Shoutbox

The following is untested. Should work with a few tweaks i think.

Ascii range 40 - 57 contains the following characters:
()*+,-./0123456789

code:

---

function OnEvent_ChatWndRecieveMessage(ChatWnd, Message) {
    if (Message.substring(0,6).toLowerCase() != '!calc ') return Message;
    var Msg = Message.substring(6, Message.length);
    var Valid = true, j;
    for (j=0; j<Msg.length; j++) if ((Msg.charCodeAt(j) < 40) || (Msg.charCodeAt(j) > 57))
        Valid = false;
    ChatWnd.SendMessage(Valid ? eval(Msg) : 'The calculation contained invalid characters.');
    return Message;
}

---

Here's something I've been playing with... It removes all alpha characters and most symbols except for mathematical operators from the eval string to try and prevent exposing your PC through WLM.

Just use !calc to calculate an expression. (Either you or contacts can send calculations to the Chat Window)

@Pinecone: That looks like a very simple implementation, although I'd suggest you could optimize that code by breaking out of the loop as soon as you found an invalid character:

code:

---

    for (j=0; j<Msg.length; j++) if ((Msg.charCodeAt(j) < 40) || (Msg.charCodeAt(j) > 57)) {
        Valid = false;
        break;
}

---

@Spunky: Indeed, you can simply strip out all alphabetical characters and other possibly malicious characters. However, I'd suggest you to improve your stripping algorithm then: instead of looping through the whole array everytime !calc is received, you could create one single RegExp at start-up formed by a single loop which will strip all unwanted characters:

code:

---

var iChars = array("!", "£", "\\$", "\&", "\\?", "\>", "\<", ",", "\\.", "@", "\'", ":", ";", "\\[", "\\]", "=", "\\|", "`", "¬", "\\\\", "\"");
var reStrip = new RegExp("[a-z" + iChars.join("") + "]+", "gi");

/* ... */
Message = Message.substr(6);
Message = Message.replace(reStrip, "");
try{
/* ... */

---

And what if you'd want to extend such a script and make things like sin(60), cos(60), sqrt(64) work? Well, good luck to both of you if you're looking to extend your scripts.

THX GUYS! 

Hmm I have bad news (for me ) I tried to change the code, what you wrote before, but it doesnt working at me.

My contact writes to the window: !calc 2+2
And my client doesn't give any answer Maybe i did badly somthing?

Maybe we can help explain where you've gone wrong if you post your changed code.