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.
. Connor noob! Hello 
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