kotlinlang #kotlin-native

So I tried using the new Kotlin 1.3 RC plugin Mobile Shared Library project generator in IntellJ IDEA. It generates a nice looking project, but I do not see any commands to generate the iOS Framework. What might I be missing?

3 replies · 2 participants

Seri

10/11/2018, 2:49 AM

Does Kotlin Native have a UUID type?

2 replies · 2 participants

kenkyee

10/11/2018, 6:38 AM

First cross platform project for you? That's usually a comment from someone who's never done one 😉

🤣 4

:trollface: 4

2 replies · 2 participants

Leonid Popescu

10/12/2018, 6:47 AM

Did I miss something or now the global variables are not exported anymore to the iOS Framework? (I’m not saying global variables should be used)

3 replies · 3 participants

hmole

10/12/2018, 1:16 PM

Why is constructor for

NSLayoutConstraint

not available from generated Kotlin bindings? Anything I'm missing?

2 replies · 3 participants

schlan

10/13/2018, 10:51 AM

Hey y'all, I'm playing around with Kotlin Native and running into some troubles. My current idea is to write a shared network client for an android & ios app. The API utilizes websockets, I guess my first question is, is that even possible? Can I use Ktor's websocket client on both platforms? native and jvm? I haven't found any details about this online. Currently, I'm just trying to get set up and import the ktor client into my project. I created a multiplatform project with the IntelliJ IDEA 2018.03 EAP wizard. All I basically did was adding the Ktor dependency (like shown in the KotlinConf app) and creating an instance of

HttpClient

in the common source folder. Compiling the jar works but when building for iOS I run into this error:

./gradlew :kotlin-native-common:linkDebugFrameworkIos

....

> Task :kotlin-native-common:linkDebugFrameworkIos
kotlin-native-v2-common/src/commonMain/kotlin/com/sebchlan/chat/Chat.kt:3:8: error: unresolved reference: io
import io.ktor.client.HttpClient
       ^
kotlin-native-v2-common/src/commonMain/kotlin/com/sebchlan/chat/Chat.kt:8:15: error: unresolved reference: HttpClient
    val bla = HttpClient {
              ^

7 replies · 3 participants

schlan

10/13/2018, 10:52 AM

Is it maybe a version mismatch?

kotlin_version=1.3.0-rc-146
coroutines_version=0.30.2-eap13
ktor_version=1.0.0-alpha-1
serialization_version=0.8.1-rc13

9 replies · 2 participants

fabianterhorst

10/13/2018, 5:00 PM

is it already possible to use kotlin native 1.0? https://github.com/JetBrains/kotlin-native/releases/tag/v1.0

4 replies · 3 participants

marcinmoskala

10/14/2018, 8:55 AM

Anyone have any idea what is wrong with KotlinConf application after migration to mutliplatform Gradle plugin? It throws: Unknown Gradle platform NATIVE https://github.com/JetBrains/kotlinconf-app

3 replies · 3 participants

Quang Luong

10/14/2018, 2:02 PM

Does anyone know how to config cinterop for the new kotlin native plugin ?

1 reply · 1 participant

Matej Kormuth

10/14/2018, 4:04 PM

Hello, what is the IDE I can use for development of kotlin/native application with some code in C / C++? Should I use CLion or IntelliJ? Also what version?

6 replies · 3 participants

agrosner

10/14/2018, 11:31 PM

which IDE should I use for Kotlin Native, if im writing a kotlin library to be consumed by ios kotlin projects? AppCode, CLion, or Intellij Ultimate?

6 replies · 3 participants

jkbbwr

10/15/2018, 10:00 AM

(my goal is to end up with a single bitcode file for all of my program including any runtime functions)

6 replies · 4 participants

ralf

10/15/2018, 5:20 PM

We’re just getting started with Kotlin Native and Multiplatform. Is there a good sample where the Kotlin Native library is importing another iOS library? Our goal is then to export the Kotlin Native library, but not necessarily as a fat binary if that works

8 replies · 2 participants

Matej Kormuth

10/15/2018, 8:22 PM

Does anyone tried to use GLFW with kotlin native? Declarations like

typedef struct GLFWwindow GLFWwindow;

in GLFW are being mapped to

kotlinx.cinterop.CPointer<cnames.structs.GLFWwindow>?

and have "ERROR" texts in IDE next to them.

16 replies · 4 participants

Matej Kormuth

10/15/2018, 11:16 PM

How to use GLEW from Kotlin? Functions like

glCreateShader

are defined with preprocessor macro:

#define glCreateShader GLEW_GET_FUN(__glewCreateShader)

where macro is defined as

#define GLEW_GET_FUN(x) x

but in klib there is only

__glewCreateShader

variable

public var __glewCreateShader: glew.PFNGLCREATESHADERPROC? /* = kotlinx.cinterop.CPointer<kotlinx.cinterop.CFunction<(glew.GLenum /* = kotlin.UInt */) -> glew.GLuint /* = kotlin.UInt */>>? */ /* compiled code */

and not the function.

6 replies · 3 participants

David

10/16/2018, 8:32 AM

I have problems with a memory leak when sending objects from a kotlin framework to an objective c class. Basically, once the object has been sent to objective c it is never released. Have I done anything stupid or is this a bug? I will put the code in the thread, but the full project is available here: https://github.com/dtornqvist/LeakingProblem

23 replies · 3 participants

agrosner

10/16/2018, 3:08 PM

Syncing works fine. but when I go to build the Xcode project and run, when gradle run it gets this error

5 replies · 3 participants

Hamza

10/17/2018, 12:54 AM

Hi,is there any documentation on how the .def file works and what those paths really mean? I’ve been able to follow the kotlin-native github repo to get it working, but it would be better if i understand what’s actually going on

1 reply · 2 participants

hmole

10/17/2018, 9:05 AM

How do I map NSError to kotlin Exception and throw it? This says it's not implmemented yet. https://github.com/JetBrains/kotlin-native/blob/master/OBJC_INTEROP.md#errors-and-exceptions

1 reply · 2 participants

Quang Luong

10/17/2018, 10:27 AM

I am trying to make a Kotlin/Native wrapper for

lwan

web framework. But after cinterop and stuff, I always run into this issue ---- To compile normal app in C with lwan, this command would work clang runApp.c -o samplelwan -Wl,-whole-archive -I../src/lib ../build/src/lib/liblwan.a -Wl,-no-whole-archive -lz -lpthread -llua5.1 -lm

-.txt

27 replies · 3 participants

hmole

10/17/2018, 10:58 AM

Is it intended that using function reference on a frozen(

myObj::func

) object throws an error, but if you make a val out of it before freezing it works fine?

3 replies · 2 participants

yusuf3000

10/17/2018, 12:45 PM

What does

runtime assert: Unknown open method

mean in layman terms?

2 replies · 2 participants

hmole

10/17/2018, 2:01 PM

Is there a way to add entries to

Info.plist

for framework without doing it manually through updating the file after compilation?

6 replies · 5 participants

rafal.adasiewicz

10/17/2018, 3:18 PM

Hi, I am creating a simple multiplatform project (Android, iOS) and I have a problem with UI CoroutineDispatcher for iOS. As Roman Elizarov mentioned in this thread https://github.com/Kotlin/kotlinx.coroutines/issues/462#issuecomment-429233477 I’ve added https://github.com/JetBrains/kotlinconf-app/blob/master/konfios/konfswift/ui/UI.swift dispatcher to my iOS app, but for some reason compiler says that

Kotlinx_coroutines_core_nativeCoroutineDispatcher

is undeclared. Moreover, I’ve spotted that if I go with the second solution https://github.com/Kotlin/kotlinx.coroutines/issues/470#issuecomment-414635811 everything works fine and

Kotlinx_coroutines_core_nativeCoroutineDispatcher

is declared properly. Why does

Kotlinx_coroutines_core_nativeCoroutineDispatcher

type disappears in the first approach? I am using:

coroutines - '0.30.2-eap13'
kotlin_version = '1.3.0-rc-146'
Gradle version =  4.7

8 replies · 2 participants

spierce7

10/18/2018, 5:58 AM

I'm getting an Exception when trying to compile Kotlin/native, and the gradle stacktrace isn't very helpful:

No descriptor for type {[@kotlin.ParameterName] T & Any}?

7 replies · 4 participants

spierce7

10/18/2018, 1:13 PM

@olonho I'm doing some theory crafting here. If I were to store an

NSMutableArray

cast to a

List<>

in the following object, would this have any problems being frozen shared between threads safely in Kotlin/native?

48 replies · 4 participants

louiscad

10/18/2018, 3:19 PM

Hi, I'd like to write this Swift code in Kotlin/Native:

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 300, height: 21))
        label.center = CGPoint(x: 160, y: 285)
        label.textAlignment = .center
        label.font = label.font.withSize(25)
        label.text = CommonKt.createApplicationScreenMessage()
        view.addSubview(label)

Per the Obj-C interop doc, I should be able to write

val label = UILabel.create(frame: CGRect.create(x = 0, y = 0, width = 300, height = 21))

for the first line, but there's no

create(…)

function in the autocomplete when using IntelliJ CE 2018.3 EAP with Kotlin 1.3.0-rc-146… Can anyone give me a hint?

6 replies · 4 participants

Quang Luong

10/18/2018, 5:15 PM

I don't understand why the program just crashs with the segmentation fault (core dumped) but if I comment out line 18 (

set_response(res)

), it would work. It does nothing except passing the response pointer around.

-.kt

3 replies · 2 participants

nayanjyoti

10/18/2018, 7:27 PM

Hi guys, I’m a total newbie on kotlin native/multiplatform projects. I tried to create a multi-platform project in idea community edition using the new project template. it created a build.gradle file like this.

plugins {
    id 'kotlin-multiplatform' version '1.3.0-rc-146'
}

repositories {
    maven { url '<http://dl.bintray.com/kotlin/kotlin-eap>' }
    mavenCentral()
}
group 'com.example.sample'
version '0.0.1'

apply plugin: 'maven-publish'

kotlin {
    targets {
        fromPreset(presets.jvm, 'jvm')
        fromPreset(presets.js, 'js')
        // For ARM, preset should be changed to presets.iosArm32 or presets.iosArm64
        // For Linux, preset should be changed to e.g. presets.linuxX64
        // For MacOS, preset should be changed to e.g. presets.macosX64
        fromPreset(presets.macosX64, 'macos')
    }
    sourceSets {
        commonMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-common'
            }
        }
        commonTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test-common'
                implementation 'org.jetbrains.kotlin:kotlin-test-annotations-common'
            }
        }
        jvmMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
            }
        }
        jvmTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test'
                implementation 'org.jetbrains.kotlin:kotlin-test-junit'
            }
        }
        jsMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-js'
            }
        }
        jsTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test-js'
            }
        }
        macosMain {
            dependencies {
            }
        }
        macosTest {
        }
    }
}

in the macos main module i want to include the ncurses library. So I changed the part as

macosMain {
            dependencies {
             cinterop('ncurses') {
                    // something more
                }
            }
        }

I am getting error

Could not find method cinterop() for arguments [ncurses, build_1mx5jx84o9toi8bpdxyehixos$_run_closure2$_closure6$_closure13$_closure21$_closure22@836eb38] on object of type org.jetbrains.kotlin.gradle.plugin.mpp.DefaultKotlinDependencyHandler.

Also I’m a total newbie to c/cpp or native world, so i may be doing something really stupid. if anyone can help i would b really grateful.

6 replies · 2 participants

Title

nayanjyoti

10/18/2018, 7:27 PM

plugins {
    id 'kotlin-multiplatform' version '1.3.0-rc-146'
}

repositories {
    maven { url '<http://dl.bintray.com/kotlin/kotlin-eap>' }
    mavenCentral()
}
group 'com.example.sample'
version '0.0.1'

apply plugin: 'maven-publish'

kotlin {
    targets {
        fromPreset(presets.jvm, 'jvm')
        fromPreset(presets.js, 'js')
        // For ARM, preset should be changed to presets.iosArm32 or presets.iosArm64
        // For Linux, preset should be changed to e.g. presets.linuxX64
        // For MacOS, preset should be changed to e.g. presets.macosX64
        fromPreset(presets.macosX64, 'macos')
    }
    sourceSets {
        commonMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-common'
            }
        }
        commonTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test-common'
                implementation 'org.jetbrains.kotlin:kotlin-test-annotations-common'
            }
        }
        jvmMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8'
            }
        }
        jvmTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test'
                implementation 'org.jetbrains.kotlin:kotlin-test-junit'
            }
        }
        jsMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-js'
            }
        }
        jsTest {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-test-js'
            }
        }
        macosMain {
            dependencies {
            }
        }
        macosTest {
        }
    }
}

in the macos main module i want to include the ncurses library. So I changed the part as

macosMain {
            dependencies {
             cinterop('ncurses') {
                    // something more
                }
            }
        }

I am getting error

Could not find method cinterop() for arguments [ncurses, build_1mx5jx84o9toi8bpdxyehixos$_run_closure2$_closure6$_closure13$_closure21$_closure22@836eb38] on object of type org.jetbrains.kotlin.gradle.plugin.mpp.DefaultKotlinDependencyHandler.

Also I’m a total newbie to c/cpp or native world, so i may be doing something really stupid. if anyone can help i would b really grateful.

orangy

10/18/2018, 7:58 PM

It should look something like this:

fromPreset(presets.macosX64, 'sdl2macos') {
                compilations.main {
                    cinterops {
                        sdl {
                            defFile = file("sdl2/interop/sdl2.def")
                        }
                    }
                }
            }

nayanjyoti

10/18/2018, 8:34 PM

thanks @orangy. this worked. gradle build is working. the def file i have is

headers = /usr/local/opt/ncurses/include/ncurses.h
headerFilter = /usr/local/opt/ncurses/include/ncursesw/*
linkerOpts.osx = -L/usr/local/opt/ncurses/lib -lncurses

The paths are all okay. the file

/usr/local/opt/ncurses/include/ncurses.h

is the header file from the installation of homebrew on mac mojave. I used the command

cinterop -def src/macosMain/ncurses.def -compilerOpts -I/usr/local/opt/ncurses/include -o src/macosMain/lib/ncurses

to generate the binding to look into the functions. On executing, a kotlin file is created at the path

src/macosMain/lib/ncurses-build/kotlin/ncurses/ncurses.kt

. The content od the file is empty. (apart from the package import and @file statements).content is below

@file:kotlinx.cinterop.InteropStubs
@file:Suppress("UNUSED_VARIABLE", "UNUSED_EXPRESSION")
package ncurses

import kotlin.native.SymbolName
import kotlinx.cinterop.*

// NOTE THIS FILE IS AUTO-GENERATED

This doesn’t seem right. I’m not even sure if I’m doing the right thing here. 😞

orangy

10/18/2018, 8:37 PM

You don’t need to run

cinterop

manually, gradle task should handle it for you. Please check https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md for more information about

.def

files

Also it’s better to ask Kotlin/Native related questions in #kotlin-native channel

🤔 2

nayanjyoti

10/18/2018, 8:42 PM

@orangy: Yes, I understand that. I was trying the cinterop when I hadn’t seen ur reply. However the generated file was empty like above. On running the gradle build, the generated kotlin file is empty, which doesn’t seem right. Can u suggest what I might be doing wrong? We r in the #kotlin-native channel only. 🙈

This is the cinterop section in build.gradle

fromPreset(presets.macosX64, 'macos') {
            compilations.main {
                cinterops {
                    ncurses {
                        defFile = file('src/macosMain/ncurses.def')
                        includeDirs '/usr/local/opt/ncurses/include'
                    }
                }
            }
        }

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