Came up with this

hm, running into another issue, it's failing to link on linux for some reason on circleci: https://circleci.com/gh/willowtreeapps/assertk/248 running it locally works fine, not sure what's different

Hi everyone, can anyone help me? If I throw exception in kotlin/native library. How can I handle exception in C code?

This message was deleted.

Hello, my iOS team at work plans to switch to Swift Package Manager, is K/N compatible with this? We built a Kotlin multiplatform project that outputs an obj-C . Framework so I don't know if Swift Package Manager is only for Swift code or also Obj-C. Does someone know or have experience with Swift Package Manager?

Anybody using Kotlin as a replacement for Obj-C/Swift? For example in MPP, where implementation for iOS platform would usually be written in Obj-C/Swift

Relocating the original post: Hey folks, does anyone know if there's a way to compile a multiplatform project via clang-cl or MSVC instead of MinGW? I'm trying to do some kotlin native development for Windows only, and I'd like to interop with https://github.com/microsoft/Detours which uses a few Microsoft extensions to C (such as

__try

for SEH) and a few MSVC preprocessor flags.

How in C handle nullable pointer from kotlin native? I generate sharable library and use in C code. I return from Kotlin String? , in C header I have const char*. And I get an exception when I call method.

What is the correct way to replicate the behavior of a

static void*

attribute in Kotlin? Specifically a static reference to a function pointer. Does

val foo = staticCFunction(::<FunName>)

do this correctly?

I have a CFunction that then takes a pointer to that pointer. So I actually need to do

&(PVOID&)foo

which is separately challenging me. PVOID is just an alias for void*. So I guess I need to figure out how to get the memory address of any particular CPointer (the actual pointer variable, not the pointed object).

Hi, I created a new project and started with the Kotlin Mobile Android/iOS | Gradle example. But some things are red in the build.gradle and I can not build it because of

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

My Kotlin Plugin Version is v1.3.40-release-IJ2019.1-1

I've set it up a KN project running on android and ios (building the framework from within the xcode) and it works pretty well except for testing. I'm trying to have a test folder for common, android e ios but when i run the common tests it gets the actual from the android env. If i create a kotlin native ios/android project from intelliJ itself the tests work but i can't make it generate new framework from within xcode, which i managed to do with the manual setup. In the thread is my build.gradle

Hello i'm trying to define what is the different kotlin native use case in mobile development and i need to know if it is correct if i say that "kotlin native can be used in 2 ways the first one by creating shared library (.aar and .framework) for a code reuse purpose and the second way is to use it inside a project but still need to create a library to use it in ios side" ?

Cannot pass through a reference to a Kotlin function as a parameter. There seems to be a C interop mismatch with incorrect mapping files being generated for the Paho MQTT Client library ( https://www.eclipse.org/paho/clients/c/ ).

need help, how can i make dynamic c function ? fun g_callback(func: (CPointer<GtkWidget>?)->Unit): GCallback? = staticCFunction { widget: CPointer<GtkWidget>? -> println("kavan") func(widget) }.reinterpret()

If anyone intrested in building Kotlin Gtk library please contribute here. https://github.com/kavanmevada/kotlin-native-gtk-linux

Pure swift libraries is supported by KN? I had to fallback to ObjC library with CocoaPods 😞

Unexpected behaviour found in K/N:

val r = AtomicReference(1000L)
val v = r.value
println(r.compareAndSet(v, 2000L))

The code above prints

false

. Line

val v = r.value

unboxes the value so

compareAndSet

is called with new instance of

Long

and fails. I am aware of

AtomicLong

, I'm trying to write some inline extensions for

AtomicReference

and they fail if type

T

is primitive.

Did anyone figure out how to use an expect/actual for

java.lang.String.format

and

NSString.create(format, args)

? The

NSString

requires you to use

*arrayOf(…)

for args. For example let’s say this is the expect function:

expect fun String.format(vararg args: Any?): String

How would you able to make an actual fun using

NSString.create

?

My gradle build have been failing with this error (on 1.3.40)

Execution failed for task ':client:linkDebugTestLinuxX64'.
> Process 'command '/opt/java/openjdk/bin/java'' finished with non-zero exit value 1

Does anyone have an idea what that mean? Debugging wasn't that helpful.

I’m trying to find a way to detect if a binary is debug or release, so I can disable/enable logging. I tried something like this:

val commonMain by sourceSets.getting
val iosMain by sourceSets.creating {
    dependsOn(commonMain)
    dependencies {
        // iOS dependencies
    }
}
val iosDebug by sourceSets.creating {
    dependsOn(iosMain)
}
val iosRelease by sourceSets.creating {
    dependsOn(iosMain)
}
targetFromPreset(iosTarget, "ios") {
    val debugCompilation = compilations.create("debug")
    val releaseCompilation = compilations.create("release")

    binaries {
        framework("common", listOf(DEBUG)) {
            compilation = debugCompilation
        }
        framework("common", listOf(RELEASE)) {
            compilation = releaseCompilation
        }
    }
}

I think this should work, I can use

expect

in iosMain and

actual

in iosDebug/iosRelease. However, the iosTest task I have throws an error it cannot find the

actual

implementation for the

expect

property. This is probably because the test uses iosMain instead of iosDebug. Is there a way to change that?

Does the

kotlin-platform-native

plugin lack any features that the

multiplatform

plugin has? I know the platform-native plugin is considered deprecated, but my team just tried to swap to the

multiplatform

plugin, and we found several blocker bugs with the

multiplatform

plugin that stops us from swapping.

Anything I need to be aware of if I use

-Xdisable-phases=Devirtualization

? Performance penalty?

Keep on getting a segmentation fault when running the Kotlin Native program, and wonder if the macro wrapper (in the def file) is correct:

# ...
---
static inline MQTTClient_connectOptions createMqttConnectionOptions() {
    MQTTClient_connectOptions options = MQTTClient_connectOptions_initializer;
    return options;
}

Hi, when building lately I get the following error. It’s probably something we wrote because a few commits before we managed to build the .Framework just fine. Any idea?

What are the key things to be aware of with threads in Kotlin Native when it comes to C interop? Have a situation where a segmentation fault occurs when a callback (on the 2nd thread) is invoked by a C API (on the 1st thread which is the main thread?).

The Kotlin Native mapping for the Paho MQTT Client library isn't aligned correctly. Take for example the MQTTClient_create function ( https://www.eclipse.org/paho/files/mqttdoc/MQTTClient/html/_m_q_t_t_client_8h.html#a9a0518d9ca924d12c1329dbe3de5f2b6 ) which takes four arguments. One of the arguments is handle which is a pointer to MQTTClient ( https://www.eclipse.org/paho/files/mqttdoc/MQTTClient/html/_m_q_t_t_client_8h.html#a7649e3913f9a216424d296f88a969c59 ). In the mapping the handle argument uses the CValuesRef<MQTTClientVar>? instead of CPointer<MQTTClient>?. Below is the MQTTClient_create function mapping:

public fun MQTTClient_create(handle: kotlinx.cinterop.CValuesRef<paho_mqtt.MQTTClientVar /* = kotlinx.cinterop.CPointerVarOf<paho_mqtt.MQTTClient /* = kotlinx.cinterop.CPointer<out kotlinx.cinterop.CPointed> */> */>?, @kotlinx.cinterop.internal.CCall.CString serverURI: kotlin.String?, @kotlinx.cinterop.internal.CCall.CString clientId: kotlin.String?, persistence_type: <http://kotlin.Int|kotlin.Int>, persistence_context: kotlinx.cinterop.CValuesRef<*>?): <http://kotlin.Int|kotlin.Int> { /* compiled code */ }

Is there a way to discover which character encoding is used? Some of the MQTT payloads have gibberish in them. Below is some sample output from the official Test Mosquitto server (a MQTT Broker), which is accessed from a Linux X64 PC:

Message arrived.
Topic Length: 0).
Topic: some/test/ships
Payload: {"lat":50.895,"lon":-1.391,"name":"ANGRY WASP","type":"sailing","typeno":36,"icon":"ship","iconColor":"lightblue","bearing":"300","speed":"0.0","destination":"","callsign":"MCMK9","layer":"AIS","time":"2019-07-04 02:16:34 UTC","ts":1562206594}

Message arrived.
Topic Length: 0).
Topic: /golot7/kitchen/center/lampstatus
Payload: 0

Message arrived.
Topic Length: 0).
Topic: analytics
Payload: {"name":"event.system.incoming.communication","date":1562206718325,"content":{"system.id":"08afb391512349019fc4462c69903138","communication.id":"45454545","message.id":"5b40f35036ad4a88afab6110b982a8d2","threadId":"18"}}2043����

Message arrived.
Topic Length: 0).
Topic: /merakimv/Q2EV-2QFS-YRYE/light
Payload: {"lux": 109.8}

Message arrived.
Topic Length: 0).
Topic: analytics
Payload: {"name":"event.system.incoming.communication","date":1562206718379,"content":{"system.id":"08afb391512349019fc4462c69903138","communication.id":"45454545","message.id":"77c19ab137e04c61b15f3cff2b816510","threadId":"7"}}":"20����A

Message arrived.
Topic Length: 0).
Topic: rpi/rpi
Payload: �?�3�A��s
                     |�

Hey, I am having an issue with the

@Throws

annotation. I have implemented it as described in this thread https://kotlinlang.slack.com/archives/C3SGXARS6/p1541595589233800. During

:linkDebugTestIos

I get an exception on a test class which is testing a method with the annotation.

java.lang.IllegalStateException: Arrays of class literals are not supported yet

Does anyone have any ideas about this? Any help would be greatly appreciated.

I am getting the following error at run-time when returning a response object from a network call after doing a JSON parse to my class:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[ReasonCompanion<0x10aea0210> init]: cannot init a class object.'

Any clues as to what to look for?