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getStringLength

Short summary​

this methods returns the length of a null-terminated string in bytes

Attention: All strings are handled as null-terminated byte streams.

:return: length of the string

  • Return type: UDINT

Parameters​

NameTypeCommentKind
stringAddressPOINTER TO BYTEStart address of the string for which the length is to be determinedinput

Code​

Declaration​

METHOD PROTECTED getStringLength :UDINT
VAR_INPUT
	(* Start address of the string for which the length is to be determined *)
	stringAddress	:POINTER TO BYTE;
END_VAR
VAR CONSTANT
	(* the end of string marker *)
	END_OF_STRING	:BYTE := 16#00;
END_VAR

Implementation​

getStringLength := 0;
RETURN(stringAddress = 0);

WHILE (stringAddress[getStringLength] <> END_OF_STRING) DO
	getStringLength := getStringLength + 1;
END_WHILE