How can I force a building to cancel training a unit?

Theres an action
Unit - Issue Train/Upgrade Order

With this I can make a barracks train a footman.

But I want to be able to STOP a Barracks training a footman?
How can I do this.

thank you

Can you
during the training process ?

or possibly

There is a simpler way.

Just replace it with another barracks

what if there are other units of different type in que

Can you issue a 'cancel' order to the building?

You could re-order it to make those units, just have a trig detect what units are being created by the barracks.

Yes , you can http://www.wc3jass.com/viewtopic.php?t=147

Ok so just custom script this?

constant function OrderIdCancel takes nothing returns integer
return 851796
endfunction

How would I specify which building?

thank you

hmm.. would that pick all buildings of a type and order them to cancel?

How bout simply, Order triggering unit to cancelbuildorder?
That way I can setup the triggers easily

Sorry to keep nagging
thank you

Ok I couldnt get it working I thought I do it like this?

put this bit in custom script (of map)


put this bit in an action under custom script


What did I do wrong?

I assumed the first part sets Cancel = 851796
2nd part order triggering unit to 851796 (which is cancel)

It seemed logical to me, but probably got it all wrong

u put Custom Script: call IssueImmediateOrderById(GetTriggerUnit(),851796)
in the place where u want the unit to cancel trainning

Nope, it doesn't go like that. The first function is only optional, all it does is it returns the cancel order id. You would use it like this:
It's only meant for convenience, since it's easier to remember a descriptive function name than the number. However, if you use the number directly, there's no need for the first function.

I've been trying to use the cancel order myself today and couldn't get it to work either. As it turned out, I had the order id wrong, it's not 851796, but 851976!