ShowPlayerDialog

// Define the dialog IDs either with an enum:
enum
{
    DIALOG_NULL,
    DIALOG_LOGIN,
    DIALOG_WELCOME,
    DIALOG_WEAPONS
}

// Alternatively, using macros:
#define DIALOG_NULL 0
#define DIALOG_LOGIN 1
#define DIALOG_WELCOME 2
#define DIALOG_WEAPONS 3

// Enums are recommended, as you don't have to keep track of used IDs. However, enums use memory to store the defines, whereas defines are processed in the 'pre-processor' (compiling) stage.

// Example for DIALOG_STYLE_MSGBOX:
ShowPlayerDialog(playerid, DIALOG_WELCOME, DIALOG_STYLE_MSGBOX, "Notice", "You are connected to the server", "Close", "");

// Example for DIALOG_STYLE_INPUT:
ShowPlayerDialog(playerid, DIALOG_LOGIN, DIALOG_STYLE_INPUT, "Login", "Enter your password below:", "Login", "Cancel");

// Example for DIALOG_STYLE_LIST:
ShowPlayerDialog(playerid, DIALOG_WEAPONS, DIALOG_STYLE_LIST, "Weapons", "AK47\nM4\nSniper Rifle", "Option 1", "Option 2");

// Example for DIALOG_STYLE_PASSWORD:
ShowPlayerDialog(playerid, DIALOG_LOGIN, DIALOG_STYLE_PASSWORD, "Login", "Enter your password below:", "Login", "Cancel");

// Example for DIALOG_STYLE_TABLIST:
ShowPlayerDialog(playerid, DIALOG_WEAPONS, DIALOG_STYLE_TABLIST, "Buy Weapon", "Deagle\t$5000\t100\nSawnoff\t$5000\t100\nPistol\t$1000\t50", "Select", "Cancel");

// Example for DIALOG_STYLE_TABLIST_HEADERS:
ShowPlayerDialog(playerid, DIALOG_WEAPONS, DIALOG_STYLE_TABLIST_HEADERS, "Buy Weapon", "Weapon\tPrice\tAmmo\nDeagle\t$5000\t100\nSawnoff\t$5000\t100\nPistol\t$1000\t50", "Select", "Cancel");