Do folks here prefer using IntelliJ IDEA for writing Kotlin Native over Android Studio?

Is there a way to add C definitions for a built-in C library (varies by Kotlin Native target) without having to do monkey patching (https://en.wikipedia.org/wiki/Monkey_patch)?

Anyone else experienced any issues with NSObjects never being deallocated on macOS? This seems like a very serious issue as it means any application that uses NSObjects is exposed to memory leaks. I created an issue to track but it would be great to know if anyone else experiences this behavior. If so it would be great to upvote to gain exposure 🙂 https://youtrack.jetbrains.com/issue/KT-33780

This message was deleted.

General question here: since Kotlin/Native supports exporting iOS frameworks that get compiled to Objective-C, is it preferable to develop host applications that use the framework in Objective-C as well instead of Swift? Are there any known issues with using K/N-compiled Objective-C frameworks in Swift?

Hi there!, Have a question about K/N. Is it possible to use it as a replacement for JNI?. I have a cross-platform written in C/C++ library that I use for ios/android, Can I call this library from an Android application using Kotlin/Native?

What should I write in Kotlin that would result in a static class function seen from Swift?

I’ve got a

kotlin.native.concurrent.InvalidMutabilityException

that I can’t explain.

companion object {

        internal var xs: Set<X> by atomic(HashSet())
            private set

        fun registerX(x: X) {
            xs = xs + x
        }

    }

atomic

being:

inline fun <reified T> atomic(initial: T) = AtomicDelegate(initial)

AtomicDelegate

being:

class AtomicDelegate<T>(initial: T) : ReadWriteProperty<Any?, T> {

    private val atomic = AtomicReference(initial)

    override fun getValue(thisRef: Any?, property: KProperty<*>): T =
        atomic.get()

    override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
        atomic.set(value)
    }

}

And

AtomicReference

here is:

internal actual class AtomicReference<T> actual constructor(initial: T) {

    private val atomic =
        kotlin.native.concurrent.FreezableAtomicReference(initial)

    actual fun get(): T =
        atomic.value

    actual fun set(newValue: T) {
        atomic.compareAndSet(get(), newValue)
    }

}

The app crashes when

registerX

is called:

Uncaught Kotlin exception: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlin.collections.HashSet@221c288

Where in my code am I attempting to modify a frozen

HashSet

? I’m pretty sure I’m just creating a new local one, modifying it, then assigning it which makes it frozen (that’s what the

+

does)

There might be an issue with the Stub generator which causes ObjC properties prefixed with

new

to produce non compiling code, I created an issue https://github.com/JetBrains/kotlin-native/issues/3336 in case others are also experimenting with using Cocoapods dependencies and hitting an `this annotation is not applicable to target 'getter'`…

I have code in an iosMain source set that's shared between the iosArm64 and iosX86 targets. With this setup, I'm not able to get code completion for iOS platform calls in Intellij. Is there a way to instruct it to use one of the two iOS targets just for the purposes of code completion in the editor?

Does anyone know when

1.3.60

will be out? I need to support more than 22 properties in SQLDelight... https://github.com/JetBrains/kotlin-native/issues/3072

Hi, is there a way to try/catch an

IncorrectDereferenceException

? I want to use the iOS CMAltimeter class, but it's callback gets called from a non-main-thread when

altimeter?.stopRelativeAltitudeUpdates()

is called. I tried a surrounding

try

and

catch

, but no luck. I can not freeze the callback, because that would freeze

update()

too. I really don't know what else to do right now.

altimeter = CMAltimeter()
            altimeter?.startRelativeAltitudeUpdatesToQueue(NSOperationQueue.mainQueue) { data: CMAltitudeData?, error: NSError? ->
                update(data.pressure.doubleValue)
            }

Can the relaxed mode help? If so, how to enable it?

I have a feeling there may be some potential memory leak with the way Kotlin objects are converted to Obj-C objects. I have a simple class in Kotlin that is the following:

class Agent(
    val var1: String,
    val var2: String,
    val var3: String,
    val var4: String,
    val var5: String,
    val var6: String,
    val var7: String,
    val var8: Boolean = false,
    val var9: String? = null,
    val var10: String? = null
)

And simply allocating it in Swift, i.e.,

var agent = Agent(...)

sometimes results in a memory leak. This even happens when all I do is allocate the object and nothing else references it. The same behavior applies when I put the object declaration in an autoreleasepool. Below is an image of what Xcode’s debug memory graph shows occasionally when there’s a leak.

I'm not sure what I'm missing but I can't seem to use outside libraries in kotlin native. I also can't find any gradle documentation that would let me use that, nor any examples that use kotlin gradle scripts to interop with an outside library.

I need some help with coroutines. I get that kotlin native only support coroutines on the main thread. But it should be possible to execute a background task (for example a http request) without blocking the ui right? I tried to create a simple task that uses the Dispatchers.Main but then the ui is blocked. Here is my code:

How close are the different compiler platforms (jvm, js, and native) to sharing the same backend? I feel like this may have been done a while ago, but I haven’t heard anything.

Printing a Kotlin/Native object that is exported to an Objective C framework in Swift yields the object name and address, but printing the address of it the Swift way is always that address offset by 0x28. Any idea why this is?

let a: MyType = ...
print(a) // MyType@c56528
print(Unmanaged.passUnretained(a).toOpaque()) // 0x0000000100c56500

The second print should print the address of

a

, whereas the first would just be the default toString for Kotlin objects, I don’t know why the addresses are slightly offset though.

Hi, I want to add dev sdk

plugins {
    id 'org.jetbrains.kotlin.multiplatform' version '1.3.60-dev-1981'
}
repositories {
    maven {
        url '<https://dl.bintray.com/kotlin/kotlin-dev/>'
    }
}

But it is error

Plugin [id: 'org.jetbrains.kotlin.multiplatform', version: '1.3.60-dev-1981'] was not found in any of the following sources:
Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.jetbrains.kotlin.multiplatform:org.jetbrains.kotlin.multiplatform.gradle.plugin:1.3.60-dev-1981')
  Searched in the following repositories:
    Gradle Central Plugin Repository

How to do to fix it? Thanks

Trying to call a C function (

cfg_init

from libconfuse) that is expecting a

CValuesRef<cfg_opt_t>?

as the first argument. Using the

cValuesOf

function returns

CValues<CPointerVar<cfg_opt_t>>

which doesn't match. Below is the sample code:

val targetStr = configString(name = "target".cstr, def = "NONE".cstr, flags = CFGF_NONE)
val end = configEnd()
val config = cfg_init(cValuesOf(targetStr, end), CFGF_NONE)

Trying to figure out what character encoding is being used for terminal input. Writing the terminal input to a file as

CPointer<ByteVar>

works fine, however if the terminal input is written as a Kotlin String (eg

data.cstr

) then the text in the output file looks garbled.

Hi, I have a question about ByteArray and toMutableList() method, on new Kotlin 1.3.50 when i do (in Common):

val bytes = byteArrayOf(1)
val mutableBytes = bytes.toMutableList()

It works fine, but if a byteArray contains negative value i got a crash on iOS (on Android works fine). It's easy to reproduce, example:

val bytes = byteArrayOf(-1)
val mutableBytes = bytes.toMutableList() /* got a crash here on iOS */

Does anybody have this issue?

Hey guys, I'm working on iOS app with K/N framework and everything worked just fine untill I've added a cinterop Keychain wrapper written in ObjectiveC. Right now I'm getting

bitcode bundle could not be generated because (...) was built without full bitcode.

when trying to build an archive of my app. Has anybody faced something like this before?

Hello, what can I use on K/N to build simple GUI for linux/windows?

Hi, Am I understand correctly the memory management in K/N that everything I write in a common package will automatically be released if the code in objective c does not have references to objects created by kotlin?

Sometimes calling

GC.collect()

results in

Memory.cpp:987: runtime assert: Must be positive

Hi, if there is a “fun A(){…. return “” }” in my androidNativeArm64 now, there is also a “fun A(){…. return “”}” in my androidNativeArm32 This two fun A is all the same How can i write once for two platform ( Because import java.XXX, can’t write in commomMain )???? Thanks

What memory considerations would need to be taken into account with a Kotlin String? Have a situation where a C library that is being used (termios - https://en.wikibooks.org/wiki/Serial_Programming/termios ) takes a buffer (

CPointer<ByteVar>?

) for reading data, that is converted to a Kotlin

String

to do text manipulation, and is converted back to

CPointer<ByteVar>?

(via the

cstr

property) where it is written to a file.

Hi, Is it possible to write once with my “compilations.main.cinterops” block for android/ios

targets {
        // Android Arm64 Platform (Parent Platform)
        androidNativeArm64("androidNativeArm64")

        // Android Arm32 Platform
        androidNativeArm32("androidNativeArm32")

        // Configure Android
        configure([androidNativeArm64, androidNativeArm32]) {
            compilations.main.cinterops {
                XXXXXX
            }

            binaries {
                sharedLib {
                    baseName = "AndroidNative"
                }
            }
        }

        // *********************************************************

        // iOS Arm64 Platform (Parent Platform)
        iosArm64("iOSArm64")

        // iOS X64 Platform
        iosX64("iOSX64")

        // Configure iOS
        configure([iOSArm64, iOSX64]) {
            compilations.main.cinterops {
                XXXXXX
            }

            binaries {
                framework {
                    baseName = "iOS"
                }
            }
        }

        // *********************************************************

        // JVM Platform
        jvm()
    }

Thanks

Hi, How to get targets alias ? Thanks like “${project.name}” Because I want basename is different

binaries {
                sharedLib {
                    baseName = iOSArm64 or iOSX64
                }
            }

I have a configuration requirement when setting up iOS in gradle, where I want both the iosArm64 + iosX64 target to get built at the same time, but only want to configure everything for the target once. I have managed to configure both targets at one place, but now all my code inside iosMain will become red. I will paste it inside this thread in order not to spam the channel with code. How can i configure both my targets at one place, code in one place, but still set up iosMain properly without extra configuration?