Question about platform.windows.* . Is there an official doc where we can see which functions are supposed to work? Case in point:

platform.windows.UuidCreate(...)

This shows up in auto-complete. And IntelliJ doesn't complain. But the compiler ends up crashing. Also, auto-complete finds some functions which do work, like :

val tempPath = GetTempPath?.invoke(nBufferLength, buffer)

.. I'm a bit lost as to what I can expect to work? What's a good place to find a correct definition of what works?

can Kotlin Native access swift classes and understand them somehow?

Is there a way to set

linkerOpts

either in gradle config or

*.def

file to be output of

pkg-config --libs <LIB>

?

I have a problem with

val

in

companion object

having incorrect value on iOS, anyone saw anything about that? For example I have this in a subclass of

UICollectionViewCell

(hence the object superclass):

companion object : UICollectionViewCellMeta() {
        const val HEIGHT = 100.0
    }

But when I print the value of

HEIGHT

anywhere it has a nonsense value, maybe returning a pointer or reading random memory, it returns something like 6e-310. It also does not return the same value every time its read from different instances of the subclass of

UICollectionViewCell

. Wtf? Note: Removing

const

doesn’t change anything. No problem if the

val

is global, local to the class or a getter (

val HEIGHT: Double get() = 100.0

)

Does anyone know why when I build K/N GTK3 app on windows, the normal execution of .exe opens a terminal window as well?

Hello, i’m trying to call addTarget on an UITextField but it crash at runtime. Kotlin code

init {
        uiView.searchTextField.addTarget(this, platform.darwin.sel_registerName("searchTextChanged"), UIControlEventEditingChanged)
    }

    @ObjCAction
    private fun searchTextChanged() {
        // some code 
    }

iOS Crash

2020-01-08 15:34:46.891004+0100 Production[69085:8719071] -[kobjcc0 searchTextChanged]: unrecognized selector sent to instance 0x6000036b1620
2020-01-08 15:34:46.897007+0100 Production[69085:8719071] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[kobjcc0 searchTextChanged]: unrecognized selector sent to instance 0x6000036b1620'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff23c7127e __exceptionPreprocess + 350
	1   libobjc.A.dylib                     0x00007fff513fbb20 objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff23c91fd4 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
	3   CoreFoundation                      0x00007fff23c75c4c ___forwarding___ + 1436
	4   CoreFoundation                      0x00007fff23c77f78 _CF_forwarding_prep_0 + 120
	5   UIKitCore                           0x00007fff48093fff -[UIApplication sendAction:to:from:forEvent:] + 83
	6   UIKitCore                           0x00007fff47a6c00e -[UIControl sendAction:to:forEvent:] + 223
	7   UIKitCore                           0x00007fff47a6c358 -[UIControl _sendActionsForEvents:withEvent:] + 398
	8   UIKitCore                           0x00007fff4839655f -[UITextField fieldEditorDidChange:] + 202
	9   UIKitCore                           0x00007fff4837b53a -[UIFieldEditor textInputDidChange:] + 61
	10  UIKitCore                           0x00007fff483a6d45 -[UITextInputController _sendDelegateChangeNotificationsForText:selection:] + 104
	11  UIKitCore                           0x00007fff483a9628 -[UITextInputController _insertText:fromKeyboard:] + 765
	12  UIKitCore                           0x00007fff483aa07f -[UITextInputController insertText:] + 336
	13  UIKitCore                           0x00007fff4837ec97 -[UIFieldEditor insertFilteredText:] + 838
	14  UIKitCore                           0x00007fff4839c5e3 -[UITextField insertFilteredText:] + 93
	15  UIKitCore                           0x00007fff47ea906b -[UIKeyboardImpl insertText:] + 147
	16  UIKitCore                           0x00007fff47ea3863 -[UIKeyboardImpl _performKeyboardOutput:shouldCheckDelegate:] + 1059
	17  UIKitCore                           0x00007fff47ea24bd __55-[UIKeyboardImpl handleKeyboardInput:executionContext:]_block_invoke_2 + 372
	18  UIKitCore                           0x00007fff47ed1ab1 -[UIKeyboardTaskEntry execute:] + 147
	19  UIKitCore                           0x00007fff47ed05c7 -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 310
	20  Foundation                          0x00007fff25781c30 __NSThreadPerformPerform + 259
	21  CoreFoundation                      0x00007fff23bd4471 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	22  CoreFoundation                      0x00007fff23bd439c __CFRunLoopDoSource0 + 76
	23  CoreFoundation                      0x00007fff23bd3b74 __CFRunLoopDoSources0 + 180
	24  CoreFoundation                      0x00007fff23bce87f __CFRunLoopRun + 1263
	25  CoreFoundation                      0x00007fff23bce066 CFRunLoopRunSpecific + 438
	26  GraphicsServices                    0x00007fff384c0bb0 GSEventRunModal + 65
	27  UIKitCore                           0x00007fff48092d4d UIApplicationMain + 1621
	28  Production                          0x000000010c1b1359 platform_UIKit_UIApplicationMain_wrapper64 + 89
	29  Production                          0x000000010c10a7cb kfun:main(kotlin.Array<kotlin.String>) + 1371
	30  Production                          0x000000010c10ab1c Konan_start + 156
	31  Production                          0x000000010c17249f Init_and_run_start + 111
	32  libdyld.dylib                       0x00007fff5227ec25 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

my code is inspired from KotlinFinder project ( https://github.com/JetBrains/KotlinFinder/blob/master/ios-app/src/iosMain/kotlin/Views/CollectWordView.kt ) Slack Conversation

I'm getting

ld.lld: error: unable to find library -lglib-2.0

when linking for linux.

-lglib-2.0

is one of the linkerOpts. Any suggestions on what's wrong?

From K/N CInterop guide on kotlin webpage:

We use the staticCFunction{..} helper function from Kotlin/Native to wrap a Kotlin lambda function into a C function pointer. It only allows having unbound and non-capturing lambda functions.

Could someone elaborate on what it means by

unbound and non-capturing lambda functions

. Does it mean that for instance if you want to register callbacks from c they cannot be in a kotlin class, but rather only top-level function?

Will there be a separate Kotlin Native survey for non mobile developers (aka all the other Kotliners using Kotlin Native, which is a very LARGE group)? According to the Kotlin 2019 survey ( https://www.jetbrains.com/lp/devecosystem-2019/kotlin/ ) by JB with the Which platforms do you target? question (in the Kotlin Native section), the top target is Linux at 74% (large), Android at 48%, MacOS at 47%, and Windows at 45%. The iOS answer is significantly smaller at 28% (not very large).

How to export a “static method” in kotlin to a “class method” in objective-c? I have a object class like this in kotlin:

object LogUtil {

  fun log(message: String) {
    
  }
}

but export to ios framework, the class defined like this:

*__attribute__*((objc_subclassing_restricted))

*__attribute__*((swift_name("LogUtil")))

*@interface* CommonLogUtil : KotlinBase

+ (

*instancetype*)alloc *__attribute__*((unavailable));

+ (

*instancetype*)allocWithZone:(*struct* _NSZone *)zone *__attribute__*((unavailable));

+ (

*instancetype*)logUtil *__attribute__*((swift_name("init()")));

- (

*void*)logMessage:(NSString *)message *__attribute__*((swift_name("log(message:)")));

*@end*;

As code shows that “logMessage” method is not a “class method”, the expected result maybe like this:

+ (*void*)logMessage:(NSString *)message *__attribute__*((swift_name("log(message:)")));

Why it crash with this

dispatch("Hello") {
        println("Printing $it from Thread Started \n")
    }

and not with this ?

dispatch("Hello") {
        println(it)
        println("Printing from Thread Started \n")
    }

Code:

fun <P, T> dispatch(param: P, block: (P) -> T) {
    val ref = StableRef.create(param to block)
    pthread_create(nativeHeap.alloc<pthread_tVar>().ptr, null, staticCFunction { data: COpaquePointer? ->
        data?.asStableRef<Pair<P, (P) -> T>>()?.get()?.let { it.second.invoke(it.first.freeze()) }
        NULL
    }.reinterpret(), ref.asCPointer())
    ref.dispose()
}

Has anyone encountered this error when linking with gradle plugin?

Exception in thread "main" org.jetbrains.kotlin.konan.KonanExternalToolFailure:             The /home/mpetuska/.konan/dependencies/clang-llvm-8.0.0-linux-x86-64/bin/clang command returned non-zero exit code: 1.
            output: clang-8: error: no such file or directory: '
'

I'm on manjaro linux

Has anyone used Linux target with glibc 2.12? I'm having trouble as it's looking for 2.14 and not finding it

I’ve made it to step 4 in this guide, but for some reason my Kotlin code is unable to recognise the

libcurl.*

import? Even though I have the libcurl.def in the correct nativeInterop sub folder under

src

?

Is there a way to integrate some .dll files or .exe files into a KN windows binary? Right now I have to include the libraries in the same folder.

are atomicfu classes mutable by any thread?

Kotlin WorkerPool Implementation Just sharing code so others can use https://redfox.js.org/worker-pool.html

(It is a library for building languages: I use it with ANTLR and the Java target, I would like to use it also with ANTLR and the C++ target)

How can i get something similar to

private val dispatcher= Executors.newSingleThreadExecutor().asCoroutineDispatcher()

on native?

How can i go around constant

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen

for any top-level object I declare?

Got a question about "

kotlinx.cinterop.staticCFunction

" when called as a callback from C . (Thread/SO link)

Does have dependencies have to compile with the same version as the Kotlin version in my project?

Here are most of developers. Asking one silly question. 😅 I need one thing to improve. I'm totally bad in variable naming. Is there any way to improve it ?

Is it possible to implement a cross-platform GUI using Kotlin/Native? In my case I want to draw some rectangles, nothing more. (at least on Linux on Android, maybe also Windows and iOS) https://cantina.co/kotlin-native-naughty-or-nice/ has "no true cross-platform Kotlin GUI. Without those capabilities, I had to make some compromises. I decided to replace all the UI code with a character-based user interface instead." But maybe it is outdated nowadays?

How can i create an object on worker thread and then reference it again on another worker execution? Trying to implement redux pattern on background worker...

Could anyone please provide an example of how to call a c-function that takes a va_list argument from Kotlin Native? e.g.

vsnprintf

Does anyone know what the following error means? I tried compiling my Kotlin code as a watchOS framework but I keep getting the following error when running from Xcode.

any guidance on how we should use @ThreadLocal with an object that should be closed?

oi, running into this error in my iOS tests https://github.com/JetBrains/kotlin-native/issues/3219

Hey folks. I am playing around with Kotlin Native and hit the wall very early on. Running

./gradlew build

produces a weired error (see stacktrace)