Camera

Technical Java
1

When I try and run this code, I get the following exception. I am programming in Java, so why does my exception include something relating to WindRiver? I’m trying to store an image on the cRIO and then I plan to retrieve the images using FTP.

AxisCamera cam = AxisCamera.getInstance(“192.168.0.90”);
cam.getImage().write(“image.jpg”);

>>>>ERROR: The object is in an incompatible mode: No content-length token found in packet …in ReadImagesFromCamera() in C:/WindRiver/workspace/WPILib/Vision/AxisCamera.cpp at line 281
[cRIO] Default disabled() method running, consider providing your own
[cRIO] Default disabled() method running, consider providing your own
[cRIO] edu.wpi.first.wpilibj.camera.AxisCameraException: No image available
[cRIO] at edu.wpi.first.wpilibj.camera.AxisCamera.getImage(AxisCamera.java:292)
[cRIO] at edu.wpi.first.wpilibj.templates.RobotTemplate.operatorControl(RobotTemplate.java:82)
[cRIO] at edu.wpi.first.wpilibj.SimpleRobot.startCompetition(SimpleRobot.java:118)
[cRIO] at edu.wpi.first.wpilibj.RobotBase.startApp(RobotBase.java:156)
[cRIO] in virtual method #10 of javax.microedition.midlet.MIDlet(bci=17)
[cRIO] at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(64)
[cRIO] at com.sun.squawk.imp.MIDletMainWrapper.main(110)
[cRIO] in virtual method #95 of com.sun.squawk.Klass(bci=25)
[cRIO] at com.sun.squawk.Isolate.run(1506)
[cRIO] at java.lang.Thread.run(231)
[cRIO] in virtual method #47 of com.sun.squawk.VMThread(bci=42)
[cRIO] in static method #3 of com.sun.squawk.VM(bci=6)
[cRIO] edu.wpi.first.wpilibj.camera.AxisCameraException: No image available
[cRIO] at edu.wpi.first.wpilibj.camera.AxisCamera.getImage(AxisCamera.java:292)
[cRIO] at edu.wpi.first.wpilibj.templates.RobotTemplate.operatorControl(RobotTemplate.java:82)
[cRIO] at edu.wpi.first.wpilibj.SimpleRobot.startCompetition(SimpleRobot.java:118)
[cRIO] at edu.wpi.first.wpilibj.RobotBase.startApp(RobotBase.java:156)
[cRIO] in virtual method #10 of javax.microedition.midlet.MIDlet(bci=17)
[cRIO] at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(64)
[cRIO] at com.sun.squawk.imp.MIDletMainWrapper.main(110)
[cRIO] in virtual method #95 of com.sun.squawk.Klass(bci=25)
[cRIO] at com.sun.squawk.Isolate.run(1506)
[cRIO] at java.lang.Thread.run(231)
[cRIO] in virtual method #47 of com.sun.squawk.VMThread(bci=42)
[cRIO] in static method #3 of com.sun.squawk.VM(bci=6)
[cRIO] edu.wpi.first.wpilibj.camera.AxisCameraException: No image available
[cRIO] at edu.wpi.first.wpilibj.camera.AxisCamera.getImage(AxisCamera.java:292)
[cRIO] at edu.wpi.first.wpilibj.templates.RobotTemplate.operatorControl(RobotTemplate.java:82)
[cRIO] at edu.wpi.first.wpilibj.SimpleRobot.startCompetition(SimpleRobot.java:118)
[cRIO] at edu.wpi.first.wpilibj.RobotBase.startApp(RobotBase.java:156)
[cRIO] in virtual method #10 of javax.microedition.midlet.MIDlet(bci=17)
[cRIO] at javax.microedition.midlet.MIDletTunnelImpl.callStartApp(64)
[cRIO] at com.sun.squawk.imp.MIDletMainWrapper.main(110)
[cRIO] in virtual method #95 of com.sun.squawk.Klass(bci=25)
[cRIO] at com.sun.squawk.Isolate.run(1506)
[cRIO] at java.lang.Thread.run(231)
[cRIO] in virtual method #47 of com.sun.squawk.VMThread(bci=42)
[cRIO] in static method #3 of com.sun.squawk.VM(bci=6)
[cRIO] Default disabled() method running, consider providing your own

2

You get the windriver error because the java files are actually wrapped C-code. Where is your camera plugged in? And did you do the setup utility so it can create the FRC user?

3

Follow the directions to change the camera configuration to allow anonymous connections.

4

I plugged the camera into port 2 of the cRIO. I realize that we are supposed to connect it into the router/bridge but I have close to no networking experience. I reset the camera and I manually went into the camera and added a user frc password frc. Would I still need to run the camera setup tool? How would I change the camera config to allow for anonymous connections?

5

There’s a check box on one of the pages. I don’t have the camera handy, so I can’t confirm where.

6