return Value

The number of bytes in the optionOutValue parameter.

Exception typeCondition

SocketException

An error occurred when attempting to access the socket. See the Remarks section for more information.

ObjectDisposedException

The Socket has been closed.

InvalidOperationException

An attempt was made to change the blocking mode without using the Blocking property.

This method provides low-level access to the operating system Socket underlying the current instance of the Socket class. For more, see the WSAIoctl documentation in the MSDN library.

NoteNote:

If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error.

NoteNote:

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example compares the results of calling IOControl with DataToRead and the Available property.

static void DisplayPendingByteCount(Socket s)
{
    byte[] outValue = BitConverter.GetBytes(0);

    // Check how many bytes have been received.
    s.IOControl(IOControlCode.DataToRead, null, outValue);

    uint bytesAvailable = BitConverter.ToUInt32(outValue, 0);
    Console.Write("server has {0} bytes pending. ", 
        bytesAvailable);
    Console.WriteLine("Available property says {1}.",
                     s.Available);

    return;
}

static void DisplayPendingByteCount(Socket s)
{
    ubyte outValue[] = BitConverter.GetBytes(0);
    // Check how many bytes have been received.
    s.IOControl(IOControlCode.DataToRead, null, outValue);
    UInt32 bytesAvailable = BitConverter.ToUInt32(outValue, 0);
    //ToDo: Unsigned Integers not supported- converted to int
    Console.Write("server has {0} bytes pending. ",
        bytesAvailable.ToString());
    Console.WriteLine("Available property says {1}.", 
        (System.Int32)s.get_Available());
    return;
} //DisplayPendingByteCount

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0
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