CODESYS Forge - CODESYS Forge / Talk / Runtime 🇬🇧: How to know the IP address

JAPIB - 2015-06-06

Hello
My raspberry get an IP address by a DHCP server. I want to show it on a visualisation page.
What function block and what library should J use to find the IP address by programme......
Thank you in advance for your reply

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Hi Jabib,

use SysSocket lib following codesnippet or check attached Project example

PROGRAM PLC_PRG
VAR
   sHostName   : STRING;
   Host : SysSocket.SOCK_HOSTENT;
   pIPAddress  : POINTER TO DWORD;
   in_addr     : INADDR;
   sIPAddress  : STRING := 'aaa.bbb.ccc.ddd';
   sTextEingabe: String;
END_VAR
(* Get own hostname. *)
SysSockGetHostName(szHostName:=sHostName, diNameLen:=SIZEOF(sHostName));
(* Get own IP address by its name. *)
SysSockGetHostByName(szHostName:=sHostName,pHost:= ADR(Host));
pIPAddress := Host.pAddrList[0];// select the adapter of addrList[]
in_addr.ulAddr := pIPAddress^;
SysSockInetNtoa(pInAddr := ADR(in_addr),szIPADDR := sIPAddress, diIPAddrSize:=SIZEOF(sIPAddress));

BR
Edwin

PiFaceIoDrv_LadderExample_andSysProcess.project [104.28 KiB]

agea28 - 2020-12-01

And is this the same way for wlan0 address ?
Host.pAddrList[0] returns the eth0 address but wlan0 is another adapter of addrList[], no ?

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JAPIB - 2015-06-10

Hi Edwin,
Thank you. Its work well.
How to discover the possibilitése all those libraries that are not documented in the online help ?
It lacks a Wikipedia section !

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mike197678 - 2016-11-10

great,
and the mac adress?

thx

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Hi,
yes even this is possible:
You need to ad 'CmpSysEthernet' to the LibraryManager
then then the following code snippet should help.

getnumberofadapters(ADR(diNumber));
FOR iAdapter := 0 TO diNumber DOPROGRAM PLC_PRG
VAR
   diNumber: DINT;
   iAdapter: DINT;
   stName: STRING(255);
   stDescription: STRING(255);
   aby_address:ARRAY[1..6]OF BYTE;
END_VAR
   getadapterinfo(
   iAdapterNum := iAdapter, 
   pbName := ADR(stName), 
   pbDescrition := ADR(stDescription), 
   iBuffersize := SIZEOF(stName), 
   iMacLength := 6, 
   sMacAdress := ADR(aby_address));
END_FOR

BR
Edwin

IMG: mac.jpg

mike197678 - 2016-11-11

Thank You,

work perfect.

Thank you very much

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switcher - 2017-02-14

Great!

Is there possible to get a Serial number from CPU?

Thank You!

Best regards,
Zdenko.

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nothinrandom - 2017-06-01

Great info! So is there a way to combine these two and get the IP address from eth0 always? Thanks

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