[Mean]

Use the code you firstly posted^^, and put

pawn Код:

return true;

or

pawn Код:

return 1;

At end of your commands. Like:

pawn Код:

CMD:something( playerid, params[ ] )
{
    SendClientMessage( playerid, 0xAAAAAA, "BlaBla" );
    return 1; // This 
}

Or shorter:

pawn Код:

CMD:something( playerid, params[ ] ) 
{
    return SendClientMessage( playerid, 0xAAAAAA, "BlaBla" );
}

But you need to return something else than 0. OnPlayerCommandText will return 0 if you don't put any return upthere.

And for IsPlayerInRangeOfPoint:

pawn Код:

if( IsPlayerInRangeOfPoint( playerid, 5.0, 0.0, 0.0, 0.0 ) ) 
{
    SendClientMessage( playerid, 0xAAAAAA, "You are in range of 5 meters in the position: X: 0.0, Y: 0.0 and Z: 0.0" );
}
else
{
    SendClientMessage( playerid, 0xAAAAAA, "You are not in range of 5 meter for the X: 0.0, Y: 0.0 and Z: 0.0" );
}