FastScript Bug: The "IS" operator is not working correctly

[pmk65]

The "IS" operator only works if the value testing is a true match, otherwise it will throw an error. (Which makes it quite useless.)

This works and outputs the text "var is a TStringList" in message panel

Code: Select all

var SL = new TStringList;
if (SL is TStringList) Script.Message("var is a TStringList");
delete SL;

But when the var is NOT a TStringList, like in this example:

Code: Select all

var NUM = 33;
if (NUM is TStringList) Script.Message("var is a TStringList");

An error is displayed in message panel: "Access violation at address 004062C0 in module 'webuild.exe'. Read of address 00000021"

[Aivars]

I'll see if it can be fixed.

[Aivars]

We have checked this and the problem here is that NUM is literal. If it was an object then you would be fine, but in this case 33 is auto-converted to pointer, script tries to access object at that pointer (which, natuarally, does not exist) and everything goes kaboom. "IS" is mean for objects only and it can't be fixed without breaking other functionality.

[pmk65]

Bummer. I was hoping I could use it for some all-purpose variable detection/identifying.