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call a function when certain cvar changes its value?


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supertrio17
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Join Date: May 2020
Location: Serbia
Old 06-01-2020 , 13:18   call a function when certain cvar changes its value?
Reply With Quote #1

So, I want to detect when certain cvar changes its value, and than execute some function.
Currently I'm using client_PreThink to detect when cvar changes, but I was wondering if there is any more reliable way to do this?
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shauli
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Old 06-01-2020 , 13:27   Re: call a function when certain cvar changes its value?
Reply With Quote #2

In newer amxx versions you can use hook_cvar_change, or alternatively bind_pcvar_* for certain purposes.

Last edited by shauli; 06-01-2020 at 13:29.
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OciXCrom
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Old 06-01-2020 , 13:36   Re: call a function when certain cvar changes its value?
Reply With Quote #3

client_PreThink is officialy THE WORST way you can do that. That function is called 100 times each second. The least you can do is use a 1 second task or longer.

For versions prior to 1.9, you need this module - https://forums.alliedmods.net/showthread.php?t=154642
The easier/better solution is of course updating to 1.9 IMO.
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supertrio17
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Old 06-01-2020 , 14:01   Re: call a function when certain cvar changes its value?
Reply With Quote #4

Quote:
Originally Posted by OciXCrom View Post
client_PreThink is officialy THE WORST way you can do that. That function is called 100 times each second. The least you can do is use a 1 second task or longer.

For versions prior to 1.9, you need this module - https://forums.alliedmods.net/showthread.php?t=154642
The easier/better solution is of course updating to 1.9 IMO.
I was hoping to do it without that module, is there any way to do it without it?
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Gabe Iggy
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Old 06-01-2020 , 14:08   Re: call a function when certain cvar changes its value?
Reply With Quote #5

Yes, updating to 1.9, unless you want to constantly querying the cvar for a possible change.
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Last edited by Gabe Iggy; 06-01-2020 at 14:09.
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HamletEagle
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Join Date: Sep 2013
Location: Romania
Old 06-01-2020 , 16:30   Re: call a function when certain cvar changes its value?
Reply With Quote #6

The proper way for amxx < 1.9 is orpheu/okapi.
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Last edited by HamletEagle; 06-01-2020 at 16:30.
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Bugsy
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Old 06-01-2020 , 17:16   Re: call a function when certain cvar changes its value?
Reply With Quote #7

How critical is it that the change in cvar is detected immediately? You can always hook a game event and then react there (round start or end, or on each kill).
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supertrio17
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Old 06-01-2020 , 17:51   Re: call a function when certain cvar changes its value?
Reply With Quote #8

It's not that critical, but I was wondering if it is possible?
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Bugsy
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Old 06-01-2020 , 18:34   Re: call a function when certain cvar changes its value?
Reply With Quote #9

Upgrade to 1.9 and it's super easy: http://amxmodx.org/api/cvars/hook_cvar_change

Otherwise I'd stick with hooking a game event, not prethink.
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CrazY.
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Join Date: May 2015
Location: SP, Brazil
Old 06-02-2020 , 11:02   Re: call a function when certain cvar changes its value?
Reply With Quote #10

Store the cvar value in a global variable, set_task, compare the current cvar value with the one you saved in the global variable, if the value is different, execute the function you want - easy.

Hook cvar change with orpheu - medium.

Or just upgrade to 1.9 and do what they told you above - very easy/recommended.
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Last edited by CrazY.; 06-02-2020 at 11:08.
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