08.11.2010, 12:54
(
Last edited by Lenny the Cup; 10/11/2010 at 11:07 AM.
)
I wrote this tutorial for a friend of mine who's learning but can't find any tutorial about strtok, and since there seems to be a lack of such threads, I'll post mine here. I hope it helps someone, even though strtok is useless compared to sscanf.
Here is an example of a basic command using three parameters:
Here is an example of a basic command using three parameters:
pawn Code:
CMD:order(playerid, params[])
{
// First we create the three strings and idx
new
string1[30],
string2[30],
string3[30],
idx; // idx helps the function strtok to remember which word it last took from a string
// Let's say the player types "/order extra crispy fries"
// /order is used in the yCMD/zcmd/whatever system you're using and the rest of the string ("extra crispy fries") is stored in params, the string
// We use strtok to grab the first word:
format(string1, 30, strtok(params, idx));
// PLEASE NOTE that strtok doesn't CHANGE the string, params is still the same as before!
// We simply store the location of the space, like a bookmark in a book, for the function strtok
// Now string1 contains "extra".
// idx is changed from 0 (Which it is when we create it) to a representational symbol of the location of the space
// in the string for the strtok function so it knows where it should start now that we do it again.
// Right now, strtok will start at the position marked with an *, which is a space: "extra*crispy fries".
format(string2, 30, strtok(params, idx));
// It got the word "crispy" from the string, since it's all the letters from the * to the next space!
// And now, we get "fries" since idx represents this position: "extra crispy*fries":
format(string3, 30, strtok(params, idx));
// So now we have three strings:
// string1: "extra"
// string2: "crispy"
// string3: "fries"
// And also:
// params: "extra crispy fries"
// Since the function we use to compare strings - strcmp - returns the same value if a string is empty as if
// it was what we're looking for, we need to make sure that the variables contain something. Let's put the check
// inside the string comparison part! (We use the function "isnull")
// Now we can start checking if the player wrote extra, then crispy, then fries!
if(!strcmp(string1, "extra", false, 5) && !isnull(string1)) // Always put in the maximum size of the word if you know what it is (5)
{
if(!strcmp(string2, "crispy", false, 6) && !isnull(string2))
{
if(!strcmp(string3, "fries", false, 5) && !isnull(string3))
{
SendClientMessage(playerid, 0xFF0000AA, "You've ordered some extra crispy fries!");
return 1;
}
SendClientMessage(playerid, 0xFF0000AA, "You forgot fries!");
return 1;
}
SendClientMessage(playerid, 0xFF0000AA, "You forgot crispy fries!");
return 1;
}
SendClientMessage(playerid, 0xFF0000AA, "You forgot extra crispy fries!");
return 1;
}
