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Question by secondry2 · Jan 02, 2014 at 02:04 AM · arraygameruntimeate

Problem reading from array at runtime

Ok, so basically I am making a game engine, and am having it so it reads from a code file at runtime. This is a short snippet that is causing the problem: (varList is a string, varArray is an array, I am splitting spaces to read the code file, so str is the string after the first space, the cases is the word before the first space)

 case "var":
             varList = varList + str + "|";
             varArray = varList.ToString().Split("|"[0]);
             
         case "getkey":
             var varIndex : int = 999;
             var error : boolean = false;
             var isDone : boolean = false;
             for (var iCount : int = 0; iCount < varArray.Length; iCount++) {
                 
                 if (varArray[iCount] == str && isSub && error == false && isDone == false) {
                     
                     varIndex = iCount;
                     error = false;
                     isDone = true;
                     
                 }
                 
             }
             
             if (error || isDone == false || varIndex == 999) {
                 
                 print("Variable, '" + str + "' not found!");
                 
             } else {
                 
                 var key;
                 
                 while (key == "") {
                     
                     key = Input.anyKeyDown;
                     
                 }
                 
                 print("Key pressed : " + key.ToString());
             }
             break;

sorry, formatting a bit messed up, but basically its throwing this error repetitively: NullReferenceExceptioon: Object reference not set to instance of an object Boo.Lang.Runtime>RuntimeServices.InvokeBinaryOperator (System.String operatorName, System.Object lhs System.Object rhs)

Referring to the line of code: varList = varList + str + "|";

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avatar image landon912 · Jan 02, 2014 at 02:51 AM 0
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Print out both "str" and "varList" to find which one is null.

avatar image secondry2 · Jan 02, 2014 at 02:55 AM 0
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Thanks for the reply, this is my new 'var case' and it doesnt get up to the printing out of str and varList

     case "var":
         varList = varList + str + "|";
         varArray = varList.ToString().Split("|"[0]);
         
         print(str);
         print(varList);
avatar image landon912 · Jan 02, 2014 at 02:59 AM 0
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Put it before the line with the error.

We need to see the whole script to help more man....

avatar image secondry2 · Jan 02, 2014 at 03:06 AM 0
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str=key varList=Null

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Answer by robhuhn · Jan 02, 2014 at 08:53 AM

You should declare varList with an initial value (empty string). Instead of something like private string varList; write

 private string varList = "";
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