AOI for string.replace method - PLCS.net

BachPhi · February 7th, 2019, 08:23 PM

I am looking for an AOI that can do string.replace(sSearch,sReplace).

Thanks.

ASF · February 7th, 2019, 10:13 PM

I'd imagine it would be pretty easy to put together with a few COP, FIND, DELETE and CONCAT instructions. I've never actually built one though.

BachPhi · February 8th, 2019, 08:01 AM

Shocking! PLC programmers probably not aware of this useful function in .NET.

I ended up w/: FIND, GRT, DELETE, INSERT

ASF · February 10th, 2019, 03:40 PM

Ah, I didn't even think of insert, that'd make it even easier!

PLC's are generally not geared toward string handling at all. They can do it, but it's never been a focus, because why would you do string handling in a PLC when you could do it in the HMI/OIT/software? You'd need a HMI/OIT/etc to allow for string manipulation in the first place, so it makes sense to do it at that level.

I'm curious now - I can't think of any likely reason to need a string search-and-replace function within a PLC - what's your application?

Geoff White · February 10th, 2019, 10:39 PM

I use an AOI with this in it:
if WorkString.LEN>0 and SearchString.LEN>0 then
Find(WorkString,SearchString,1,FoundPos);
if FoundPos>0 then
Delete(WorkString,SearchString.LEN,FoundPos,WorkSt ring);
Insert(WorkString,ReplaceString,FoundPos,WorkStrin g);
end_if;
end_if;

BachPhi · February 11th, 2019, 03:15 PM

Quote:

Originally Posted by ASF

Ah, I didn't even think of insert, that'd make it even easier!

PLC's are generally not geared toward string handling at all. They can do it, but it's never been a focus, because why would you do string handling in a PLC when you could do it in the HMI/OIT/software? You'd need a HMI/OIT/etc to allow for string manipulation in the first place, so it makes sense to do it at that level.

I'm curious now - I can't think of any likely reason to need a string search-and-replace function within a PLC - what's your application?

Zebra Printing - further info here: https://www.advancedhmi.com/forum/in...8&topic=2209.0

ASF · February 11th, 2019, 03:28 PM

So why not do the find and replace using VBA in the AAHMI before it even gets to the PLC/printer?

BachPhi · February 11th, 2019, 03:35 PM

Quote:

Originally Posted by ASF

So why not do the find and replace using VBA in the AAHMI before it even gets to the PLC/printer?

If using PC & AAHMI, then yes. No PLC requirement
If using PLC only, then the new AOI will do the search & replace the variables in the ZPL string.

ASF · February 11th, 2019, 05:19 PM

Right, got it. In that case, I'd probably build the ZPL string up piece by piece using CONCAT instructions, instead of starting with a complete string with placeholders and replacing them. But there are plenty of ways to skin this zebra.

February 7th, 2019, 08:23 PM	#1
BachPhi Member Join Date: Dec 2007 Location: Los Alamos Posts: 316	AOI for string.replace method I am looking for an AOI that can do string.replace(sSearch,sReplace). Thanks.

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February 7th, 2019, 10:13 PM	#2
ASF Lifetime Supporting Member Join Date: Jun 2012 Location: Australia Posts: 2,928	I'd imagine it would be pretty easy to put together with a few COP, FIND, DELETE and CONCAT instructions. I've never actually built one though.

February 8th, 2019, 08:01 AM	#3
BachPhi Member Join Date: Dec 2007 Location: Los Alamos Posts: 316	Shocking! PLC programmers probably not aware of this useful function in .NET. I ended up w/: FIND, GRT, DELETE, INSERT

February 10th, 2019, 03:40 PM	#4
ASF Lifetime Supporting Member Join Date: Jun 2012 Location: Australia Posts: 2,928	Ah, I didn't even think of insert, that'd make it even easier! PLC's are generally not geared toward string handling at all. They can do it, but it's never been a focus, because why would you do string handling in a PLC when you could do it in the HMI/OIT/software? You'd need a HMI/OIT/etc to allow for string manipulation in the first place, so it makes sense to do it at that level. I'm curious now - I can't think of any likely reason to need a string search-and-replace function within a PLC - what's your application?

February 10th, 2019, 10:39 PM	#5
Geoff White Member Join Date: Oct 2005 Location: Brisbane Posts: 385	I use an AOI with this in it: if WorkString.LEN>0 and SearchString.LEN>0 then Find(WorkString,SearchString,1,FoundPos); if FoundPos>0 then Delete(WorkString,SearchString.LEN,FoundPos,WorkSt ring); Insert(WorkString,ReplaceString,FoundPos,WorkStrin g); end_if; end_if;

February 11th, 2019, 03:28 PM	#7
ASF Lifetime Supporting Member Join Date: Jun 2012 Location: Australia Posts: 2,928	So why not do the find and replace using VBA in the AAHMI before it even gets to the PLC/printer?

February 11th, 2019, 05:19 PM	#9
ASF Lifetime Supporting Member Join Date: Jun 2012 Location: Australia Posts: 2,928	Right, got it. In that case, I'd probably build the ZPL string up piece by piece using CONCAT instructions, instead of starting with a complete string with placeholders and replacing them. But there are plenty of ways to skin this zebra.

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