Access Violation error

[jamesbouckley]

I'm having a problem understanding a particular error that is crashing a programing I'm trying to fix.

bool Enemy::CheckCollision(ICollidable* pOtherObject)
{
	// Get the information about the other object
	float OtherPositionXY[2];
	pOtherObject->GetPosition(OtherPositionXY);
	float OtherSize = pOtherObject->GetCollisionSize();

	// Get the distance between the two objects
	float Difference[2] =
	{
		m_Position[0] - OtherPositionXY[0],
		m_Position[1] - OtherPositionXY[1]
	};
	float Distance = sqrtf((Difference[0] * Difference[0]) + (Difference[1] * Difference[1]));
	return (Distance < 0.5f * (OtherSize + k_EnemySize));
}

The access violation occurs on line 5 of the code. I understand that access violations are generally when pointers are pointing to something that they shouldn't and I think that is the case here. However, I'm still pretty new to C++ and I don't know how to proceed to find the origin of the error or how to fix it.

I should note that this is for a placement test and so if possible I'm not looking for a "cheat" I'm just stuck as to how to look for the cause of such an error.

Any help anyone can give is most welcome, thank you in advance.

[Peter87]

Look where you call CheckCollision and try to see if you pass in a valid pointer.

[codekiddy]

float OtherPositionXY[2]; //this may be problem IS IT INITIALIZED?
pOtherObject->GetPosition(OtherPositionXY);

[jamesbouckley]

I've tried initialising OtherPositionXY and I get the same problem. I've also tried initialising pOtherObject by making it point to NULL and that just gives the same error but at 0x00000000 instead.