Errors Not Thrown From Internal Event Functions (Onlbuttonup)

[SteveMyres]

I have some script in OnLButtonUp(), which didn't do what I expected, but which didn't throw any error messages   The issue turned out to be that due to some other edits, there was no longer a declaration nor assignment for one of the variables used.

 

So in a typical sequence this would have given a "Channel or function not found" error, but none was shown.   Do the internal functions not throw error messages?

 

If not, then if I need to see the error messages, can I just move the code to another function and call that one from the internal function?  Or would that behavior apply to everything in that call hierarchy?

[AzeoTech]

Its easier to simply throw a try/catch block around the whole thing:

 

try

   // your code here

catch()

   ? strLastError

endcatch

 

Part of the reason for no error messages by default on these functions is that these events get run often, especially MouseMove, and if you have errors and a message is displayed you'd get thousands of messages in a few instants which would bog down the system.

[SteveMyres]

I thought that might be the reason, and yeah, I'd even be real careful what code was put in OnMouseMove(), if any.

 

Hadn't thought of using a try/catch block (though if I had I might have assumed that wouldn't work any place alerts wouldn't work in general).

 

Good idea, thanks!