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SerialPort.Write Method (Char(), Int32, Int32)

Writes a specified number of characters to the serial port using data from a buffer.

Namespace:  System.IO.Ports
Assembly:  System (in System.dll)

'Declaration
Public Sub Write ( _
	buffer As Char(), _
	offset As Integer, _
	count As Integer _
)

Parameters

buffer
Type: System.Char()

The character array that contains the data to write to the port.

offset
Type: System.Int32

The zero-based byte offset in the buffer parameter at which to begin copying bytes to the port.

count
Type: System.Int32

The number of characters to write.

ExceptionCondition
ArgumentNullException

The buffer passed is Nothing.

InvalidOperationException

The specified port is not open.

ArgumentOutOfRangeException

The offset or count parameters are outside a valid region of the buffer being passed. Either offset or count is less than zero.

ArgumentException

offset plus count is greater than the length of the buffer.

TimeoutException

The operation did not complete before the time-out period ended.

Use this method when you want to write to a character buffer to create output to a serial port.

If there are too many bytes in the output buffer and Handshake is set to XOnXOff then the SerialPort object may raise a TimeoutException while it waits for the device to be ready to accept more data.

By default, SerialPort uses ASCIIEncoding to encode the characters. ASCIIEncoding encodes all characters greater than 127 as (char)63 or '?'. To support additional characters in that range, set Encoding to UTF8Encoding, UTF32Encoding, or UnicodeEncoding.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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