JNA
win32metadata
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JNA | win32metadata | |
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22 | 27 | |
8,219 | 1,273 | |
0.7% | 1.8% | |
7.8 | 0.0 | |
12 days ago | 7 days ago | |
Java | C++ | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
JNA
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FFM (Foreign Function and Memory API) Goes Final
As far as I understand it, with JNA, all calls into C code go through libffi: https://github.com/java-native-access/jna/blob/master/www/Fu...
This means that every call sets up some libffi data structures and libffi uses this information to perform the native call. Likewise in the other direction for return values. With JNI (and Panama), Hotspot can directly emit the argument/return code a the call, not too dissimilar from what a C or C++ compiler would do. There is still some overhead from maintaining JVM invariants. For example, I think a thread blocked in an FFI call can still participate in a safepoint. But that applies to JNI as well.
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Are there any Non-Mobile Kotlin Native libraries wrapping C libraries like libhidapi/opengl?
If you were prepared to go to the JVM you might try JNA. https://github.com/java-native-access/jna
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How to create fundamental libraries for my language?
Other good example, but for Java platform is JNA library. Do not mix it with Java's JNI, which is a bad example of how it could be done.
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Does Java 18 finally have a better alternative to JNI?
The complexity of JNI has given rise to some community-driven libraries that make it simpler to do FFI in Java. Java Native Access (JNA) is one of them. It's built on top of JNI and at least makes FFI easier to use, especially as it removes the need to write any C binding code manually and reduces the chances of memory safety issues. Still, it has some of the disadvantages of being JNI-based and is slightly slower than JNI in many cases. However, JNA is widely used and battle-tested, so definitely a better option than using JNI directly.
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JEP 419: Foreign Function and Memory API
This is about calling into any native operating system APIs, as long as they are callable via C or C++ (which these days means "all" operating system APIs).
JNI is somewhat harder to use, because you need custom glue on both sides of the border: Some custom classes in Java and some custom code on the C (and C++) side.
This proposal would remove the need for the glue on the C side and would allow a pure java solution.
Something like this has existed in third-party form for a while as JNA (https://github.com/java-native-access/jna), but now it's going to be built into the JRE itself (if the proposal passes through review)
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Choosing Java as your language for a Machine Learning project
I use JNA https://github.com/java-native-access/jna , as you can write the entire interface in Java faster as well as easier without the need of messing with the complexities of JNI.
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Creating GUI without framework or library
This (still someone else's code) will give you access to low level operating system APIs. For example, this will let you interact directly with the Windows COM, which lets you define interfaces and implement them: https://github.com/java-native-access/jna
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Obvious and possible software innovations nobody does
JNA looks reasonable for accessing native code from Java: https://github.com/java-native-access/jna/blob/master/www/Ge...
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Making Win32 APIs More Accessible to More Languages
I was the de facto maintainer of JNA (https://github.com/java-native-access/jna) win32 bindings for years. The API metadata is welcome - we have always based all work on header files in the visual studio / windows SDK. Now there’s a change to generate that code - someone might want to try to replace hand crafted mappings in JNA with generated ones - there’s a huge test suite to work with.
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Advanced AI
In case you have existing low level code in C/C++ and you want to integrate it with Java, there's https://github.com/java-native-access/jna But it's fairly unwieldy to work with, and calls Java=>C carry an overhead, so you want as few of them as possible. Which in ROTP means you want to transport all the relevant data into your AI code, then do the processing on a handful of calls, then return the result. Alternatively, an option would be to export say savegame (or other data) as JSON, run your AI module as a separate process, and then write the results to another file. While ROTP at the moment cannot do JSON save games, I have begun looking into it.
win32metadata
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Hey Rustaceans! Got a question? Ask here (18/2023)!
As /u/huellenoperator notes, that this needs a pointer to a mutable string comes straight from microsoft through win32metadata. Maybe it's a mistake on Microsoft's side, but if it's not you're taking big risks.
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Kernel Headers for Windows could soon make it into windows-rs
Microsoft offers official "bindings" to Win32 APIs through win32metadata. However, until recently, it did not include metadata for kernel-level functions or WDK. In early 2021, an issue was raised through windows-rs regarding this limitation, but progress was slow until now. Microsoft has finally released official metadata for WDK, which can be found on the wdkmetadata repository. The latest comment on the issue thread can be found here:
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winreader: read memory from other programs
for win32metadata's kernel api tracking issue, https://github.com/microsoft/win32metadata/issues/401
Small quirk, but this is Microsoft's official crate, based on their own win32metadata project! I've been using it preferentially now instead of the winapi crate since it's offically from MS, regularly updated, and more feature-rich in general.
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Best windows stubs
Any examples? Since the API bindings in windows-sys are generated from the metadata generated from official Windows SDK headers I'd not expect to see this kind of difference.
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Is it time to retire C and C++ for Rust in new programs?
There is still the occasional incredibly subtle link time fuckery in Rust.
https://github.com/microsoft/win32metadata/issues/1274
"Minor" semver updates to crates breaking things via e.g. unexpected MSRV bumps is pretty common too, with some resulting bitrot. That said, I agree with you that things in Rust are at least better. Imperfect, but better.
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Using Windows API in Julia?
It might be interesting to have bindings generated for the entirety of Win32 API through https://github.com/microsoft/win32metadata
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Would std code for Windows ever use the windows crate by Microsoft?
Note that the data (or the tool to extract the data) is publicly available under an open source license.
The Rust bindings are indeed generated from metadata, which provides several language projections, not only Rust.
What are some alternatives?
JNR - Java Abstracted Foreign Function Layer
JavaCPP - The missing bridge between Java and native C++
SWIG - SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.
panama-foreign - https://openjdk.org/projects/panama
rust-bindgen - Automatically generates Rust FFI bindings to C (and some C++) libraries.
Introducing .NET Multi-platform App UI (MAUI) - .NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.
Java-FFI-benchmarks - Benchmarks for Java JNI vs Project Panama on Linux with JDK 17
go - The Go programming language
sokol-zig - Zig bindings for the sokol headers (https://github.com/floooh/sokol)
winapi - Windows API declarations without <windows.h>, for internal Boost use.
java - Java bindings for TensorFlow