[Private200]

Okay, you mean show dialog only 1 time at first spawn? If yes, then you have to use something like this:

PHP код:

// Top of script

new WeaponDialogs[MAX_PLAYERS];

public OnPlayerConnect(playerid)
{
     WeaponDialogs[playerid] = 1;
     return 1;
}

public OnPlayerSpawn(playerid)
{
     if(WeaponDialogs[playerid] == 1)
     {
    ShowPlayerDialog(playerid, DIALOG_WEAPONS, DIALOG_STYLE_LIST, "What type of weapon do you want?", "Melee Weapons \nPistols\nShotguns\nSub-Machine Guns\nRifles\nJetpack\nCamera\nMinigun", "Search", "Cancel"); 
     WeaponDialogs[playerid] = 0;
     }
     return 1;
} 


I think this is what you're asking for and it shall work fine.