[Pawn] how to get the last digit of a player's IP

[Kwarde]

You'll find sscanf being usefull in quite alot more situations. For starters, in commands.
Assume you've the command "/warn". You'll want to specify a playerid (or username) and a reason:

Code:

CMD:warn(playerid, params[])
{
? ? new warned_id, reason[75];
? ? if (sscanf(params, "rs[75]", warned_id, reason))
? ? {
? ? ? ? return SendClientMessage(playerid, -1, "USAGE: /warn [playerid/name] [reason]");
? ? }
? ? //Rest of code (warn the user, etc)

Command /kick, with a kick reason being optional:

Code:

CMD:kick(playerid, params[])
{
? ? new kicked_id, reason[75];
? ? if (sscanf(params, "rS(No reason)[75]", kicked_id, reason))
? ? {
? ? ? return SendClientMessage(playerid, -1, "USAGE: /kick [playerid/name] (reason. Default is 'No reason')");
? ? }
? ? //Rest of code...

Or fetching someone's geolocation using ip-api (csv): (eg. ip-api.com/csv/IP_HERE?fields=country,countryCode)

Code:

public on_fetch_geodata(playerid, response_code, data[])
{
? ? new
? ? ? ? country[64],
? ? ? ? countryCode[3]
? ? ;
? ? sscanf(data, "p<,>s[64]s[3]", country, countryCode);
? ? printf("Player %s(%i) is from %s(%s)", PlayerName(playerid), playerid, country, countryCode);
}

Or if you want to make a database migration system (run migrations when booting your mode to ensure database is up-to-date, without having to manually do that).

Code:

hook OnGameModeInit() //An OnGameModeInit() (or even OnScriptInit()) before any functions are loaded (but MySQL initialised)
{
? ? //Running functions to scan all files in "scriptfiles/db-migrations" (possible, using JaTochNietDan's FileManager. Code not here because purpose is sscanf example
? ? new
? ? ? ? migr_name[25], //Migration's name
? ? ? ? migr_v_maj, //Version (major)
? ? ? ? migr_v_min, //Version (minor)
? ? ? ? migr_v_bld //Version (build)
? ? ;
? ? //Let's assume a migration's name can be "NAME_vMaj-vMin-vBld" OR "NAME-vMaj" OR "NAME"
? ? if (!sscanf(file_name, "P<_-->s[25]ddd", migr_name, migr_v_maj, migr_v_min, migr_v_bld))
? ? {
? ? ? ? printf("Running migration '%s' from version %i.%i.%i", migr_name, migr_v_maj, migr_v_min, migr_v_bld);
? ? ? ? //mysql_query_file(___)
? ? }
? ? else if (!sscanf(file_name, "p<->s[25]i", migr_name, migr_v_maj))
? ? {
? ? ? ? printf("Running migration '%s' from version %i", migr_name, migr_v_maj);
? ? ? ? //etc...
? ? }
? ? else if (!sscanf(file_name, "p<->s[25]", migr_name))
? ? {
? ? ? ? printf("Running migration '%s, no version specified'", migr_name);
? ? ? ? //etc
? ? }
? ? else
? ? {
? ? ? ? printf("<!> Not running migration '%s', invalid file name", file_name);
? ? }
? ? return 1;
}

Or maybe some motd data was weirdy saved in an ini file (eg. "motd=Msg1:Hello world!;Msg2:This is a message in the motd!;Msg3:Check our website!")

Code:

new LineFromIniFile[] = "motd=Msg1:Hello world!;Msg2:This is a message in the motd!;Msg3:Check our website!"; //Represent that line I mentioned above
new Msg1[35], Msg2[35], Msg3[35];
sscanf(LineFromIniFile, "P<=:;:;:>{s[5]s[5]}s[35]{s[5]}s[35]{s[5]}s[35]", Msg1, Msg2, Msg3);
printf("%s----%s----%s", Msg1, Msg2, Msg3); //Output: Hello world!----This is a message in the motd!----Check our website!

And I could go on for a while with crazier examples... but that's a bit too much (in fact, this entire post is because your answer has already been answered. Going waay off topic here).
Have a nice day :-)


To be more on topic, by the way:

&& (1 <= ip_part4 <= 255 || ip_part4 == 1)

If the IP is "127.0.0.1", ip_part4 will be "1".
1- "1 <= ip_part4 <= 255" will be true when ip_part4 is ATLEAST 1 and NO MORE THAN 255
2- "ip_part4 == 1" will be true when ip_part4 is EXACTLY 1.

Statement is double (and thus quite unnecessary) since both checks will return true for "1". Small thing, but wanted to point it out anyway.