CODESYS Forge - CODESYS Forge / Talk / Runtime 🇬🇧: Using "localhost" address

alonohev - 2019-04-28

Hello.
I'm using , and would like to use 'localhost' as the "" input.
https://help.codesys.com/webapp/RL4Lo8oYYkL-EiF1HG7hca7bLAI%2FTCP_Server;product=CAA_NetBaseServices;version=3.5.14.0
How can this be done? What is the best way to read this operating-system's variable?
Should I use a different library?
Thank you.

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alonohev - 2019-04-28

P.S.
Would it be easier if I wrote the specific IP address in an *.XML file and read it from there?
If so, do codesys has an XML library?
Thanks

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Lo5tNet - 2019-04-29

Could you just use the loopback address 127.0.0.1?

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Best is to use loopback, but if you need to know your device IP, you could either use this :

// Gets specific interface IP address
FUNCTION GetOwnIp : STRING(15) // Returns IP address from selected adapter. Need SysSocket library
VAR_INPUT
   IndexOfAdapter : INT := 0; // Index of the ethernet adapter to get IP from (base 0) 
END_VAR
VAR
   sHostName   : STRING; // Own hostname
   Host : SysSocket.SOCK_HOSTENT; // Own host description
   pIPAddress  : POINTER TO DWORD; // Pointer to INADDR containing IP address
   in_addr     : INADDR; // Strong typed INADDR containing IP address
   sIPAddress  : STRING; // IP address in string format
END_VAR
(* Get own hostname. *)
SysSockGetHostName(szHostName:=sHostName, diNameLen:=SIZEOF(sHostName));
(* Get own IP address by its name. *)
SysSockGetHostByName(szHostName:=sHostName,pHost:= ADR(Host));
(* Get adress of first adapter *)
pIPAddress := Host.pAddrList[IndexOfAdapter];
(* Cast pointer data to INADDR type *)
in_addr.ulAddr := pIPAddress^;
(* Get string format *)
SysSockInetNtoa(pInAddr := ADR(in_addr),szIPADDR := sIPAddress, diIPAddrSize:=SIZEOF(sIPAddress));
(* Function return *)
GetOwnIp:=sIPAddress;

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Using "localhost" address