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PREDATOR_UK

Arrays and null objects...

7 posts in this topic

[center][size="2"]Any Help Appreciated - Thanks in advance.[/size][/center][center] [/center][center][size="2"]ERROR MESSAGE:[/size][/center][center][size="2"]Object reference not set to an instance of an object.[/size][/center][center] [/center][center][size="2"]TRIGGER:[/size][/center][center][size="2"]The code running the update map sequence.[/size][/center]
[center][size="2"]LANGUAGE:[/size][/center][size="2"][center]C#[/center][/size]

[size="2"][b][u]Code:[/u][/b][/size]

[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;
}[/code]
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[quote name='ApochPiQ' timestamp='1323813048' post='4893641']
Which line of code, specifically, is halting with the error?
[/quote]

[color=#000088]if[/color][color=#000000] [/color][color=#666600]([/color][color=#000000]pst[/color][color=#666600].[/color][color=#660066]Getx[/color][color=#666600]()[/color][color=#000000] [/color][color=#666600]==[/color][color=#000000] x [/color][color=#666600]&&[/color][color=#000000] pst[/color][color=#666600].[/color][color=#660066]Gety[/color][color=#666600]()[/color][color=#000000] [/color][color=#666600]==[/color][color=#000000] y[/color][color=#666600])[/color]
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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.
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Sorry for the late reply...

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

Class Code:

[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;
}
}[/code]


Initialisation code:

[code]
Power_Station[] pstations;

pstations = new Power_Station[60];
[/code]
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Thanks for your help guys but I fixed it by using the following code in the initialisation method:

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