Hi all 👋 hope you're having a great Tuesday. I've recently given a few talks around Kotlin/Native. Many found them quite useful, so I've summarized the content into a set of tutorials, which you can find here: www.learnkotlinnative.com It'd be great to get some feedback/constructive criticism around the content or some pointers on how to improve it further. Many thanks!

I've got an unusual request. Kotlin native has a very good perspective. The problem for myself and large part of scientific community is that we have to work with C++ libraries. Kotlin-Native does not have automatic interop with C++ libraries and there are few good reasons for it. Still, does anyone have experience with wrapping C++ libraries? If it is possible, could someone write a tutorial?

is there a way to consume Kotlin Native on iOS, without having to disable bitcode?

What type do people use to pass raw data back and forth between the K/N and iOS/Android?

ByteArray

?

Why does

Float

and

Double

not have

.SIZE_BYTES

property when Int, Long and other primitives do?

Made a podspec today that can run gradle to generate the ios framework and properly integrates it into our project

sorry to repeat the message I wrote to #multiplatform , but I hope someone here could help me: https://kotlinlang.slack.com/archives/C3PQML5NU/p1547114865149400

Thank you 🙏

Where's the best place to file K/N bugs? youtrack or GH?

Hi guys, I am using Kotlin multiplatform 1.3.11 and I am working on a android/iOS library. I have trouble with some of the crypto related functions on iOS. So far I manage to successfully use CCCrypt, CCCryptorCreate, CCCryptorUpdate and CCCryptorFinal. However when I try to use asymmetric encryption method such as SecKeyCreateRandomKey I got a signal 11: Segmentation fault. Worth mentioning that I am testing those methods via unit test witch launch an iOS simulator without UI. I read that some other people had issue with encryption method and Kotlin native so maybe these are related?? If any of you has an idea ? And also how is it best to debug ? Can I debug Kotlin native code? How can I have a stacktrace or something that will help me identifying the root cause. I know for sure that the call that fails is SecKeyCreateRandomKey regardless of all the parameters variations i tried I always get a segmentation fault.

is there a way to add custom linker flags to a test binary in mpp projects? seems like

linkerOpts

inside the test

KotlinNativeCompilation

are ignored when it comes to linking the test debug executable.

Anyone else see the IDE redownload a ton of pom/module files whenever you sync a project with K/N?

I think its a gradle metadata bug but its also kinda weird that K/N downloads so many binaries that I dont have any dependencies on

Is it possible to implement SSL cert pinning using ktor on an iOS project?

Is there a sample Kotlin Native KLib project (not a Android/iOS one, preferably Linux) which uses the Kotlin Multiplatform plugin? Can generate a KLib for the library but cannot access the KLib dependency in the library itself.

Not 100% sure what you mean with "data stream", but there's

ByteReadChannel

and

ByteWriteChannel

in

<http://kotlinx.coroutines.io|kotlinx.coroutines.io>

, which might be what your're looking for.

Hi all, I'm starting a new knative project (I have previous kotlin-jvm) experience, and I need to manipulate files quite a bit, and noticed that those are dependent on platform using fopen, is there a plan to create a multiplatform abstraction around the File concept to be multiplatform as well?

but I'm unable to import

kotlinx.cli.*

on my main Kt file

Are there any supported profilers for Kotlin/Native on Windows? I tried http://www.codersnotes.com/sleepy/ but I cannot see the function names - only addresses.

Hi guys! Is there a way to produce iOS framework with both arm32 and arm64 architectures? I'm having hard time with app archive..

Has anyone tried AppCode recently with Kotlin/native? I'm wondering what the state of integrating UI with Kotlin is now? When I checked it out a while back, it wasn't great and I was having to manually edit xcode files to get things to work. Is that still the case?

Hi! I'm playing around with KN and hit this error:

src/nativeMain/kotlin/godot/core/Vector2.kt:10:13: error: invocation of C function pointer with return type 'CValue<*>' is not supported yet

Is it tracked somewhere? Tried searching in github and youtrack but with no luck.

Has anybody tried to use Kotlin/Native with Rust librairie? Is it possible to use C interrop for that use case? I would be interested to combine both with Kotlin/Native for applications/business logic and Rust for high performance libraries like parsing etc. on server side.

Hello! Quick question: protocols are imported in Kotlin as interfaces with Protocol name suffix, i.e.

@protocol Foo -> interface FooProtocol

. Why? I guess this is a question for the designers of Kotlin/Native but I’m just wondering what is the reason behind that. My opinion is that this is unnecessary and I would prefer this to be transparent and just use the interface with the original protocol name. I do not see why we should be aware about the fact that it comes from a framework.

Hi! Let's say I have kotlin data class

data class DataClassTest(val foo: String = "foo", val bar : Int = 1)

So in kotlin code I can initialize it with default properties like

DataClassTest(foo = "bar")

But when I try to use it the same way in swift

DataClassTest(foo : "bar")

I get an error "Cannot invoke initializer for type 'DataClassTest' with an argument list of type '(foo: String)'" Am I missing something?

When a Kotlin Native library is published (via the publishToMavenLocal Gradle task) locally where are the artifacts stored❓ There is a publications directory with the following structure (has multiple module.json and pom-default.xml files): publications/ ├── kotlinMultiplatform │ ├── module.json │ └── pom-default.xml ├── linux │ ├── module.json │ └── pom-default.xml └── metadata ├── module.json └── pom-default.xml

Is there a "global" equivalent of memScoped?

I have encountered a puzzling issue where a InvalidMutabilityException is thrown when a function is invoked on a Object (not to be confused with a class object): ----------------------------------------------------- Uncaught exception from Kotlin's main: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen org.digieng.gobject_meta.NamespaceInfo@167e938 at ThrowInvalidMutabilityException (0x2406f9) at (0x24f4e6) at kfun:org.digieng.gobject_meta.NamespaceInfo.clearState#internal (0x258a00) at kfun:org.digieng.gobject_meta.NamespaceInfo.load(kotlin.String;kotlin.String) (0x256777) at Konan_start (0x21bac2) at Konan_run_start (0x21b870) at Konan_main (0x21b7a7) at __libc_start_main (0x7f15dd833f45) at (0x21b029) at ((nil)) -----------------------------------------------------