Chief Delphi - Problems forming NetworkTable between Robot and SmartDashboard

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Itamar

15-01-2013 11:51

Problems forming NetworkTable between Robot and SmartDashboard

Hello!

We are currently trying to form a connection between the robot and the Smart Dashboard. Here is part of the extension code we have written in Java:

Code:

if (table== null)

{  

            NetworkTable.setTeam(1943);

            NetworkTable.setServerMode();

            try {

                NetworkTable.initialize();

            } catch (IOException ex) {

                Logger.getLogger(TutorialLabel.class.getName()).log(Level.SEVERE, null, ex);

            }

            

            table = NetworkTable.getTable("RoboRealm");

}

And here is the robot code we have written in C++:

Code:

NetworkTable::SetTeam(1943);

NetworkTable::SetIPAddress("10.19.43.5");

NetworkTable::Initialize();

                

roborealmNetTable = NetworkTable::GetTable("RoboRealm");

The Java code runs okay, but the C++ doesn't. When debugging it, we noticed that the code freezes after we call the "NetworkTable::Initialize()" function. What can cause this problem? Can you spot anything wrong with our code?

Thanks!

cjlane1138

15-01-2013 11:55

Re: Problems forming NetworkTable between Robot and SmartDashboard

How are you initializing NetworkTable in C++? Is it a static declaration? Could you post the entire class?

Itamar

15-01-2013 11:57

Re: Problems forming NetworkTable between Robot and SmartDashboard

Quote:

Originally Posted by cjlane1138 (Post 1215760)

How are you initializing NetworkTable in C++? Is it a static declaration? Could you post the entire class?

Here is the complete robot code:

Code:

#include "WPILib.h"





class RobotDemo : public SimpleRobot

{

        Joystick stick; 

        Jaguar jaguar;

        

        NetworkTable* roborealmNetTable;

public:

        RobotDemo(void):

                stick(1),

                jaguar(2),

                roborealmNetTable(NULL)

        {

                NetworkTable::SetTeam(1943);

                NetworkTable::SetIPAddress("10.19.43.5");

                NetworkTable::Initialize();

                

                roborealmNetTable = NetworkTable::GetTable("RoboRealm");

        }



        void Autonomous(void)

        {



        }



        void OperatorControl(void)

        {

                while (IsOperatorControl())

                {

                        

                        if (stick.GetRawButton(1))

                        {

                                jaguar.Set(stick.GetY());

                        }

                        else

                        {

                                double d = roborealmNetTable->GetNumber("InputValue");

                                jaguar.Set(d);

                        }

                        

                        if (stick.GetRawButton(2))

                        {

                                roborealmNetTable->PutNumber("InputValue", 0);

                        }

                        

                        Wait(0.005);                                // wait for a motor update time

                }

        }        

        /**

         * Runs during test mode

         */

        void Test() {



        }

};

cjlane1138

15-01-2013 12:08

Re: Problems forming NetworkTable between Robot and SmartDashboard

The issue is probably how you are initializing the NetworkTable. You are setting it to null, where it probably should be initialized. I have not yet worked with NetworkTable's, but you can try looking at the WPILib Cookbook. Also, since you have declared a variable, you can use it as a pointer, so instead of this:

Code:

RobotDemo(void):

                stick(1),

                jaguar(2),

                roborealmNetTable(NULL)

        {

                NetworkTable::SetTeam(1943);

                NetworkTable::SetIPAddress("10.19.43.5");

                NetworkTable::Initialize();

                

                roborealmNetTable = NetworkTable::GetTable("RoboRealm");

        }

You could try this:

Code:

RobotDemo(void):

                stick(1),

                jaguar(2)

        {

                roborealmNetTable = new NetworkTable("RoboRealm");

                roborealmNetTable->SetTeam(1943);

                roborealmNetTable->SetIPAddress("10.19.43.5");

                roborealm->Initialize();

                

        }

I'm sorry if this is incorrect. This just seems to be the most likely solution to the problem. I will work on NetworkTables later this week. Try this and let me know how it works out!

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