So I'm trying to convert a NSData to NSString, in Obj-C I can do it like this

NSString *newStr = [NSString stringWithUTF8String:[data bytes]];

So i tried that in K/N like this

val newStr = NSString.stringWithUTF8String(data!!.bytes!!)

But I got this error message

Error:(21, 55) type mismatch: inferred type is COpaquePointer? /* = CPointer<out CPointed>? */ but CPointer<ByteVar /* = ByteVarOf<Byte> */>? was expected

So what've I missed here? Thanks. 🙂

Will KN love this code?

val name = this::class.qualifiedName

Just a little reflection

Hi, I was wondering if I could get some clarification on something that confused me in https://kotlinlang.org/docs/reference/native-overview.html

[Kotlin/Native] comprises a LLVM-based backend for the Kotlin compiler and a native implementation of the Kotlin runtime library

"backend" in this context does not mean an actual LLVM backend (which consumes IR to produce machine code). Instead it is backend for the Kotlin compiler itself. So

(Kotlin compiler + "backend") = LLVM frontend

. is this correct?

I’m trying to download K/N 0.7 via gradle, but I get an exception:

A problem occurred evaluating project ':platform-ios'.
> org/gradle/api/internal/FeaturePreviews

Is this something I’m doing wrong?

hey, I was wondering if there is a way to load a kotlin native library as a dynamic lib? or do I have to generate a dynamic C lib and load that? I basically just want to load & use a lib at runtime

It seems like the build fails before the run script can execute

is any sort of reflection planned for kotlin/native?

@channel myself and @svyatoslav.scherbina will be at Google IO in Moutain View this year, so feel free to come and chat with us (@abreslav and @Alexander Podkhalyuzin [JB] will be there as well)

In which

.gradle

file should be

apply plugin: 'kotlin'
apply plugin: 'konan'

konan.targets = [
    'ios_arm64', 'ios_x64'
]

konanArtifacts {
    framework('KotlinNativeFramework')
}

when build multimodule project?

Anyway to force the Kotlin Native plugin for Appcode to download 0.7.0 version of KN? Running the gradle script downloads the right version(0.7.0) but when I open a KN project in Appcode, it always download 0.6.2 if its not already downloaded.

it seems there is some bug relating init in companion objects. I have a anonymous class extending a class with a init companion object, it is not working (using a workaround now)

why access a property will trigger seg fault?

Is it recommended to write DSLs for C bindings or it can cause problems with low-level operations like pointers, memory management, etc? The GTK sample from KN repository, for example, uses functions like

gtk_window_set_title

and

gtk_button_new_with_label

which is not similar to how JVM code is written.

Errors when

apply plugin: 'konan'

version = 0.7

Caused by: java.lang.NoClassDefFoundError: org/gradle/api/internal/FeaturePreviews
	at org.jetbrains.kotlin.gradle.plugin.KonanPlugin.apply(KonanPlugin.kt:351)
	at org.jetbrains.kotlin.gradle.plugin.KonanPlugin.apply(KonanPlugin.kt:269)
	at org.gradle.api.internal.plugins.ImperativeOnlyPluginTarget.applyImperative(ImperativeOnlyPluginTarget.java:41)
	at org.gradle.api.internal.plugins.RuleBasedPluginTarget.applyImperative(RuleBasedPluginTarget.java:49)

What am i missing?

Having a problem. I have a project set up in IDEA (

common

, and

android

for android lib, and

ios

for ios framework), but when I open this project in AppCode, nothing shows in the

Project

panel… I assume it might be something to do with the

.idea

folder between IDEA and AppCode is different. So, in order to make the multiplatform works for iOS, I need to create the projects in AppCode from scratch?

what are the current thoughts on how [companion] objects will be represented in ObjC? I remember hearing some discussion that these interop APIs will probably change, but I'm curious what the candidates look like (if there are yet any)

In terms of iOS:

fun checkInt(value:Int): String = "number: $value"

It works. when you

print(checkInt(6))

at the swift side, it will print

number: 6

But this won’t work

fun <T> checkGeneric(value: T):String = when (value) {
          is String -> "string"
          is Int -> "number"
          is Boolean -> "boolean"
          else -> "Unknown"
  }

String

and

Boolean

type works fine, but

print(checkGeneric(6))

will output

Unknown

. So, the generic is partially supported?

class KotlinView1  {
}

class KotlinView2 : UIView {
   @OverrideInit constructor(coder: NSCoder) : super(coder)
}

@ExportObjCClass
class KotlinView3 : UIView {
   @OverrideInit constructor(coder: NSCoder) : super(coder)
}

After compiling this as a framework artifact, I see only

@class KotlinView1

in a header file. Is this use case not supported or am I doing something wrong?

I don’t know if this has been asked before, but how mature is the KN - Javascript interop on the WebAssembly front?

So, KN requires a gradle versoin > 4.6 now, but Android gradle plugin has a different idea, they need a version less than 4.6, causes trouble for a multiplatform project when building Android lib:

> Failed to apply plugin [id 'com.android.library']
   > Configuration on demand is not supported by the current version of the Android Gradle plugin since you are using Gradle version 4.6 or above. Suggestion: disable configuration on demand by setting org.gradle.configureondemand=false in your gradle.properties file or use a Gradle version less than 4.6.

Anyone has this issue? Even I set that to

false

, Android gradle plugin still gives the same error

In swift I have array with data: [Uint8]. In kotlin i have class that should process that data. What kotlin type i should use, that could hold this value? List<Byte> gives [NSNumber], but it will create new object. I wonder if i could avoid creating new objects.

Looks like the clion team made progress with gradle: https://blog.jetbrains.com/clion/2018/05/clion-starts-2018-2-eap-sanitizers-gradle-db-performance/#gradle_cpp_projects #hype!! 😄

When I'm trying to implement kotlin interface in swift my app crashes:

Unrecognized selector -[ios.IosApiRequestsMaker toKotlin:]
2018-05-19 05:15:48.277185+0500 ios[47861:1486398] Unrecognized selector -[ios.IosApiRequestsMaker toKotlin:]

Is there way to fix it?

The 0.7 changelog includes the item: “Use Gradle native dependency model, allowing to use .klib as Maven artifacts” Does this mean I can publish a klib to a repository like jitpack or bintray and consume it in another project? If so, how can I configure this via the gradle plugin?

I think at some point somebody shared a Gradle multiplatform sample repo including JVM and Native support but I can't find the GitHub repo again. Can somebody share the link again?

Also is it possible to build a WebAssembly app like html5Canvas with Gradle or is there some current blocking points ?

I need to make a method in my kotlin common code synchronised. What would be the best way to do this considering kotlin common doesn’t have this keyword? This method is being called from swift/kotlin. Should the methods that call into the kotlin common code be synchronised instead?

My second attempt to develop cross-platform desktop GUI applications: https://github.com/msink/kotlin-libui

Is there a way to tell the kotlin compiler where an existing (non-kotlin) iOS framework is at? I successfully got the c_interop tool to build iOS stubs but getting an Undefined Symbol error when I got to build. Also, I alredy embedded/linked the same framework into the Xcode project