Chief Delphi - EnhancedIO Exception Error

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- Java (http://www.chiefdelphi.com/forums/forumdisplay.php?f=184)

- - EnhancedIO Exception Error (http://www.chiefdelphi.com/forums/showthread.php?t=81453)

EnhancedIO Exception Error

We are trying to read a potentiometer connected to our Cypress IO board using the enhancedIO class.

Here is our code so far:

Code:

package edu.wpi.first.wpilibj.templates;



import edu.wpi.first.wpilibj.IterativeRobot;

import edu.wpi.first.wpilibj.RobotDrive;

import edu.wpi.first.wpilibj.Joystick;

import edu.wpi.first.wpilibj.Encoder;

import edu.wpi.first.wpilibj.AnalogChannel;

import edu.wpi.first.wpilibj.DigitalInput;

import edu.wpi.first.wpilibj.DriverStationEnhancedIO;

import edu.wpi.first.wpilibj.DriverStation;

/**

 * The VM is configured to automatically run this class, and to call the

 * functions corresponding to each mode, as described in the IterativeRobot

 * documentation. If you change the name of this class or the package after

 * creating this project, you must also update the manifest file in the resource

 * directory.

 */

public class Team503Robot extends IterativeRobot {

    private RobotDrive drivetrain;

    private Joystick gamepad;

    private Encoder leftDriveEncoder;

    private Encoder rightDriveEncoder;

    private AnalogChannel potentiometer;

    private DigitalInput limitSwitch;

    DriverStationEnhancedIO dseio; 

    /**

     * This function is run when the robot is first started up and should be

     * used for any initialization code.

     */

    public void robotInit() {

    dseio = DriverStation.getInstance().getEnhancedIO();





    }



    /**

     * This function is called periodically during autonomous

     */

    public void autonomousPeriodic() {



    }



    /**

     * This function is called periodically during operator control

     */

    public void teleopPeriodic() {

        double slider = dseio.getAnalogIn(1);



    }



}

We get an "unreported exception edu.wpi.first.wpilibj.DriverStationEnhancedIO.Enha ncedIOException; must be caught or declared to be thrown" error from the "double slider = dseio.getAnalogIn(1); line. Any help would be appreciated.

Re: EnhancedIO Exception Error

Well, it's been a little while since I did Java, but I would guess that the getAnalogIn function can throw an exception, and it's not being handled. You either need a try block around it or you need to declare that it can throw the exception.

Solution 1 (in method):
try {
double slider = dseio.getAnalogIn(1);
//additional code to execute if that works
}
catch (IOException ioexec) {
//do stuff here if it goes wrong
}
(this last part may or may not be necessary; just know that it will always execute, even if an exception is thrown)
finally {
//more stuff that will always execute
}

Solution 2:
public void teleopPeriodic() throws EnhancedIOException {
double slider = dseio.getAnalogIn(1);
}

Solution 1 has much better control over what happens if an exception is thrown, so I suggest you use that one in your program. I hope it works for you.

Re: EnhancedIO Exception Error

We tried solution 1 and it worked. Thanks for the help.