Foreign API interop with C++
I want to know if theres any way to load/use C++ class from Java?
26 Replies
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full blown C++ might be hard, but for C functions I use JNA
Im looking exclusively for C++ interop, since with C i can already accomplish it with jextract/foreign api
For C++, you might need to write some JNI adapters unfortunately
Although I think there's a foreign function api coming
Oracle Help Center
Core Libraries
An upcall is a call from native code back to Java code. An upcall stub enables you to pass Java code as a function pointer to a foreign function.
This
But also pretty C based
You could probably do C++ interop, but you'd need different names for different OSes, as C++ uses name mangling, plus code in headers only is lost
i think you don't understand what i want, i know how to use foreign memory api. ff memory api doesnt yet support c++ classes
yeah, like I said, C++ uses name mangling
So you'd need the correct function names, the correct setup for classes etc
probably easier to write a C wrapper around it, and then call that
Which C++ library are you trying to interact with?
winui3
ah, the new UWP, yeah, that's definitely going to be painful to do
If not straight up impossible
yeah no problem i can scrape it, thats no problem
it just came up in my mind
if it would be possible
Codename One
Java Developers can FINALLY Target Windows UWP - Codename One
The whole source of this port as well as our changes to iKVM are available in our git repository.
I found this
that looks cool
no idea if it's free or anything
well, for UIs I use flatlaf nowadays, nice layer on top of swing
got that intellij vibe
i like flatlaf as well
yeah exactly
thats what i though
?
if anything, c++ will be easier
just slap an extern "C" JNIEXPORT on the exported jni function and no mangling will be done
yeah, you have to write JNI...
yeah..?
but yet, its not possible with foreign memory api?¨
that’s a given if you want c++ code to interact with java, no?
what exactly do you want to do in what direction
do you want c++ code to call java code? do you want java code to call c++ code and be able to provide a native callback that goes back to java code?
use jextract to create calls to the winui3 library, basically access winui classes from java
jna or ffi
ffi
you can just bind native methods found via a linker to a methodhandle and invoke that with the native params gotten from the memory area
basic ffi
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