Java for LJM - Windows, Mac, Linux

Prerequisites

• LabJack T7 or T4
• LJM Library - Install the LJM Library
• Java 5.0 or newer. - Download from https://www.oracle.com/
• JNA library - Version 4.5 included. Download from https://github.com/twall/jna
• Operating system - Windows, Mac OS X, Linux

Instructions

1. Go to the T4 or T7 Quickstart Tutorial and follow the steps to install LabJack software and confirm basic operation.
2. Download/extract the .zip file attached at the top of this page.
3. To compile and run the Java examples use the javac compiler and java interpreter. You will need to use the "-classpath" option to add the ljm.jar and jna.jar to the build/class path.
4. To demonstrate, open a terminal, navigate to the Java_LJM\examples directory and run the following command for the EReadName example:
   
   Windows

       javac -classpath .;..\jar\jna.jar;..\jar\ljm.jar EReadName.java
       java -classpath .;..\jar\jna.jar;..\jar\ljm.jar EReadName

   Mac OS X/Linux

       javac -classpath .:../jar/jna.jar:../jar/ljm.jar EReadName.java
       java -classpath .:../jar/jna.jar:../jar/ljm.jar EReadName
   

Refer to the download's README.TXT file for requirements, compile/run instructions, documentation and license information.

Code Snippet

import java.text.DecimalFormat;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.DoubleByReference;
import com.labjack.LJM;
import com.labjack.LJMException;
public class ReadSerialNumber {
    public static void main(final String[] args) {
        try {
            IntByReference handleRef = new IntByReference(0);
            int handle = 0;
			
            //Open first found LabJack
            LJM.openS("ANY", "ANY", "ANY", handleRef);
            handle = handleRef.getValue();
			
            //Call eReadName to read the serial number from the LabJack.
            String name = "SERIAL_NUMBER";
            DoubleByReference valueRef = new DoubleByReference(0);
            LJM.eReadName(handle, name, valueRef);
            System.out.println("\neReadName result: ");
            System.out.println("    " + name + " = "
                + new DecimalFormat("#.#").format( valueRef.getValue() ));
        }
        catch (LJMException le) {
            le.printStackTrace();
        }
    }
}

File list

Java_LJM_2017_12_04.zip contains:

LICENSE.txt
README.txt
doc\allclasses-frame.html
doc\allclasses-noframe.html
doc\constant-values.html
doc\deprecated-list.html
doc\help-doc.html
doc\index-all.html
doc\index.html
doc\overview-tree.html
doc\script.js
doc\serialized-form.html
doc\stylesheet.css
doc\com\labjack\LJM.Constants.html
doc\com\labjack\LJM.Errors.html
doc\com\labjack\LJM.html
doc\com\labjack\LJM.LabJackM.html
doc\com\labjack\LJMException.html
doc\com\labjack\package-frame.html
doc\com\labjack\package-summary.html
doc\com\labjack\package-tree.html
examples\LJMUtilities.java
examples\Basic\EAddresses.java
examples\Basic\ENames.java
examples\Basic\EReadAddress.java
examples\Basic\EReadAddresses.java
examples\Basic\EReadName.java
examples\Basic\EReadNames.java
examples\Basic\EWriteAddress.java
examples\Basic\EWriteAddresses.java
examples\Basic\EWriteName.java
examples\Basic\EWriteNames.java
examples\More\AIN\DualAINLoop.java
examples\More\AIN\SingleAIN.java
examples\More\AIN\SingleAINWithConfig.java
examples\More\Config\ReadConfig.java
examples\More\Config\ReadDeviceNameString.java
examples\More\Config\WriteDeviceNameString.java
examples\More\Config\WritePowerConfig.java
examples\More\DIO\SingleDIORead.java
examples\More\DIO\SingleDIOWrite.java
examples\More\DIO_EF\DioEfConfig1PwmAnd1Counter.java
examples\More\Ethernet\ReadEthernetConfig.java
examples\More\Ethernet\ReadEthernetMac.java
examples\More\Ethernet\WriteEthernetConfig.java
examples\More\I2C\I2CEeprom.java
examples\More\ListAll\ListAll.java
examples\More\SPI\SPI.java
examples\More\Stream\StreamBasic.java
examples\More\Stream\StreamBasicWithStreamOut.java
examples\More\Stream\StreamBurst.java
examples\More\Stream\StreamSequentialAIN.java
examples\More\Testing\CRSpeedTest.java
examples\More\Watchdog\ReadWatchdogConfig.java
examples\More\Watchdog\WriteWatchdogConfig.java
examples\More\WiFi\ReadWiFiConfig.java
examples\More\WiFi\ReadWiFiMac.java
examples\More\WiFi\ReadWiFiRssi.java
examples\More\WiFi\WriteWiFiConfig.java
jar\jna.jar
jar\ljm.jar
src\build_ljm.bat
src\Manifest.txt
src\com\labjack\LJM.java
src\com\labjack\LJMException.java