AlliedModders - [TUT] Using Button Constants

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[TUT] Using Button Constants

This is a duplicate of the tutorial I made in the AMWiki in this URL: http://wiki.tcwonline.org/index.php/Button_constants

Usage

Button constants are generally used to determine when an entity is doing a certain action, such as jumping, attacking, or moving. This is used because +/- commands cannot be hooked by the HL engine (if they are made by the HL engine).
For example, this would work:

Code:

register_concmd("+explode","hook_explode")

However this would not:

Code:

register_concmd("+attack","hook_attack")

Why? Because the client does not literally send "+attack" over the reliable stream, since this would cause massive lag. Instead, an integer is sent, which is easier on bandwidth.

Constants

A full list of constants can be found here: http://amxmodx.org/funcwiki.php?go=m...#const_buttons

Implementation

If, for example, it is desired to check when a player is attacking, one would use the following:

Code:

#include <amxmodx>
#include <engine>

public plugin_init()
{
    register_plugin("Attack Test","1.0","Hawk552");
}

public client_PreThink(id)
{
    if(entity_get_int(id,EV_INT_BUTTON) & IN_ATTACK)
    {
        // do something
    }
}

Notice how this uses the & operator, rather than the && operator. This is because a bit value is returned, and the & operator checks if a bit value is contained in another bit value.
To set an entity's button, the same type of idea can be implemented:

Code:

#include <amxmodx>
#include <engine>

public plugin_init()
{
    register_plugin("Attack Test","1.0","Hawk552");
}

public client_PreThink(id)
{
    entity_set_int(id,EV_INT_button,IN_ATTACK);
}

This sets the client's attack flag to on every time a frame is rendered.
To get an entity's buttons, and then ommit a certain button, one would use the following:

Code:

#include <amxmodx>
#include <engine>

public plugin_init()
{
    register_plugin("Attack Test","1.0","Hawk552");
}

public client_PreThink(id)
{
    entity_set_int(id,EV_INT_button,entity_get_int(id,EV_INT_button) & ~IN_ATTACK);
}

Say, for example, during a certain time, the client is jumping and attacking at the same time. In this case, the entity_get_int(id,EV_INT_button) function would return IN_ATTACK and IN_JUMP. Using the ~ operator removes the certain bit value, making it into merely IN_JUMP.
There are many more ways to use button constants, and not all must be used on players. They are simply more commonly implemented when dealing with players.

Re: Using Button Constants

Cool man..

Did u ust make these up or are they from other places?

Re: Using Button Constants

Quote:

Originally Posted by SweatyBanana

Cool man..

Did u ust make these up or are they from other places?

If you read the first sentence in the post you would know.

Re: Using Button Constants

Is their any alternative to catching a client command thats a HL registered one... but not buttons like +attack and such. I want to do something for ESF, but since I can only do a +Powerup one time... I can't seem to think of a work around since I am new to AMXX scripting(the natives mainly).

Re: Using Button Constants

Quote:

Originally Posted by 3xr

This is being answered in AIM. (user talked to me there like a minute after he posted this)

Re: [TUT] Using Button Constants

Do i have to check if he is alive to? Or doesn't this work with dead players?

Re: [TUT] Using Button Constants

Quote:

Originally Posted by drekes (Post 1219455)

This works fine with dead players !

Re: [TUT] Using Button Constants

So does that mean if a dead player uses +attack it will be executing the code to? I'm confused.

Re: [TUT] Using Button Constants

Okay, thanks guys

EDIT: EV_INT_BUTTON gives undefined symbol here.

EDIT2: nevermind, it was EV_INT_button.