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I'm working on a server and I've come up with an idea to keep from overwriting files (using GS2, I"VE FINALLY MIGRATED TO GS2!!)
This example uses the file test.txt in the levels folder.
Can't I use

NPC Code:

---

function onCreated&&Fileexists(levels/test.txt)

{

   selectfilefordownload(levels/test.txt);

} 

---

Not sure, but the idea checks the player's graal folder for the file before downloading it to the client. Also, should I put this Clientside?

NPC Code:

---

function onCreated() {

  temp.check = this.FindFile("levels/test.txt");

  if (temp.check == false) {

    selectfilefordownload("levels/test.txt");

  }

}

function FindFile(filedir) {

  if (Fileexists(filedir))

    return true;

  return false;

}

---

I think it'd work, not too sure. Never used selectfilefordownload etc. Anyhow, this is how I would probably do it...
And no, I don't think there is a way of doing it like you said

Hm, what is the point in doing that? You're essentially just doing:

function FindFile(filedir) return fileexists(filedir);

Good point, I never thought of it like that.

If it's written like that, though, you can tell that it is pointless :P

Reason is, to prevent downloading times, which means less download-lag.

The problem is that the "new event blocks" are not simply conditional clauses, with if-condition-action stuff, but actually functions that are automatically called when an event happens. onCreated is the name of the function that the engine will call, and not the name of the flag that will be set to true while the engine is calling the script. You are declaring a function and not doing flow-control.

You will need to (and should have in GS1, see KSI-GS) nest the conditional check within the event block. A simple example is, without redundant functions, a direct translation of your code:

NPC Code:

---

function onCreated() {

  if (fileExists("levels/test.txt"))

   selectFileForDownload("levels/test.txt");

}

---

Yes. The server cannot snoop around the client's files easily.

Edit: Oh, yeah. You should surround strings with quotation marks.