Hi. Can anybody give link to simple example of using C struct in Kotlin Native code? For example, I ...

# kotlin-native

[rjhdby]

Hi. Can anybody give link to simple example of using C struct in Kotlin Native code?
For example, I have someHeader.h

struct my_strucs{
    uint32_t id;
   char * name;
}

What can I do for using it in Kotlin code?

[olonho]

Put struct declaration to the .def file after —- separator, or refer someHeader in headers section of the .def file, and then run cinterop tool on such def file. Please read INTEROP.md.

[rjhdby]

It's described in docs, but how to use this struct inside .kt?
I already understood that it is converted into a class. In my case like

package someHeader
class my_struct(rawPtr : NativePtr) : ...

But I can't find any docs about creating NativePtr

[olonho]

How do you want to use it? If some C function takes my_strucs* parameter then bridge will automatically produce structure class out of the pointer. And generally, calling C function or calling alloc is pretty much the only way to get C structure.

[olonho]

see for example https://github.com/JetBrains/kotlin-native/blob/dfc01847c5ba3ebba81c7bda07f14c185f481296/samples/videoplayer/src/main/kotlin/SDLAudio.kt#L45

[rjhdby]

I try to study interop between KN and C, and very distressed by docs 🙂

Currently I try to create C-struct in KN function and return it to C-function

[olonho]

Exactly what happens in sample above

[rjhdby]

Yes, I see. Thank you!