Chief Delphi - Pointers Issues

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- - Pointers Issues (http://www.chiefdelphi.com/forums/showthread.php?t=100691)

Hey everyone,

So, we are having issues with pointers. I just wanted to know if anyone else is getting the same errors. They are kernel task exceptions. When I get rid of the pointers and initialize the classes another way, it all works.

If anyone has a solution, please tell me. Otherwise, I just want to know if everyone else is having the same issue or it's just me....

Code:

#include "WPILib.h"

#include "Drive.h"



class RobotDemo : public SimpleRobot

{

        Drive *dr;



public:

        RobotDemo(void)

        {

                GetWatchdog().Kill();

                dr = new Drive();

                //AxisCamera &camera = AxisCamera::GetInstance();

                dr->myRobot->SetExpiration(0.1);

        }



        /**

         * Drive left & right motors for 2 seconds then stop

         */

        void Autonomous(void)

        {

                GetWatchdog().Kill();

                //dr->myRobot->SetSafetyEnabled(false);

                dr->myRobot->Drive(0.5, 0.0);         // drive forwards half speed

                Wait(2.0);                                 //    for 2 seconds

                dr->myRobot->Drive(0.0, 0.0);         // stop robot

        }







        void OperatorControl(void)

        {

                GetWatchdog().Kill();

                //dr->myRobot->SetSafetyEnabled(true);

                while (IsOperatorControl())

                {

                        printf("In Operator\n");

                        dr->myRobot->TankDrive(dr->leftstick, dr->rightstick);

                        Wait(0.01);

                }

        }



        void Disabled(void)

        {

                printf("Disabled\n");

        }

};



START_ROBOT_CLASS(RobotDemo);

It keeps giving me that the Drive *dr; has not been initialized correctly, where I believe I have. Anyone know any ways I can debug this?

Thanks,
-Eagle Engineering 1138

Re: Pointers Issues

If you suspect you have a problem with your code, you need to post it so other people can help you.

Re: Pointers Issues

Quote:

Originally Posted by mikets (Post 1109556)

If you suspect you have a problem with your code, you need to post it so other people can help you.

Just posted the code in the main post.

Re: Pointers Issues

Quote:

Originally Posted by cjlane1138 (Post 1109546)

Code:

dr = new Drive();

It keeps giving me that the Drive *dr; has not been initialized correctly, where I believe I have. Anyone know any ways I can debug this?

Is there indeed a Drive() constructor with no parameters?

Re: Pointers Issues

Quote:

Originally Posted by Alan Anderson (Post 1109771)

Is there indeed a Drive() constructor with no parameters?

No, I have a separate Drive class.

Drive.h

Code:



#ifndef DRIVE_H_

#define DRIVE_H_

#include "WPILib.h"



class Drive

{

public:

        Drive();

        

        RobotDrive *myRobot;

        

        Jaguar *leftmotor;

        Jaguar *rightmotor;

        

        Joystick *leftstick;

        Joystick *rightstick;

};



#endif

Drive.cpp

Code:



#include "WPILib.h"

#include "Drive.h"



Drive::Drive()

{

        printf("Initializing Drive.cpp\n");

        

        leftmotor = new Jaguar(1);

        rightmotor = new Jaguar(2);

        

        myRobot = new RobotDrive(leftmotor, rightmotor);

        

        leftstick = new Joystick(1);

        rightstick = new Joystick(2);

};

There is the header file and the cpp file.
MyRobot is in the main post.

Re: Pointers Issues

Quote:

Originally Posted by cjlane1138 (Post 1109546)

Another way? What way works? Do you know which line kills it?

Re: Pointers Issues

I seem to remember something about needing to initialize things in the same order they were defined. This is just a guess, but have you tried moving the

Code:

myRobot = new RobotDrive(leftmotor, rightmotor);

line to the very beginning of Drive::Drive()?