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Arrays and null objects...

Started by PREDATOR_UK Dec 13, 2011 at 9:17 PM 6 replies 2.7k views

Original Post

PREDATOR_UK

Dec 13, 2011 at 9:17 PM

Any Help Appreciated - Thanks in advance.

ERROR MESSAGE:

Object reference not set to an instance of an object.

TRIGGER:

The code running the update map sequence.

LANGUAGE:

Code:

switch (layer2[x, y])
 {
 case 1:
 int health;
 int level;
 foreach (Power_Station pst in pstations)
 {
 if (pst.Getx() == x && pst.Gety() == y)
 {
 health = pst.GetHealth();
 level = pst.GetLevel();
 spriteBatch.Draw(power, texturerect, Color.White);
 spriteBatch.DrawString(font1, health.ToString(), new Vector2(x, y + 20), Color.White);
 }
 }
 break;
 case 2:
 spriteBatch.Draw(market, texturerect, Color.White);
 break;
 default:
 break;
 }

ApochPiQ

Dec 13, 2011 at 9:50 PM

Which line of code, specifically, is halting with the error?

PREDATOR_UK

Dec 13, 2011 at 9:52 PM

Which line of code, specifically, is halting with the error?

[color=#000088]if[color=#000000] [color=#666600]([color=#000000]pst[color=#666600].[color=#660066]Getx[color=#666600]()[color=#000000] [color=#666600]==[color=#000000] x [color=#666600]&&[color=#000000] pst[color=#666600].[color=#660066]Gety[color=#666600]()[color=#000000] [color=#666600]==[color=#000000] y[color=#666600])

ApochPiQ

Dec 14, 2011 at 1:47 AM

What is the complete type of pstations?

JonBonazza

Dec 14, 2011 at 2:19 AM

Not enough code to say for sure, but I am going to go out on a whim and say you declared an array of objects, but never initialized each object.

PREDATOR_UK

Dec 14, 2011 at 5:22 PM

Sorry for the late reply...

I think it has something to do with how I am initializing the class array:

Class Code:

public class Power_Station
 {
 public int health = 100;
 public int level = 0;
 public int x = 0;
 public int y = 0;
 
 public void SetLevel(int lvl)
 {
 level = lvl;
 }
 
 public int GetHealth()
 {
 return health;
 }
 
 public int GetLevel()
 {
 return level;
 }
 
 public void setx(int newx)
 {
 x = newx;
 }
 
 public void sety(int newy)
 {
 y = newy;
 }
 
 public int Getx()
 {
 return x;
 }
 
 public int Gety()
 {
 return y;
 }
 }

Initialisation code:


 Power_Station[] pstations;
 
 pstations = new Power_Station[60];

PREDATOR_UK

Dec 14, 2011 at 5:56 PM

Thanks for your help guys but I fixed it by using the following code in the initialisation method:

for (int i = 0; i!=60; i++)
 {
 pstations = new Power_Station();
 }

JonBonazza

Dec 14, 2011 at 10:53 PM

Hehe, thought so. ;) Common mistake. Happens to everyone.

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