Jetter JC-120MC, User Manual

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492 Jetter AG
10 Programming
Sending data
Data can be sent via a previously established TCP/IP connection or via a
UDP/IP connection of a client.
Via UDP/IP connection of a server data cannot be sent, but only received.
Function ConnectionSendData(IPConnection:Int,
IPAddr:Int,
IPPort:Int,
Const Ref SendData,
DataLen:Int):Int;
Description of the function parameters:
Parameter Value Comment
IPConnection
Handle Return value of the function
ConnectionCreate()
IPAddr
Valid IP address Required only for UDP/IP
client
IPPort
Valid IP port number Required only for UDP/IP
client
SendData
Address of the data block
to be sent
1 ... 4,000 Data block length in bytes
The following return values are possible:
Return value
0 Data have been sent successfully.
-1 Error when sending, e.g. connection interrupted.
-3 Invalid handle, e.g. sending via a UDP/IP server.
If data are to be sent via a TCP/IP connection, you can invoke the function
and assign the return value of a variable for further evaluation as follows:
Result := ConnectionSendData(hConnection,
0 ,
0 ,
SendBuffer,
SendLen);
Introduction
Function declaration
Function parameters
Return value
Using this function with
a TCP/IP connection