Shift an Array of Strings

[CoderByNature]

Hey all, was wondering if it was possible to shift values in an array of strings?

I have a database that I am loading up with "Users" in the form of strings, String[64], my dilemma comes when I am attempting to delete the user from the database.

What I would love to do is take the found position of the data I want to delete and then copy the entire array from below that value up 1. So if I found the User data I want to delete at Userdata[8], then shift values Userdata[9]-[63] to Userdata[8]-[62] and write 0 in value Userdata[63].

So far I have tried COP(UserData[FSC_User.POS+1]) to UserData[FSC_User.POS] with length of (63 - FSC_User.POS) and an FAL command with the same logic. Neither have worked

Just wondering if this is possible or if there is a better way to do it

Thanks in advance for any guidance here

 

[cwal61]

You can't use an indirect address for an indirect address.

Move your FSC_User.POS tag into a DINT tag. Use that DINT tag for your indirect address.

MOV FSC_USER.POS FSC_POSITION. ADD FSC_POSITION 1 FSC_POSITION1

Same with the Length. Create a LENGTH tag. Do the math separately and put value in LENGTH Tag.

SUB 63 FSC_USER.POS LENGTH

Then do the copy.
COP(UserData[FSC_POSITION1]) to UserData[FSC_POSITION] LENGTH

 

[Aardwizz]

Neither have worked

What do you mean by that?
That it wouldn't compile, or that that the data didn't shift as you expected?

If the former, or if you reset FSC control word before executing the COP, you may need to put some local junk DINTs to calculate the positions and length prior to the COP.

This will also make debugging easier, as you can control the values in those registers to observe the change you expect.