DataToSend Property

A string of data to be sent to the remote host. Write-only property.

Syntax

__property String DataToSend = {read=FDataToSend, write=FSetDataToSend};

__property RawByteString DataToSendB = {read=FDataToSendB, write=FSetDataToSendB};

Default Value

""

Remarks

Assigning a string to the DataToSend property makes the component send the string to the remote host. The Send method provides similar functionality.

Attempts to send the string assigned to DataToSend as a complete message. If system buffers are full, or the message cannot be delivered for any other reason, an error is fired, and no portion of the message is sent. This is different from TCP where portions of the messages can be sent. UDP sends either a complete message or nothing at all.

If you are sending data to the remote host faster than it can process it, or faster than the network's bandwidth allows, the outgoing queue might fill up. When this happens, DataToSend raises the exception with errorcode 10035 and message "[10035] Operation would block" (WSAEWOULDBLOCK). You can handle this exception, and then try to send the data again.

Example (Send Data)

UDPPortControl.LocalPort = 8765 
UDPPortControl.RemotePort = 8765 
UDPPortControl.RemoteHost = "HostNameOrIPAddress"
UDPPortControl.Active = True
UDPPortControl.DataToSend = "Hello!"

This property is write-only and not available at design time.

Data Type

Binary String