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Java wrappers and examples for the Windows UD library. The Windows UD library is the high-level Windows library/driver for the LabJack U3, U6 and UE9. For other LabJack devices, go to the page. JavaLJUD20150427.zip The latest and recommended Java wrapper and examples for the Windows UD driver. Requires JNA and supports 32 and 64-bit Java and UD driver. Refer to the download's README.txt for requirements, compile/run instructions, documentation and license information. Old JavaLJUD.zip The old Java wrapper and examples which are no longer updated.
Uses a JNI dll and only supports 32-bit Java and UD driver. Refer to the text file in the zip for more information. If you want to use the UD driver, or any other dll, and Java in general, you will need something like we provide in the download since Java requires JNI (Java Native Interface). Also, the UD driver this Java interface wraps is our high level driver, and is one of the easiest ways to interface with our UD devices (UE9/U3/U6). I've never used BlueJ Java before, but is there no way to load the dll in code and add the classpath to the jar file? An alternative to using the jar file in your project would be to extract the class files out of the jar and add them to your project.
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Note to keep the directory structure of the LJUDJava classes in your project (com labjack labjackud). You can extract the classes with the 'jar xf LJUDJava.jar' command. or to post comments.
Have you guys made progress on the 64 bit JNA library yet? I have a bunch of U6 pros and code running well in 32 bit java but the programs have a lot going on and I'd like to update to 64 bit for the extra memory capacity.
Just wanted to let you know i like your products and they work well for me. If you get the 64 bit library worked out I'll be buying more. If you wanted to do something else awesome I'd love to see a accessory board that is setup for direct measurement of Strain Gauge signals at 24 bit. I've been wanting to make an attempt at a prototype board with the AD7710 to simplify/expand my load cell and other strain gauge measurements but never get the chance.:-) Thanks, Chris. or to post comments. If you send us an email we can send the current JNA example which is 64-bit compatible. Unfortunately we haven't made much progress since our last post, but since you brought it to our attention again I can look into making a UD Java interface using JNA.
It would be comparable to our LJM driver's Java interface, but will use the UD functions. Note that it will use some JNA data types for parameters which will differ than the JNI interface we currently provide. I'll post again when that's available. If you are looking into getting additional LabJacks we do have the LabJack T7.
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It has cross-platform 32-bit and 64-bit Java support:. or to post comments. For the newly released Java LJUD wrapper to work on Linux would require us to port the Windows UD library/driver and update the Java wrapper.
The UD library/driver is for Windows only and is closed source. Currently we have no plans to port the UD library to other operating systems. For Linux and UD devices (U3, U6 and UE9), a different Java wrapper would be needed as the UD and Exodriver (Linux/Mac OS X library) functions are different. Linux user's will need to use their own JNI or JNA (recommended way) code with the Exodriver and its functions as we currently do not provide a Linux Java wrapper. The only cross-platform library (Windows, Linux, Mac OS X) with a Java wrapper that we provide is the LJM driver. At this time the LJM library only supports the Digit (didn't mention it in a previous comment) and T7, and will support future devices.
or to post comments. Yeah, I've looked at the exodriver, which is why I asked about the UD driver linux port.:) Although, I'm wondering if the LJM library is what I should have utilized instead of the Windows UD driver.
All I'm really after is the following methods below. Out of those methods, it looks like the ePut/eGet are the only two methods that don't have direct replacements in the LJM library. Do you have some examples of how I would use the LJM library to get the equivalent functionality as the ePut/eGet methods gave me? Int OpenLabJack(int DeviceType, int ConnectionType, String Address, int FirstFound, IntByReference Handle ); int ePut(int Handle, int IOType, int Channel, double Value, int x1); int eGet(int Handle, int IOType, int Channel, DoubleByReference pValue, int x1); void ErrorToString(int ErrorCode, ByteByReference pString); int ListAll(int DeviceType, int ConnectionType, IntByReference pNumFound, IntByReference pSerialNumbers, IntByReference pIDs, DoubleByReference pAddresses);.
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or to post comments. For reading and writing a single value using the LJM library there are the eReadName/Address and eWriteName/Address functions. With these functions you specify the Modbus Name (a string) or address of what you want to read/write on the device.