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Avoid error message if canvas doesn't exist [message #385579]

Tue, 10 February 2009 03:04

l0b0
Messages: 13
Registered: November 2006

Junior Member

I'm trying to implement a debug mode in some forms, so that if it's enabled the canvas named "DEBUG" will be set as visible. I've added the code to a when-new-form-instance trigger which is inherited by all the forms, but the problem now is that if the form doesn't exist,

set_view_property('DEBUG', visible, property_true);

generates an FRM-41053 error message. I've tried catching it, but it doesn't work. I can't find any function to check if a canvas exists, and find_view results can't be compared to null or an uninitialized viewport variable. How can I check that a canvas exists, or avoid an error popup on set_view_property with a non-existing canvas?

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Re: Avoid error message if canvas doesn't exist [message #385584 is a reply to message #385579]

Tue, 10 February 2009 03:17

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Quote:

I've tried catching it

How? Did you try ON-ERROR / ON-MESSAGE trigger? If not, search the board as there've been examples of how to properly do it.

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Re: Avoid error message if canvas doesn't exist [message #385601 is a reply to message #385584]

Tue, 10 February 2009 04:00

l0b0
Messages: 13
Registered: November 2006

Junior Member

Littlefoot wrote on Tue, 10 February 2009 10:17

Quote:

I've tried catching it

How? Did you try ON-ERROR / ON-MESSAGE trigger? If not, search the board as there've been examples of how to properly do it.

Here's the code which results in an error message:

begin
	set_view_property('DEBUG', visible, property_true);
exception
	when others then
		null;
end;

I just realized that on-error is called independently of this - Here's a working version:

:system.message_level := 20;
set_view_property('DEBUG', visible, property_true);
:system.message_level := 0;

Thank you very much!

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Re: Avoid error message if canvas doesn't exist [message #385775 is a reply to message #385601]

Wed, 11 February 2009 00:25

djmartin
Messages: 10181
Registered: March 2005
Location: Surges Bay TAS Australia

Senior Member
Account Moderator

You don't need to quote the whole of the previous post. We can read it!

David

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