How to pass constant of LineType::Item to a proc

markcle · 2020-02-28

Hi All

Writing an AL extension and need to call a proc that finds all sales lines of Type "Item", How do I pass the constant "Item".

I'm calling from a subscription on a Sales Header, so i can pass rec."Document Type" for the Doc Type, but can't figure out how to pass LineType of Item

Can someone point me in the right direction

Here's my proc definition:

   local procedure DeleteLines(var DocNo: code[20]; var DocType: Option; var ItemType: Option; FilterString: Text)

Here's my call:

    DeleteLines(rec."No.",  rec."Document Type", [b]'ITEM'[/b], 'FLOC | FCOM | FRES | FLIFT');

Thanks

Mark

ShaiHulud · 2020-03-02

You can create a variable inside your function of type Record "Sales Line", like

SalesLine: Record "Sales Line";

And then call your function like:

DeleteLines(rec."No.",  rec."Document Type", SalesLine.Type::Item, 'FLOC | FCOM | FRES | FLIFT');

Alternatively, since you can refer to options also as indexes the strings represent, you can lookup the existing options of "Sales Line".Type, find that it's:
" ,G/L Account,Item,Resource,Fixed Asset,Charge (Item)"
meaning that "Item" is index 2. With that, you can also call your function like:

DeleteLines(rec."No.",  rec."Document Type", 2, 'FLOC | FCOM | FRES | FLIFT');

DenSter · 2020-03-02

var is the AL way of saying a parameter is 'by reference'

navdeveloper · 2020-03-01

Hi,

You can pass ItemType::ITEM

Thanks,

ShaiHulud · 2020-03-02

You can create a variable inside your function of type Record "Sales Line", like

SalesLine: Record "Sales Line";

And then call your function like:

DeleteLines(rec."No.",  rec."Document Type", SalesLine.Type::Item, 'FLOC | FCOM | FRES | FLIFT');

Alternatively, since you can refer to options also as indexes the strings represent, you can lookup the existing options of "Sales Line".Type, find that it's:
" ,G/L Account,Item,Resource,Fixed Asset,Charge (Item)"
meaning that "Item" is index 2. With that, you can also call your function like:

DeleteLines(rec."No.",  rec."Document Type", 2, 'FLOC | FCOM | FRES | FLIFT');

markcle · 2020-03-02

Thanks all. I'd previously tried both suggestions (2 and temp record variable and got same error" can;t convert in to type Option")

It was the parameter declaration on my DeleteLines Proc.

I mistakenly had:

local procedure DeleteLines(var DocNo: code[20]; var DocType: Option; var ItemType: Option; FilterString: Text)

removing var in from front of the ItemType param fixed it.

I guess I'm not clear on how when to use var on a proc definition. I looked at the AL programming guide: https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-al-methods#CallMethod and it uses var in one parameter, but there's no explanation of it.

So when would I used "var: in the proc parameter and what does it do?

Also, how do I pass by Ref vs pas by Value?

TIA

Mark

DenSter · 2020-03-02

var is the AL way of saying a parameter is 'by reference'

markcle · 2020-03-03

Thanks a lot!

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