Hi @Artyom Degtyarev [JB], I want C++ code invoke a callback that is implemented in Kotlin, and that callback need to return a string, is that possible? Currently I declare the callback in C header like this:

typedef const char* (*PCClientOnPreferCodecs)(void*, const char*, const char*);

And my Kotlin code implementing it is:

private fun PCClientCallbackOnPreferCodecs(opaque: COpaquePointer?, peerUidPtr: CPointer<ByteVar>?, sdpPtr: CPointer<ByteVar>?): CPointer<ByteVar>? {
  initRuntimeIfNeeded()
  if (opaque == null) {
    return null
  }
  memScoped {
    return opaque.asStableRef<PeerConnectionClientCallback>().get().onPreferCodecs(peerUid, sdp).cstr.ptr
  }
}

I pass it into C++ with

staticCFunction(::PCClientCallbackOnPreferCodecs)

, and pass

opaque

with

StableRef.create(callback).asCPointer()

. It could be compiled and linked, but at runtime the string I get at C++ is scrambled code.

Hi, I hava another issue now with generics and obj-c. In kotlin I have a simple class with Int types:

data class MyTestDataClass(val ppp: Int, val ttt: List<Int>)

But in obj-c it looks like: CommonMyTestDataClass : KotlinBase - (instancetype)initWithPpp:(int32_t)ppp ttt:(NSArray<CommonInt *> *)ttt So different types: int32_t and CommonInt WTF?

has anyone added a cinterop (Obj-C framework) to a test executable?

Hi! How to do this

jvm {
        compilations.main.kotlinOptions { 
            jvmTarget = "1.8"
        }
    }

for android? it works for jvm, but on android target I get:

Could not get unknown property 'main' for KotlinJvmAndroidCompilation container of type org.gradle.api.internal.FactoryNamedDomainObjectContainer.

during gradle sync

is there any multiplatform logging library that will actually be able to print the original location of the code in the debugger? i tried kotlin-logging but all i get is

ConsoleOutputAppender.kt:6

what do you use for logging inside shared code ?

Hello, I split firebase dependencies into submodules in kmp project. auth, database, remoteconfig, storage are working fine, but the analytics module has something wrong. I’m using Carthage in cinterop, I checked the analytics dependency’s framework.

language = Objective-C
modules = FirebaseAnalytics
compilerOpts = -framework FIRAnalyticsConnector -framework FirebaseAnalytics -framework FirebaseCore -framework FirebaseCoreDiagnostics -framework FirebaseInstallations -framework FirebaseInstanceID -framework GoogleAppMeasurement -framework GoogleDataTransport -framework GoogleDataTransportCCTSupport -framework GoogleUtilities -framework nanopb
linkerOpts = -framework FIRAnalyticsConnector -framework FirebaseAnalytics -framework FirebaseCore -framework FirebaseCoreDiagnostics -framework FirebaseInstallations -framework FirebaseInstanceID -framework GoogleAppMeasurement -framework GoogleDataTransport -framework GoogleDataTransportCCTSupport -framework GoogleUtilities -framework nanopb

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_SKPaymentQueue", referenced from:
      objc-class-ref in GoogleAppMeasurement(APMAnalytics_8b8a060bbe8023e2a8dc40576f3452ac.o)
  "_OBJC_CLASS_$_SKProductsRequest", referenced from:
      objc-class-ref in GoogleAppMeasurement(APMProductsRequest_769d88c7ff80f19356bd57d9fa02e637.o)
....
....

I have no idea, what’s wrong. I did everything similiar as the the other modules (which are testes and working), but I can’t build this module. Actually the Studio can solve dependencies, I could use FIRAnalytics for iOS and FirebaseAnalytics for Android, but build run into error. Any idea? Can somebody add Analytics dependency to kmp project? Oh and I set firebase modules binary to 6.15.0, because 6.16.0 has something problem in every module 🙂

woot - got artifactory working together with maven-publish. turns out to be pretty simple once you figure out how it all comes together.

Anybody has experience with Ktor Websockets when implementing for Android/iOs?

I'm willing to create a HttpClient(CIO), but CIO is not found/accessible Although the package io.ktor.http.cio and CIOHeaders is well visible 😕

Is there something I can do to make

fun sectionForIndex(index: Int): Section?

not compile to

Int32

in my objective-c framework?

Hi guys, has anyone here got some experience with Ktor websockets client in a multiplatform project? Does it work properly? Last time I checked (a few months ago) the doc was not really in sync with the artifacts, and it failed at runtime, so I wondered if things had moved since then. Any multiplatform websocket client would do, I just didn’t find anything other than Ktor so far. I’m mostly interested in JVM + JS support, but all-platform support would be a big plus.

When using data class in iOS, it's fields are renamed to component1, component2 etc Is there a fix for that?

Hi , Need you folks valuable insights on how reliable to adopt to Multiplatform at this stage as its still in Experimental phase..

is it safe to go with KMP at this point of time keeping in mind that Apple Rejection criteria in focus?

I think I’ve seen this before but I don’t remember now. How can we avoid the creation of the

commonMain

and

commonTest

source sets?

Hi all, I’ve mostly got a multiplatform library working; sans a couple of issues when I attempt to add a few things: • In the android `actual`s, I can’t seem to access android packages/classes (i.e.

android.os.Build

) • When I add a second

jvm()

target (for the server), the library builds, but the android app is no longer able to resolve dependencies.

The main pain point of Kotlin multiplatform now for me is build libraries, like a data structure library that doesn't depend on any platform specific implementation. The current problem is publish the library because you need to compile for all platforms native platforms. I was checking the Jetbrains Kotlinx library and they use a gradle plugin called infra that does this work, but I think is an internal plugin, anyone has an idea if this infra plugin will be shared to the community or any other current alternative to do it?

Did anyone manage to link their MPP library published to bintray to jcenter? I've been banging my head at this for weeks now, and from the latest response from bintray support it seems impossible:

1.) JCenter hosts open source applications using the Maven naming convention which has 3 components. For example, a valid allocated path might be: org/apache/maven

2.) You can only have one JCenter path assigned to one bintray package. Since the above requires 3 components your path options are the following: 

/lt/petuska/kvdom-dsl
/lt/petuska/kvdom-dsl-js
/lt/petuska/kvdom-dsl-metadata
/lt/petuska/kvdom-dsl-wasm32

Do I get this right and that essentially means there's no way to publish MPP libraries with gradle metadata to any mainstream maven repo?

Hey I haven't used Kotlin MPP since they did their major redesign of the project structure and I can't seem to figure it out. I just want to add a Kotlin-only MPP module to my Android app and failing horribly. Heres the

build.gradle.kts

file for the new module

plugins {
    kotlin("multiplatform")
}

kotlin {
    targets {
        targetFromPreset(presets.getByName("jvm"), "android")
    }
    sourceSets {
        commonMain {
            dependencies {
                implementation("org.jetbrains.kotlin:kotlin-stdlib-common:1.3.61")
            }
        }
        getByName("androidMain") {
            dependencies {
                implementation("org.jetbrains.kotlin:kotlin-stdlib:1.3.61")
            }
        }
    }
}

Everything builds fine, but my Android module can't see the kotlin MPP one

Hi, I am having troubles with getting Parcelize/Parcelable onto my MPP. My build gradle has

kotlin {
    jvm {
        apply plugin: 'kotlin-android-extensions'

        ...

        androidExtensions {
            experimental = true
        }
    }
}

Can someone help me?

Hi. I'm trying to add genercis support to iOS project. My build.gradle.kts is:

targets {
        final def iOSTarget = System.getenv('SDK_NAME')?.startsWith("iphoneos") \
                              ? presets.iosArm64 : presets.iosX64

        fromPreset(iOSTarget, 'ios') {
            binaries {
                framework('multiplatform-code') {
                    freeCompilerArgs.add("-Xobjc-generics")
                }
            }
        }

        fromPreset(presets.jvm, 'android')
    }

And I'm getting this error:

Build file '/..../multiplatform-code/build.gradle' line: 40

* What went wrong:
A problem occurred evaluating root project 'multiplatform-code'.
> Operation is not supported for read-only collection

And line 40 is:

freeCompilerArgs.add("-Xobjc-generics")

I dont understand the source of the problem. What exactly "Operation is not supported for read-only collection" is mean?

does anyone have an example repo(s) where they have setup publication for some android/iOS library modules, along w/ an umbrella framework for iOS that consumes the artifacts from the library modules?

As I'm dogfooding the next release of #splitties, I noticed the source jars are empty for some modules. It seems all modules that have common code have their sources properly put in the jar files, but all the modules that have only Android sources have no source files (only MANIFEST.MF). Did anyone experience something similar when publishing a #multiplatform library? I'm wondering what can be the cause of this issue. Maybe I found a bug?

hmmm, moved a dependency from a compile-inline project to pulling a klib from artifactory, and now its APIs are no longer being exported correctly

Having an issue with the cocoapods plugin. • Have included the pod in build.gradle

cocoapods { }

block • Generate podspec with Gradle task •

pod install

in the ios project folder successfully • Try to build from Xcode but get the following error:

> Task :someapp:cinteropSomeModuleIos

`Showing All Messages
Exception in thread "main" java.lang.Error: /var/folders/nv/hdlrvk9j2g77bsvj_npsm46r0000gn/T/tmp8525659560237793549.m:1:9: fatal error: module 'SomeModule' not found`

I checked FRAMEWORK_SEARCH_PATHS and it includes the path to SomeModule.framework Any ideas?

hey all, what is best tutorial to start multiplatform? I want to implement UseCase, Repository, DataSource and Network layer in multiplatform. Is it possible? if yes then can you please share some good tutorial to start. Thanks

Hey folks, is this expected that importing

import kotlin.test.Test

is highlighted red in the IDE when the test is located in the

commontTest

source set? Gradle build doesn’t fail, seems like an IDE issue.

Is MOKO resources https://github.com/icerockdev/moko-resources the only MP string resource solution?

This is a newbie question, but I'm finding some confusing and potentially out-of-date info about this: Can you separate out your source-sets into separate gradle modules while using KMP?

My use-case: I already have a modular Android app and I want to add iOS. Here's the structure

MyApp
  - app
  - feature1_domain
  - feature1_presentation
  - feature2_domain
  - feature2_presentation
  - and so on

All the _`domain` modules serve the purpose of

common

in KMP (they have platform-agnostic code already).

app

, and all the

_presentation

modules have Android-specific code. Wondering what's the best approach to add iOS here. From what I understand, the goal is to generate a single

.framework

from the common code for use in iOS. I did not find any examples of this