Hello! Learning about cinterop-related types and s...

# multiplatform

[Vadim]

Hello! Learning about cinterop-related types and still can't get them right.

In the code below, how should I define error variable on the Kotlin side to call this C function?

int analyze(char **error);

[Vadim]

Related kotlin code:

actual class Analysis {
    actual fun perform(): Int {
        
        val errorPointer = ???

        // type of `error` parameter is decompiled as `CValuesRef<CPointerVar<ByteVar>>?`
        val result = analyze(errorPointer)

        return result
    }
}

[hfhbd]

This is copied from my Objective C CoreData usage, but maybe it could help you too:

fun <R> withErrorPointer(block: (CPointer<ObjCObjectVar<NSError?>>) -> R): Result<R> = memScoped {
    val errorPointer: ObjCObjectVar<NSError?> = alloc()
    val pointer = errorPointer.ptr

    val result = block(pointer)
    val error = pointer.pointed.value
    return if (error != null) {
        Result.failure(CoreDataError(error))
    } else {
        Result.success(result)
    }
}