is there any way to use delay in an iOS project? https://github.com/Kotlin/kotlinx.coroutines/issues/920

Are there any examples of C or Obj-C compiled inside / alongside an mpp project?

I’m building a desktop app (windows mainly) that will communicate to hardware via RS-232 and RS-485. Is that possible? Any suggestions on libraries?

Why there is no

NSDate(timeIntervalSince1970:)

in kotlin? 😞

Is there any chance that I could get more information other than

runtime assert: Memory leaks found

? Can't find where the leak is from.

Is there an issue for generating multiple native functions when a kotlin function has default parameters? I can’t find it if there is one, and there should be one if there is none, because I’ve got a constructor with 5 optional parameters and that’s a lot of

constructor

cases to define by hand

When you call

.freeze()

on an object, somewhere along the line it calls

FreezeSubgraph

internally. What is it that determines what is part of an object's subgraph that also gets frozen as a part of that object's freeze operation?

Also, is there a debug tool that would let you tell what things you might accidentally be freezing, in a more complex project?

hi does kotlin native work compared to normal kotlin, do you still have a GC?

or do you need to deal with CPointer types and malloc/free bindings

tbh, i've avoided this by just defining file-level functions that call into the companion, which become exposed to Swift/Obj-C as FileKt.someClassMethod

thats my usual goto also, however I need a companion in this case because the function is creating an instance of a class that has a private constructor

is there any good example or documentation for how to use 3rd party library (particularly iOS

framework

provided by some vendor) in Kotlin Native?

when compiling the following K/N code:

fun foo(bar: IntArray) {}

to a macOsX dynamic library, I “get” a compiled library with a generated header where kotlin IntArray type is mapped to

libtest_kref_kotlin_IntArray

, where

test

is the name of my library. There seems to be no good way of constructing this object though, or at least it’s not defined in this header. Is there a way of consuming this library in a C program and somehow providing an object of that type?

Hey iOS people! Daniel Eke (didn't find him here unfortunately) posted nice Gradle snippet that allows one to build fat framework using

lipo

with single Gradle task (configuring and running two Gradle builds under the hood). https://github.com/JetBrains/kotlin-native/issues/2718#issuecomment-467838456 This looks to me like a good candidate for a bit of generalization, so maybe someone will find it useful :)

What happened to the Kotlin/native plugin for app code? It doesn't work with the latest version of app code.

I’m using the most recent multiplatform plugin and when i run

./gradlew build

it recompiles the project even when it successfully compiled previously and there has been no changes. Is this a bug? Or is there some misconfiguration in my project?

I tried making a

data class

backed by an iOS foundation object, and kotlin didn't complain. Is this because K/N has built in facilities for generating equals and hashCode that call the NSObject equivalents?

hey guys, I am trying to build a framework from a cinterops that imports another framweork: NearbyMessages from Google So I install the NearbyMessages framework via cocoapods. NO issues. I defined my cinterops bloc and I can use the generated bindings in Kotlin classes. I can also publish locally my multiplatform library. But if I decide to export my ios target as a framework, I receive this error:

ld: symbol(s) not found for architecture arm64

this only appears because I added

staticLibraries

and a

libraryPaths

in my def file since I noticed that the google framework contains a native library

.a

and other frameworks as part of the its internal dependency. I have tried multiple combination of using

linkerOpts

with

-L

or

-F

pointing at the folder where the framework has been imported but nothing works. I have not been able to find a clear explanation as to how to create correct cinterops with ios framework that contains a static library and multiple indirect dependencies since I suspect that the impossibility to export this as ios framework is related to my wrong configuration of the cinterops. Thanks in advance Def File:

depends = Foundation
language = Objective-C
headers = GNSMessages.h
staticLibraries = NearbyMessages/Libraries/libGNSMessages.a
libraryPaths = /Users/cyrille.quemin/Documents/git/multiplatform-p2p/p2p-common/src/iosMain/dependencies/Pods

Cinterops:

binaries {
                framework("p2p_common") {
                    linkerOpts "-L${podsDir}/NearbyMessages/Libraries"
                }
            }
            compilations.main.cinterops {
                NearbyMessage {
                    defFile "src/iOSMain/c_interop/NearbyMessages.def"
                    includeDirs "${podsDir}/Headers/Public/NearbyMessages"
                    linkerOpts "-F${podsDir}/NearbyMessages/Libraries/"
              }
         }

Hi all! From Kotlin Native I’m trying to access a swift extension:

SWIFT CODE:
let originalString = "test/test"
let escapedString = originalString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)
print(escapedString!)

I found that this function is defined as an extension in a class called

StringProtocol

extension StringProtocol where Self.Index == String.Index {

Any idea how can I get access to this function from Kotlin Native? Thanks!

Why does

SystemTimeToFileTime

return 0, I messed up with types? For the structure, should I do

alloc

or` allocArray`?

val systemTime = alloc<_SYSTEMTIME>()
            systemTime.wDay=1u
            systemTime.wHour=11u
            systemTime.wMinute=11u
            systemTime.wSecond=11u
            systemTime.wMonth=11u
            systemTime.wYear=11u
        val fileTime = alloc<_FILETIME>()

        println(SystemTimeToFileTime(systemTime.ptr, fileTime.ptr))

Kotlin team is pleased to announce 1.3.30-EAP (see https://discuss.kotlinlang.org/t/kotlin-1-3-30-early-access-preview/11780), and following changes were made in Kotlin/Native:

* Exception backtraces in debug mode on macOS and iOS targets contains symbolic information
  * Support for 32-bit Windows targets (target mingw_x86)
  * Support for cross-compilation to Linux (x86-64 and arm32) from macOS and Windows hosts
  * Static Apple frameworks can be produced
  * Support Gradle 5.1
  * Fix alignment-related issues on ARM32 and MIPS platforms
  * Write unhandled exceptions stacktrace on device to iOS crash log
  * Fix undefined behavior in some arithmetic operations
  * Interop:
    * Get rid of libffi dependency
    * Support returning struct from C callbacks
    * Support passing Kotlin strings to C interop functions accepting UTF-32 arguments
    * Fix bool conversion
    * Support variable length arrays
    * Provide Kotlin access to C compiler intrinsics via platform.builtins package
    * Support clang modules
  * IDE
    * Kotlin/Native plugin is supported in CLion 2018.3 and AppCode/CLion 2019.1
    * Basic highlighting support for .def files
    * Navigation to source files from exception backtrace

Hey, I’m creating a framework from a MPP project with ktor as dependency, but the built

.h

doesn’t even seem to compile

How can pass a linker option to points at non Apple framework. I tried in my def file something like

linkerOpts = -framework AVFoundation -framework full/path/to/my/Framework

and also

linkerOpts = -framework AVFoundation -F path/to/my/framework/folder

-framework MyFramework` but it does not work. I keep on receiving this type of error:

ld: framework not found MyFramework

Damn, Kotlin extensions aren’t compiled into Swift extensions?

How do I define a lambda parameter in Kotlin Native that returns Objc/Swift’s

Void

?

I have now built a framework from a MPP project that in importing 2 framework via cinterops. However when I tried to import it into XCode the header seems to be generated with reserved words:

@property (readonly) Passport_reader_commonMapper *default;

or

@property (readonly) double double;

which prevent the frameword to be built in my iOS app. Any idea on a workaround?

Hey there I have a kotlin MPP (android and ios) and I have

ios32

and

ios64

presets. And some methods thatI use have a different signatures in 32 where it uses

Int

versus 64 where it uses

Long

. Those method are ios specific only. If I declare the same method twice (in 32 and 64 source set) then obviously I get a multiple definition error. Is there a way to deal with this where I dont need to have `expected`/`actual` because android would have no need for it and therefore 'fake' implementation?

Hey there I have a kotlin MPP (android and ios) and I have

ios32

and

ios64

presets. The 32 preset defines a

cinterops

. Is there a way for the 64 to 'inherit` the preset definition or do I have to duplicate the

cinterops

bloc and the others into my 64 preset ? Ideally something like ?

fromPreset(presets.iosArm32, 'myIOS') {
  compilations.main.cinterops {
  [...]
}

fromPreset(presets.myIOS, 'iOS64'){
}