Flash MX 2004 Games : Art to ActionScript

Flash MX 2004 Games
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var b = Number(Request("B"));
var op = Request("op");
var output = "answer=error";
Response.Expires = -1;
if (op == "add") {
output = "answer=" + (a + b);
}else if (op == "subtract"){
output = "answer=" + (a - b);
}
Response.Write(output);
The first line tells ASP that the scripting language is JavaScript. Then the actual script is contained
between the tags ‘’. Because the language is JavaScript it is very similar to ActionScript.
First we declare a few variables. ‘Number(Request(“A”))’ extracts the variable A in the query
string and turns it into a number rather than the default of a string. If the file is saved as ‘calc.asp’
in folder ‘scripts’ of server ‘myserver’ then we can call the page using
http://myserver/scripts/calc.asp?A=13&B=8&op=add
In this case the value for the variable a will be set to 13, b to 8 and op to ‘add’. Using
‘Response.Expires= −1’ tells the browser not to cache the page. Then we test for the appropriate
op; if either ‘add’ or ‘subtract’ is found then we build a string, ‘output’. Finally this is sent to
the browser using ‘Response.Write(output)’. If we called this from Flash then the variable ‘answer’
would be set to one of ‘a + b’, ‘a − b’, or ‘error’. The output can contain multiple values if each
variable, value pair is connected to the rest using the ampersand character (&).
Using the LoadVars object
A new feature in Flash MX was the LoadVars object. This useful object is designed to make
communicating with external data easier for the developer. The object uses callback functions. A
callback function is simply a function that is called when a particular event occurs. You tell the
object where to find the function and then this function will be called whenever a certain event
takes place.
Suppose we have the following code on frame 1 of our main timeline:
178
lv = new LoadVars();
lv.onLoad = loaded;
lv.load("myvariables.txt");
stop();