👋 Hello, team!

Hi, I am trying to add a pod the my kotlin native project with the cocoapods plugin. I keep getting errors no matter how I try to resolve it. the pod I am adding is GroundSdk. Can someone help ?

Hi, I'm dipping my toes in the K/N pond and I'd like to have any basic mistakes be pointed out early. Would you please look at the following piece of code and tell me if there's anything fundamentally wrong with my mental model? `iosMain`:

internal actual fun encode(text: String, charset: Charset): ByteArray {
  var cfCharsetName: CPointer<__CFString>? = null
  try {
    // (1) Cast a NSString as CFStringRef for the CF lookup function.
    //     The BridgingRetain function will transfer the ownership to us,
    //     making us responsible for freeing the memory.
    cfCharsetName = CFBridgingRetain(charset.ianaName as NSString) as CFStringRef?

    // (2) Using the prepared CFStringRef, find the CFStringEncoding.
    val cfEncoding = CFStringConvertIANACharSetNameToEncoding(cfCharsetName)
    if (cfEncoding == kCFStringEncodingInvalidId) {
      throw RuntimeException("invalid encoding: ${charset.ianaName}")
    }

    // (3) Using the CF encoding, find the corresponding NSStringEncoding
    val nsEncoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding)

    // (4) Encode the Kotlin String using the NS Encoding. The resulting NSData
    //     lives in the ARC-enabled iOS runtime and since it does not escape the current
    //     scope, will be collected when scope ends.
    val encodedData: NSData =
        (text as NSString).dataUsingEncoding(nsEncoding, allowLossyConversion = true)
            ?: throw RuntimeException("encoder failed")
    val encodedBytes = encodedData.bytes ?: throw RuntimeException("encoder failed")

    // (5) Create a Kotlin-land ByteArray and copy over the encoded bytes
    // from the ObjC-land NSData.
    //
    // <https://github.com/JetBrains/kotlin-native/issues/3172>
    return ByteArray(encodedData.length.toInt()).apply {
      usePinned { pinnedByteArray ->
        memcpy(pinnedByteArray.addressOf(0), encodedBytes, encodedData.length)
      }
    }
  } finally {
    // Don't forget to free the unmanaged CF pointer! 
    CFRelease(cfCharsetName)
  }
}

Is there a way to automatically catch any of swift/objc exceptions/errors in

try ... catch ...

in Kotlin while calling

interface

method implemented in swift/objc? I saw relatively new

ForeignException

but afaik it only works for cinteroped libraries with special flag

Hey does anyone know how a

sealed interface

will compile to objective-c? Is it the same as how it compiles as just an

interface

for Java? Wondering if it would have been better for

kotlin.Result

to have been a

sealed interface

with an underlying

private value class

such that it could compile to other platforms...

hi guys i want to find kotlin source code to learn how they implemented.For example i want to learn how to string method implemented but i could not find it how can i find kotlin source code?

Hello, I did quite a bit of Google searching to try to find out what the limitations of Kotlin native might be. I know that using Java libraries is a no go, but what about for stdlib functions in kotlin which delegate to Java, such as the Random module or this module https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.concurrent/java.util.-timer/schedule.html I see from the colored tabs on the website that it is appears to only have JVM support, but is there another option to use similar functionality as timer.schedule while using kotlin native?

How difficult is a kotlin native executable to backwards engineer?

How does the kotlin.native.internal.GC class work when I’m on the new memory model? The comments indicate that it controls the old ARC-like GC. I’m getting memory leaks in my app right now while interoping with a C library, so I’m mixing Kotlin’s GC with manual malloc/free. I’d like to be able to force a GC periodically so I can see the memory impact of my malloc/free objects. Edit: Adding GC.start() before seemed to force a GC. I now see a sharp drop in memory usage immediately.

How can I access the swift

JsonEncoder

and

JsonDecoder

in Kotlin native? I noticed a JsonDecoder in Mapkit but can't see the Encoder in the same package.

Is it possible to obfuscate the method calls within a production application? I’m noticing I can still look at all the method calls via

Strings <exe> | grep -i <name of module>

How can you use macros in Kotlin?

How do you create CPointer<UByteVarOf<UByte>>? I simple want to pass the value 0

Is there a way to add additional

external expect fun

definitions to a pre-defined ObjC interop? I'm using an ObjC cocoapods library and need to call a function that's not part of its public API for testing. I know the function signature from its source code. Basically, I just need a way to ObjC "message" the function in Kotlin. Or something akin to Java reflection to access it.

What’s the correct way to transform a

NSNumber

to

kotlin.Number

? Is it just

myNsNumber as Number

?

I have several frameworks in my iOS project to split a code base. Shared code is added by cocoapods to each of them As result I get a crash with a lot of this messages:

Class SharedXXX is implemented in both YYY and ZZZ. One of the two will be used. Which one is undefined.

Has anybody solved this problem ?

We’re on the new memory model, and it’s kinda annoying to suppress IDE warnings relating to the old memory model on a one-by-one basis Is there a way to globally suppress old-memory-model-related warnings like

VARIABLE_IN_SINGLETON_WITHOUT_THREAD_LOCAL

?

Is it possible to somehow access XCTestExpectation in *iosTest*s? Or is there another mechanism for testing async code that calls back on the main thread? iOS tests execute on the main thread, which causes callbacks to deadlock with the test code waiting on it.

I'm trying to make this project compile https://github.com/Ribesg/kmp-reproducer It's very simple (like 9 files total), juste a Kotlin/Native iOS project with a pod dependency. It's trying to compile the dependency for an unsupported architecture, armv7. How can I fix it? It worked with Kotlin 1.6.21 but it required cocoapods-generate, which I have a hard time installing on my new Mac so I'd rather move on from it. I made an issue on Youtrack https://youtrack.jetbrains.com/issue/KT-53127/Cocoapods-dependency-is-built-for-unsupported-architecture

Hi guys, what’s the correct way to have KN use a different clang version than that in

.konan/dependencies/apple-llvm-20200714-macos-aarch64-essentials

? I’m thinking I might override the relevant property in

konan.properties

, but I’m not sure if it’s the right approach. Is anyone doing this?

Hi folks! Maybe someone can help me. I try to building lib through cinterop and there are complex numbers. On macosX64, macosArm64, mingwX64 everything is well, but on linuxX64 I get follow exception:

16:22:47   Exception in thread "main" org.jetbrains.kotlin.konan.KonanExternalToolFailure: The /mnt/agent/system/.persistent_cache/konan/dependencies/llvm-11.1.0-linux-x64-essentials/bin/clang++ command returned non-zero exit code: 1.
16:22:47   output:
16:22:47   /mnt/agent/work/40296c97b9f61601/multik-native/multik_jni/src/main/cpp/mk_linalg.cpp:22:27: error: use of undeclared identifier 'creal'
16:22:47     return mk_complex_float{openblas_complex_float_real(ret), openblas_complex_float_imag(ret)};
16:22:47                             ^
16:22:47   /mnt/agent/work/40296c97b9f61601/multik-native/build/cmake-build/openblas-install/include/openblas_config.h:128:55: note: expanded from macro 'openblas_complex_float_real'
16:22:47     #define openblas_complex_float_real(z)             (creal(z))

Hey, I want to write the C parts of JNI with Kotlin Native. The JNINativeInterface has the following function to get the string in C: https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/functions.html#GetStringUTFChars This function is mapped as property in Kotlin:

var GetStringUTFChars: kotlinx.cinterop.CPointer<kotlinx.cinterop.CFunction<

in

JNINativeInterface

. But getting this "function" fails and I don't know why. I don't invoke the function yet.

Are Kotlin functional interfaces not supported as Swift closures or ObjC blocks? Is there a technical reason the compiler couldn't generate a compatible API that accepts the equivalent of a Kotlin lambda?

Would it be a better practice to define these interfaces as

typealias InterfaceName = (param: ParamType) -> ReturnType

?

Is there way to avoid initialisation crash?

abstract class A {
	
	init {
		foo()
	}

	abstract fun foo()
}

class B : A {
	val b = /* init b */

	override fun foo() {
		b.something() // crash
	}
}

The super class call

foo()

on init so, the property

b

is not yet initialised

Is there any GTK K/N project that's actively being worked at? I'm looking to contribute rather than spin up my own, but the ones I've found all seem quite abandoned.

Where is Kotlin 1.7.20 coming from? It's not specified anywhere in my build, I'm trying to use 1.7.0:

* Source files: 
 * Compiler version info: Konan: 1.7.0 / Kotlin: 1.7.20
 * Output kind: FRAMEWORK

Can I have one abstract fun with multiple parameters/constructor without asking me to override two funs in the inherited class?, like so:

abstract class A {
   abstract foo(param1: Any): Any
   abstract foo(param1: Any, param2, Any): Any
}

class B: A {
   //ask me to override one fun at lease and make the other fun optional
   override foo(param1: Any): Any {
     ......
   }
}

I'll always inject the

foo()

fun with all parameters, but I don't need them in the inherited class in most cases

Hi all. With K\N this:

var onStateChanged: ((from: State, to: State) -> Unit)?

translated to:

@property void (^ _Nullable onStateChanged)(State *, State *) __attribute__((swift_name("onStateChanged")));

which makes this function signature problematic to read on iOS. Are there any way to pass/enforce argument name on k\n? PS. I mean that argument names

from

and

to

are ignored during kotlin to swift translation.

I'm trying to debug why AudioQueueNewOutput is returning an OSStatus with a value of -50. From what I can tell, the -50 indicates a kAudio_ParamError. I've verified that the AudioStreamBasicDescription values are the same as some existing code written in Swift that works fine. Is it possible that the iOS doesn't like the other param pointers? They are typed, so I was thinking that it wouldn't compile if there was a problem with them. Any suggestions on how to continue debugging?