Using an if statement in a dialog option

[Mr_Threepwood]

Hello, I am new to these forums aswell as to adventure game studio.  I have been working through the begginers tutorials and I have come across a problem that I cant seem to find the answer to.  It seems that I cant put an "if" statement in dialog script, which i want because i want to have a dialog option hidden until the character has a certain inventory item, in my case it the item is inventury item #3.  I put this in the dialog:

#
// dialog script file
@S  // dialog startup entry point
if (player.inv[3]==1){
  option-on 1
  }
return
@1  // option 1
VENDOR: "Hmm lemme see that, ok sure you can have a hotdog but you have to give me the poster"
stop
@2  // option 2
VENDOR: "Have a nice day."
stop

the only problem is that if statements do not work in dialog script, so i can not run the game with this is.  So how do you make it check for an inventory item and then show a dialog option if the item is present?

[Mr_Threepwood]

Sorry about the script, I couldnt figure out how to make it appear as script, i clicked on additional options and it said the shortcut was the # key, but that didnt work, and i cant find how or if you can edit the original post so i had to repost.

[LordHart]

To make it appear as script, use can use the [ code ] or the [ pre ] (minus the spaces) tags.

Anyway, onto the problem... try this (changes in red):

// dialog script file
@S  // dialog startup entry point
if (character[EGO].inv[3]==1) {
  option-on 1
}
return
@1  // option 1
VENDOR: "Hmm lemme see that, ok sure you can have a hotdog but you have to give me the poster"
stop
@2  // option 2
VENDOR: "Have a nice day."
stop

[strazer]

Os, "player" is an alias for "character[EGO]".

As you said, you can't use if-statements in dialog scripts directly, so you have to use run-script:

// dialog script file
@S  // dialog startup entry point
run-script 77
return
@1  // option 1
VENDOR: "Hmm lemme see that, ok sure you can have a hotdog but you have to give me the poster"
stop
@2  // option 2
VENDOR: "Have a nice day."
stop

Global script

function dialog_request(int parameter) {

  if (parameter == 77) { // run-script 77 used
    if (player.inv[3]) // if player has (1 or more of) inventory item 3
      SetDialogOption(2, 1, 1); // option-on 1 in dialog 2
  }
  else
  if (parameter == 44) { // run-script 44 used
    // do other stuff
  }
  // and so on

}

[Mr_Threepwood]

Blah forgot to logon so now this is second time typing this.

I did exactly what strazer said to do in the dialog script, and in the global script i did this:

Code: ags

function dialog_request(int paramater){
	if (parameter== 77) {

		if (character[EGO].inv[2]){
		SetDialogOption(1, 1, 1);Ã,  Ã, 
		}
	}
}

and the error i get when i try to run this is "nested functions not supported (you may have forgotten a closing brace)".Ã,  I am fairly sure that I did not forget a closing brace, i placed the global script right before the last closing brace in the code.Ã,  Any ideas how i can fix this so that i can have my dialog turn on if the character has a certain item?

/edit
heres a simple question: does putting if (character[EGO].inv[2]) vs if (character[EGO].inv[2]==1) make any difference? will the second one make it so that the character must only have 1 of the item for the script to work, and if the play has more then 1 it will not be executed?

[TerranRich]

You should keep the "==1" part just to be on the safe side.

As for the braces, I can't see anythng wrong.

[strazer]

function dialog_request(int paramater){

The braces are okay.

i placed the global script right before the last closing brace in the code

dialog_script is a function in the global script, not the global script itself. The global script contains functions.

You have to put this function after the last closing brace. You can not put a function into another function (nesting).

will the second one make it so that the character must only have 1 of the item for the script to work, and if the play has more then 1 it will not be executed?

Exactly.
I always use it like that so it still works if the player picked up an item twice or more (coins etc.).

[Mr_Threepwood]

problem is now solved, thanks a lot to all that helped me solve this.  In case anyone else is wondering how to do this here is what i put in my scripts:

Dialog script

Code: ags

// dialog script file
@S  // dialog startup entry point
run-script 77
return
@1  // option 1
VENDOR: "Hmm lemme see that, ok sure you can have a hotdog but you have to give me the poster"
stop
@2  // option 2
VENDOR: "Have a nice day."
stop

in global script

Code: ags

function dialog_request(int parameter){//for dialog scripts to add options and other things
	if (parameter == 77){//if requested script is 77
		if (character[EGO].inv[3]){//if main character has 1 or more of inv item number 3 (hot dog poster in this case)
					  SetDialogOption(1,1,1);
					  }

	  }
  
}