Trying to use lib compiled with 1.3.50 as dependency in project with 1.3.70-dev. It failed with : w: skipping .... htf-lib-a.klib. The abi versions don't match. Expected '[18]', found '14' w: The compiler versions don't match either. Expected '[]', found '1.3.50-release-11850' e: Could not find .... khtf-lib-a.klib" in [....] Does it mean that using older compiled libs is not possible?

Do C function pointer callbacks with pointer parameters always have the parameters mapped as CPointer rather that CValuesRef? Is this because they are called directly rather than through a KLib wrapper? Does this mean if passing in strings you have to allocate and free (or use getPointer within a memScoped)?

Trying to raise

NSException

from K/N (via

NSException.raise

) and catch it in ObjC. Unfortunately it is not catched and program still crashes. If I raise it in the same spot but in ObjC it is catched just fine. Is it a known problem? Hasn’t been able to find any info on the subject except for the one line in docs (https://kotlinlang.org/docs/reference/native/objc_interop.html#errors-and-exceptions):

Swift/Objective-C error-throwing methods aren’t imported to Kotlin as exception-throwing.

Wonder if someone can help me sanity check my conclusions here: I am using custom Swagger OpenAPI codegen libraries on an Android and iOS project. I also have a business logic library which uses only those models in the exposed interfaces. What I'm trying to do is make that business logic library into a Kotlin/Native library while not also converting the Swagger codeGen to MPP right now. What I can't figure out is if it is possible to share these models across platforms without going to a Swagger MPP implementation

Hi, I am having some issues with staticCFunction. See code below:

val identityBytes: ByteArray = someValue()
val pskBytes: ByteArray = someValue()

// <https://www.openssl.org/docs/man1.0.2/man3/SSL_CTX_set_psk_client_callback.html>

SSL_CTX_set_psk_client_callback(ctx, staticCFunction { ssl, hint, identity, maxIdentityLen, psk, maxPskLen ->
    require(identityBytes.size <= maxIdentityLen.toInt())
    require(pskBytes.size <= maxPskLen.toInt())

    identityBytes.forEachIndexed { index, value ->
        identity!![index] = value
    }
    pskBytes.forEachIndexed { index, value ->
        psk!![index] = value.toUByte()
    }

    // ...
    TODO()
})

When compiling this gives an error:

kotlinx.cinterop.staticCFunction must take an unbound, non-capturing function or lambda

I need to access identityBytes and pskBytes from this lambda. Is that possible?

does anyone know of a post that describes working with an opaque memory buffer (void*/COpaquePointer/NativePtr)?

Can someone point me to a good example of expect/actual typealiasing? Seems all examples I find either have all common code or very trivial (non-custom model) expect/actual usages

Why would you ever use toCValues instead of refTo since toCValues is so slow?

Hey guys, I am trying to compile a Kotlin/Native project for the JVM and MacOS. I have the source code, but no build configuration. Are there any tutorials on how to create the correct configuration?

anyone have any thoughts as to why accessing the result of

mmap

as a

CPointer<ByteVar>

would cause a SIGBUS?

What could be a reason that runBlocking{delay(10000); println(“after delay”)} does not delay?

Hello, could someone help with the following iOS exception? What might be the cause?

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared kotlin.collections.ArrayList@3edc938 from other thread
        at 0   MppLib                              0x000000010ce1c165 kfun:kotlin.Exception.<init>(kotlin.String?)kotlin.Exception + 85
        at 1   MppLib                              0x000000010ce1b4c5 kfun:kotlin.RuntimeException.<init>(kotlin.String?)kotlin.RuntimeException + 85
        at 2   MppLib                              0x000000010ce460d5 kfun:kotlin.native.IncorrectDereferenceException.<init>(kotlin.String)kotlin.native.IncorrectDereferenceException + 85
        at 3   MppLib                              0x000000010ce48058 ThrowIllegalObjectSharingException + 744
        at 4   MppLib                              0x000000010cff3d79 _ZNK16KRefSharedHolder14verifyRefOwnerEv + 185
        at 5   MppLib                              0x000000010d000efc -[KMutableListAsNSMutableArray dealloc] + 44
        at 6   libobjc.A.dylib                     0x00007fff50bad0d6 _ZN11objc_object17sidetable_releaseEb + 174
        at 7   libobjc.A.dylib                     0x00007fff50bae75b _ZN19AutoreleasePoolPage12releaseUntilEPP11objc_object + 147
        at 8   libobjc.A.dylib                     0x00007fff50bae67a objc_autoreleasePoolPop + 199
        at 9   libobjc.A.dylib                     0x00007fff50bae9c4 _ZN19AutoreleasePoolPage11tls_deallocEPv + 112
        at 10  libsystem_pthread.dylib             0x00007fff51bfe6ab _pthread_tsd_cleanup + 551
        at 11  libsystem_pthread.dylib             0x00007fff51c01655 _pthread_exit + 70
        at 12  libsystem_pthread.dylib             0x00007fff51bfe2f6 _pthread_body + 137
        at 13  libsystem_pthread.dylib             0x00007fff51c01249 _pthread_start + 66
        at 14  libsystem_pthread.dylib             0x00007fff51bfd40d thread_start + 13
(lldb)

Why would companion objects be recycled on iOS？ How to solve this?

if I have a

val stat = cValue<stat>()

, and I want to pass it to the

stat

funciton , which takes a

stat*

, do I need to use

getPointer

? the posix binding accepts a

CValuesRef

. i just want to pass a pointer to the stack variable.

Does anyone here have experience with K/N and macOS, particularly around selectors? Nowhere I’ve looked so far has given the answer I need.

Hey, I try to convert the following swift code to Kotlin. It compiles perfectly, but I get a Nullpointer error at runtime: Swift:

private var readStream: Unmanaged<CFReadStream>?
private var writeStream: Unmanaged<CFWriteStream>?
private var inputStream: InputStream?
private var outputStream: OutputStream?

func connect(
        hostname: String,
        port: Int32,
        callback: @escaping (_ dataTransferObject: DiagnoseViewDataTransferObject) -> Void
 ) {
        let host = CFStringCreateWithCString(kCFAllocatorDefault, hostname, CFStringBuiltInEncodings.UTF8.rawValue)
        CFStreamCreatePairWithSocketToHost(
            kCFAllocatorDefault,
            host,
            443,
            &self.readStream,
            &self.writeStream
        )

	inputStream = readStream?.takeRetainedValue()
       outputStream = writeStream?.takeRetainedValue()
       inputStream!.delegate = self
       outputStream!.delegate = self
    }

---------------- In Kotlin I have the following:

private var readStream: CValuesRef<CFReadStreamRefVar>? = null
private var writeStream: CValuesRef<CFWriteStreamRefVar>? = null
private var inputStream: NSInputStream? = null
private var outputStream: NSOutputStream? = null

fun connect(
        hostname: String,
        port: Int,
        callback: (dataTransferObject: DiagnoseViewDataTransferObject) -> Unit
 ) {
        val host = CFStringCreateWithCString(kCFAllocatorDefault, hostname, kCFStringEncodingUTF8)
        CFStreamCreatePairWithSocketToHost(
            alloc = kCFAllocatorDefault,
            host = host,
            port = 443,
            readStream = this.readStream,
            writeStream = this.writeStream
         )  
        inputStream = readStream as NSInputStream?
        outputStream = writeStream as NSOutputStream?
        inputStream!!.delegate = this //crashes here with Nullpointer
        outputStream!!.delegate = this

}

Someone can help me how to use CFStreamCreatePairWithSocketToHost from Kotlin?

someone know in what cases K/N failed with

Receiver of 'initBy' must be a 'this' of the constructed class

? class is simple:

@ExportObjCClass
class MyTableViewCell : UITableViewCell {

    @OverrideInit
    constructor(
        style: UITableViewCellStyle,
        reuseIdentifier: String?
    ) : super(style = style, reuseIdentifier = reuseIdentifier)

    @OverrideInit
    constructor(coder: NSCoder) : super(coder = coder)
}

Long shot, has anyone used the BigNum library (https://github.com/ionspin/kotlin-multiplatform-bignum) for MPP BigInteger/BigDecimal support?

I am working on an App for Android and iOS and implemented some requests with ktor httpclient and coroutines. I want to write tests in the framework for suspended functions. I read about that it’s not implemented yet but there is a work around:

expect fun <T> runTest(block: suspend () -> T)
JVM
actual fun <T> runTest(block: suspend () -> T) {
    runBlocking { block() }
}

https://blog.kotlin-academy.com/testing-common-modules-66b39d641617 https://youtrack.jetbrains.com/issue/KT-22228 How would I implement this vor the Native side? Or is there an better solution to this problem.

Is downcasting supported via reverse C interop? For example, given the following Kotlin definitions,

interface Interface {
    fun foo(): Int
}

class Concrete : Interface {
    override fun foo() = 42
    fun bar() = 1337
}

fun getInterface(): Interface = Concrete()

is it legal to check

IsInstance

and "cast" by using the pinned interface pointer as the concrete type?

KotlinInterfaceTest_ExportedSymbols* lib = KotlinInterfaceTest_symbols();
auto sample = lib->kotlin.root.sample;

KotlinInterfaceTest_kref_sample_Interface interface = sample.getInterface();
if (lib->IsInstance(interface.pinned, sample.Concrete._type()))
{
    auto concrete = KotlinInterfaceTest_kref_sample_Concrete{ interface.pinned };
    printf("Call concrete method: %d\n", sample.Concrete.bar(concrete));
}

This seems to work (prints "Call concrete method: 1337"), but want to make sure I'm not relying on undefined behavior. Thanks!

Trying to use island-time library. My iOS build is failing due to not being able to find 'stately-collections. The island-time library does in fact use this: https://github.com/erikc5000/island-time/blob/master/core/build.gradle.kts However, it's delcared as implementation so I'm not sure why the build would be complaining that it can't find it in my module. I'm including the library by defining the common artifact and enabling GRADLE_METADATA

https://github.com/JetBrains/kotlin-native/pull/3498 got merged, so now K/N have native SIMD vector type

Vector128

along with interop support, so frameworks like

ModelIO

and

SpriteKit

now expose APIs with SIMD types like

vector_float3

.

This message was deleted.

Error message when try to run xcode 11+ app

Has anyone had the issue where Android Studio just stops syntax highlighting the android-app submodule?

After migrating from version 1.3.50 of the multiplatform plugin to 1.3.60, having '<' as the first char of a backtick-quoted identifier causes the task :linkReleaseExecutableLinux to fail.

the

os_log

function appears to be missing from the iOS platform bindings

Still getting

Unable to compile C bridges

with Kotlin/Native 1.3.60. Referring to https://github.com/JetBrains/kotlin-native/issues/2674, shouldn't this have been fixed with the LLVM toolchain update?

I'd like to migrate a C++-application (with dependencies) to a new Kotlin codebase (multiplatform eventually). What is the most practical way to do this? I read some global thinks about C-interop, NDK and Kotlin/native. Should I include/interface the C-lib in a new Kotlin project? Or should I include the Kotlin project into the C-codebase until everything is rewritten and testen in Kotlin? Any best practices?