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OpenHardwareMonitor + JNI4Net

This project enables the usage of OpenHardwareMonitorLib.dll on Java. OpenHardwareMonitor mainly uses visitor pattern in it's API. Which is great, but not so great when you try to use it with JNI4Net. On top of that JNI4Net currently does not support generics. Therefore, this project simply wraps OpenHardwareMonitor and exposes an API such as: GetCpu, GetGpu and GetDisks.

Building the C# library

This should be as easy as any other C# library project. There is a simple console based application that you can use to quickly test out stuff.

Building the Proxy .dll and .jar files using Proxygen

Now here's the tricky part. Since there are so many different factors at play.

Proxygen works with either .NET 2.0 or .NET 4.0. So make sure you have the right version of the csc compiler. My Windows 10 machine came with v4.0.30319 and the csc executable was located at C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe

Also make sure you have a new JDK installed. JDK8 is fine.

Take a look at the Proxygen directory in this repo. Due to licensing and practical reasons, a few binaries are missing from this directory. You can find them over at JNI4Net's repo and Open Hardware Monitor's repo respectively.

  • OhmJniWrapper.dll (the artifact from this repo)
  • proxygen.exe
  • proxygen.exe.config
  • OpenHardwareMonitorLib.dll
  • jni4net.n-0.8.8.0.dll
  • jni4net.n.w32.v20-0.8.8.0.dl
  • jni4net.n.w64.v20-0.8.8.0.dll
  • jni4net.n.w32.v40-0.8.8.0.dll
  • jni4net.n.w64.v40-0.8.8.0.dll
  • jni4net.j-0.8.8.0.jar

Once you have downloaded all the required binaries, you can run the generateProxies.cmd. It should generate a bunch of files in the work directory.

The file of interest is build.cmd which is used to run the final product. This file contains calls to both the java compiler, the jar packager as well as the C# compiler. A reference to OpenHardwareMonitorLib.dll also need to be added to the .NET compiler call.

If you are like me and don't have a proper path setup in Windows you probably also need to provide absolute paths to the compilers.

I've included a build.cmd.example for reference where I've switched out the executable calls to their absolute path versions as well as added the reference to OpenHardwareMonitorLib.dll in the call to csc.exe.

Once it's built you will end up with two files: OhmJniWrapper.j4n.jar and OhmJniWrapper.j4n.dll. Stick those together with the files listed above except proxygen.exe and proxygen.exe.config in a lib folder in your java project.

Take a look at MonitorManagerFactory and neighbouring classes to find out how to use the lib from Java.