get_last

adys · June 2007

Is its safe to call get last from a function that called from the EVENT and not inside the Event code itself?

I mean if I have button event, and in the button event I call to function doX that call to function doY. inside doY i need the Tp that cause the event, so I call get_last with my global TP_LIST.

That works ok, I just wonder if that is safe and if what will happend if some event will enter in multiy TP enviroment.

thanks

Ady.

GSLogic · June 2007

Pass the TP number to the function, this way you can have multiple panels using the function.

DEFINE_FUNCTION whatEver(integer nPNL)
{
  //nPNL is your get_last panel number
}

//#############################################
BUTTON_EVENT[dTP,btArray]
{
  PUSH:
  {
     whatEver(get_last(dTP));
  }
}

adys · June 2007

That what I am trying to avoid

I have lots of written code that need to be changed - or to pass the TP or just to call get_last.

The question is if it safe, if there is a kind of build in protection on it

GSLogic · June 2007

I'm not really sure what you are asking but, you should have all events/functions look to the TP that triggered the event. If you are working in a large system with many TPs this is a MUST! It is good practice to store feedback in a structure and only send feedback to TPs that need to be updated.

adys · June 2007

I am just asking if its safe to ask get_last after some time that the event happend?

Or maybe I can get the new event data (event that I am still on the flow of the first event)?

An example:

BUTTON_EVENT
.....

get_last.
..
...

call Function X
call Function Y
..

Function Y Body

{
get_last

}

There is a chance that in the time between the button event and the get_last call inside function Y a new event will trigger.

The question is, what get_last will return? the new event TP of the current event TP?

DHawthorne · June 2007

No, it's not safe. The value could have changed. In many cases, it's not likely, but it is possible. The best practice is to keep get_last inside the event handler, and pass the return value to your function.

adys · June 2007

DHawthorne wrote:

No, it's not safe. The value could have changed. In many cases, it's not likely, but it is possible. The best practice is to keep get_last inside the event handler, and pass the return value to your function.

Thanks, that what I wanted to know.

vining · June 2007

DHawthorne wrote:

The best practice is to keep get_last inside the event handler, and pass the return value to your function.

Isn't that in a sense what the code snippet that GSLogic provided below does. The get_last function w/in the whatever function occurs in the Button_Event and its returned value is passed to the function whatever.

Code:
DEFINE_FUNCTION whatEver(integer nPNL)
{
  //nPNL is your get_last panel number
}

//#############################################
BUTTON_EVENT[dTP,btArray]
{
  PUSH:
  {
     whatEver(get_last(dTP));
  }
}__________________

get_last

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