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#kotlin-native
  • s

    Sander Saelmans

    06/24/2020, 8:31 AM
    Is there a way to make documentation available to a swift/objc framework? e.g:
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    /**
 * Some documentation
 *
 * blablabla
 */
object SomeObject : SomeObjectFacade() {
   ...
}
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  • r

    Ragyal

    06/25/2020, 8:08 PM
    Can anyone help me fix/clean up my build.gradle? I can run the app on the simulator, but as soon as I want to test it on my iPhone, the build fails and states that a target for ios_arm64 or ios_arm32 must be present. Probably many things can be simplified there or are no longer up-to-date. I have different parts from different guides or templates, but I don't know much about gradle.
    build.gradle
    r
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  • c

    CraftSpider

    06/26/2020, 3:22 AM
    I posted in #language-evolution and was told more Native team might see this here: I have interest in K/N reflection. If I were interested in doing work to add support for it, what would be involved in that? Is it currently blocked by technical limitations, is it not desired, or would this kind of thing be practical?
    s
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  • n

    napperley

    06/26/2020, 7:06 AM
    Trying to publish a message through AMQP via the rabbitmq-c library ( https://github.com/alanxz/rabbitmq-c ), and it looks as though the message isn't getting through (the Broker has dropped the message). The 
    amqp_basic_publish
    function is returning 0 (this means the message has been successfully transmitted to the Broker). Below is the code that is being used to publish the message:
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    private fun publishMessage(conn: amqp_connection_state_t?) = memScoped {
    val props = alloc<amqp_basic_properties_t>()
    with(props) {
        _flags = (AMQP_BASIC_CONTENT_TYPE_FLAG or AMQP_BASIC_DELIVERY_MODE_FLAG).toUInt()
        // TODO: Figure out how to set the AMQP content type.
//        content_type = amqp_cstring_bytes("text/plain")
        // Persistent delivery mode.
        delivery_mode = 2.toUByte()
    }
    println("Publishing message...")
    val publishRc = amqp_basic_publish(
        state = conn,
        channel = channel,
        exchange = amqp_cstring_bytes(EXCHANGE),
        routing_key = amqp_cstring_bytes(ROUTING_KEY),
        mandatory = 0,
        immediate = 0,
        properties = props.ptr,
        body = amqp_cstring_bytes(MSG_BODY)
    )
    if (publishRc != 0) println("Cannot publish message.")
    Unit
}
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  • p

    Paul Woitaschek

    06/26/2020, 12:25 PM
    I'm having trouble with some ide setup using kotlin native. I created a mpp project and now consumed that from a regular android library. When I click on a class definition, it shows me only a decompiled class file and not the actual sources. And it seems that all dependencies are not propagated correctly. I.e I'm using flow in my mpp library but when I want to use functions from the library that return a flow it says that kotlin.coroutines.flow is not in my classpath. (but it is and it compiles correctly) Any hints on how to fix these issues?
    k
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  • n

    napperley

    06/27/2020, 12:09 AM
    Having some issues which might be related to string encoding ( https://kotlinlang.slack.com/archives/C3SGXARS6/p1593155207088900 ) although i'm not entirely sure. What are the key things to check when dealing with a C library handling strings?
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  • u

    Ugi

    06/27/2020, 10:31 AM
    Any hint how to get the same effect of 
    .convert()
    on primitive integer/long, but in this case also applied to arrays. To be clear, something similar to this:
    Copy code
    val uIntOrULongArray = arrayof(15L.convert())
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  • m

    Mananpoddarm

    06/28/2020, 4:57 AM
    Hi everyone, how to debug .dll generated by kotlin/native for windows? are the .pdb files generated?
    r
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  • l

    Luoqiaoyou

    06/29/2020, 8:01 AM
    I have a concurrent question. Suppose I have a network IO task class with mutable state inside. Using thread pools to execute multiple network IO task instances would cause instances to be frozen in KN. If I specify a thread to each instance, the different elapsed times for each task may cause some threads to be busy and others to be idle. There is also a performance issue if you use atomic. Is there a more elegant way？
    a
    k
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  • a

    aleksey.tomin

    07/03/2020, 8:02 AM
    Hello I try to use wlanapi for mingw 1. Make wlanapi.def
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    package = wlanapi
headers = wlanapi.h
headerFilter = wlanapi.h
    2. Add to gradle build file
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    mingwX64("mingw") {
        compilations["main"].cinterops.create("wlanapi")
    }
    On gradlew I have error:
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    > Task :sdk:cinteropWlanapiMingw
Exception in thread "main" java.lang.Error: C:\Users\alxt\.konan\dependencies\msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1\x86_64-w64-mingw32\include\ntddndis.h:99:11: error: unknown type name 'ULONG
        at org.jetbrains.kotlin.native.interop.indexer.UtilsKt.ensureNoCompileErrors(Utils.kt:152)
        at org.jetbrains.kotlin.native.interop.indexer.IndexerKt.indexDeclarations(Indexer.kt:1003)
        at org.jetbrains.kotlin.native.interop.indexer.IndexerKt.buildNativeIndexImpl(Indexer.kt:992)
        at org.jetbrains.kotlin.native.interop.indexer.NativeIndexKt.buildNativeIndex(NativeIndex.kt:91)
        at org.jetbrains.kotlin.native.interop.gen.jvm.MainKt.processCLib(main.kt:230)
        at org.jetbrains.kotlin.native.interop.gen.jvm.MainKt.interop(main.kt:46)
        at org.jetbrains.kotlin.cli.utilities.InteropCompilerKt.invokeInterop(InteropCompiler.kt:44)
        at org.jetbrains.kotlin.cli.utilities.MainKt.mainImpl(main.kt:19)
        at org.jetbrains.kotlin.cli.utilities.MainKt.main(main.kt:37)
    Copy code
    gradlew --version                                                                                                                                                               
------------------------------------------------------------
Gradle 6.5.1
------------------------------------------------------------

Build time:   2020-06-30 06:32:47 UTC
Revision:     66bc713f7169626a7f0134bf452abde51550ea0a

Kotlin:       1.3.72
Groovy:       2.5.11
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          11.0.7 (<http://Amazon.com|Amazon.com> Inc. 11.0.7+10-LTS)
OS:           Windows 10 10.0 amd64
    kotlin: 1*.3.72* What can I do to fix it?
    a
    m
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  • w

    willyrs

    07/03/2020, 5:57 PM
    Hi all! Are you supposed to not store function in variables when using kotlin-native? I’ve written a reducer function for reduxkotlin like this: 
    val splashReducer: Reducer<SplashState> =  { state, action -> return state }
    and when I call it I have a EXC_BAD_ACCESS (code=1, address=0x0) error If I write the function like this: 
    fun splashReducer(state: SplashState, action: Any) : SplashState { return state }
    it works! Do you think it’s a problem with reduxkotlin or with kotlin-native? P.S. On kotlin-android it works with both
    a
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  • t

    tylerwilson

    07/03/2020, 8:10 PM
    Any clue on what this might mean:
    Copy code
    /Users/teamcity3/buildAgent/work/4d622a065c544371/runtime/src/main/cpp/ObjCExport.mm:345: runtime assert: Unable to add 'toKotlin:' method to NSBlock class
    I get this when accessing Kotlin/Native code from Objective-C and having a Swift Framework wrapper also present. Calling from Swift there is no issue.
    s
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  • p

    Piasy

    07/04/2020, 9:34 AM
    Hi guys, I want to debug an issue related to Kotlin/Native on iOS, so I want to use local built KN in my gradle multiplatform project, is there any guide about how to do this? Thank you!
    s
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  • i

    Iaroslav Postovalov

    07/05/2020, 4:53 PM
    Hello! How can I debug definitions? For example, these ones can't be linked.
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  • n

    napperley

    07/05/2020, 11:10 PM
    It appears as though the cinterop tool has generated incorrect mappings for the rabbitmq-c library ( https://github.com/alanxz/rabbitmq-c ). Trying to set the content_type field on a instance of amqp_basic_properties_t, based on the amqp_sendstring sample ( https://github.com/alanxz/rabbitmq-c/blob/master/examples/amqp_sendstring.c#L89 ). However the content_type field is read only instead of being writable.
    k
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  • n

    napperley

    07/06/2020, 3:31 AM
    Memory usage (RES) for the program I have developed (sunny_island_telemetry) is in good shape (holding steady at around 11.3 MB), which is impressive considering that Kotlin Native hasn't been heavily optimised for performance:
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    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
 1682 telemet+  20   0  113.0m  11.2m   3.3m S   0.0  0.3  63:40.01 node_expor+
 5342 telemet+  20   0  111.9m  11.3m   9.0m S   0.0  0.3   0:04.35 sunny_isla+
    By contrast node_exporter (a program written in Go - https://github.com/prometheus/node_exporter ) is using a similar amount of memory (around 11.2 MB). Unfortunately the Ktor Client library (the Kotlin Native version) can't be used by sunny_island_telemetry since it has the nasty habit of leaking memory badly, therefore the libcurl library is used to keep memory usage under control.
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  • a

    aleksey.tomin

    07/06/2020, 10:30 AM
    I try to use Windows WLan interface
    Copy code
    private fun ensureSuccess(result: UInt) {
        require(result.toInt() == ERROR_SUCCESS) { "WinApi error: $result"}
    }
...
    memScoped {
        val phClientHandle = alloc<HANDLEVar>()
        val version = alloc<DWORDVar>()
        ensureSuccess(WlanOpenHandle(2, null, version.ptr, phClientHandle.ptr))
        val ifsList = nativeHeap.allocArray<PWLAN_INTERFACE_INFO_LISTVar>(10)
        ensureSuccess(WlanEnumInterfaces(phClientHandle.ptr, null, ifsList))
    }
    The second call returns 6 
    ERROR_INVALID_HANDLE
     What am I doing wrong?
    s
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  • i

    Iaroslav Postovalov

    07/07/2020, 8:42 AM
    How can I call C function that accepts 
    va_list
    ?
    d
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  • a

    aleksey.tomin

    07/07/2020, 12:51 PM
    How can I parse XML in KN? 1. Can I use 
    org.jetbrains.kotlinx:kotlinx-serialization
    ? 2. I’ve found example for OSX but can’t understand how convert it to kotlin: https://stackoverflow.com/questions/21791702/nsxmlparser-simple-example 3. And how can I override this methods:
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    @kotlinx.cinterop.ExternalObjCClass public interface NSXMLParserDelegateProtocol : platform.darwin.NSObjectProtocol {
    @kotlinx.cinterop.ObjCMethod public open fun parser(parser: platform.Foundation.NSXMLParser, didEndMappingPrefix: kotlin.String): kotlin.Unit { /* compiled code */ }

    @kotlinx.cinterop.ObjCMethod public open fun parser(parser: platform.Foundation.NSXMLParser, foundCharacters: kotlin.String): kotlin.Unit { /* compiled code */ }
...
    s
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  • a

    aleksey.tomin

    07/08/2020, 6:18 AM
    I misunderstood with windows C interopt 😞 C code:
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    PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
WlanEnumInterfaces(hClient, NULL, &pIfList);
for (i = 0; i < (int) pIfList->dwNumberOfItems; i++) {
    PWLAN_INTERFACE_INFO pIfInfo = (WLAN_INTERFACE_INFO *) &pIfList->InterfaceInfo[i];
    How can I convert this code to kotlin?
    Copy code
    memScoped {
    val zeroValue: CValue<PWLAN_INTERFACE_INFO_LISTVar> = zeroValue()
    val ppInterfaceList: CPointer<CPointerVarOf<CPointer<_WLAN_INTERFACE_INFO_LIST>>> = zeroValue.getPointer(memScope)
    WlanEnumInterfaces(wlanHandle, null, ppInterfaceList)
    val pInterfaceList: CPointerVarOf<PWLAN_INTERFACE_INFO_LIST> = ppInterfaceList.pointed
    val interfaceList: PWLAN_INTERFACE_INFO_LIST? = pInterfaceList.value
    val wlanIfsInfoList: _WLAN_INTERFACE_INFO_LIST? = interfaceList?.pointed
    for (pIfInfo ????????)
}
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  • j

    Jamie Craane

    07/08/2020, 2:21 PM
    Will Kotlin Native in a future version support incremental compilation? One of the drawbacks at the moment is long compilation times when projects get bigger. We have some work arounds for it but a performance increase in compilation speed is a welcome addition.
    b
    s
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  • p

    Piasy

    07/12/2020, 12:12 PM
    Hi guys, I'm fighting with a KN runtime abort issue, the abort code is in 
    freezeSubgraph
    function of 
    Memory.cpp
    :
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    #if USE_GC
  // Now remove frozen objects from the toFree list.
  // TODO: optimize it by keeping ignored (i.e. freshly frozen) objects in the set,
  // and use it when analyzing toFree during collection.
  auto state = memoryState;
  for (auto& container : *(state->toFree)) {
    if (!isMarkedAsRemoved(container) && container->frozen()) {
      RuntimeAssert(newlyFrozen.count(container) != 0, "Must be newly frozen");  // <=== here
      container = markAsRemoved(container);
    }
  }
#endif
    The abort seems happen randomly, I really don't know what's wrong with my code. I tried to comment this line, it seems work fine, I'd like to know what's the possible problem if this condition is false? Would there be other problem if I comment this code? Thank you! I really need your help, genius at JB!
    a
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  • n

    napperley

    07/13/2020, 4:35 AM
    Encountering strange behaviour where the HTTP server isn't always responding with the right body in the response. What might cause the strange behaviour to occur? The sample project can be found here: https://gitlab.com/napperley/http-server
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  • a

    aleksey.tomin

    07/14/2020, 9:26 AM
    I try to use windows location manager and write the code (error checks exists by skiped):
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    val pSensorManager = zeroValue<ISensorManager>().getPointer(memScope)
            CoCreateInstance(CLSID_SensorManager.ptr, null, CLSCTX_INPROC_SERVER.toUInt(), IID_ISensorManager.ptr, pSensorManager.reinterpret())
            pSensorManager.pointed.lpVtbl?.pointed?.let { sensorManagerVtbl: ISensorManagerVtbl ->
                println("----AddRef: ${sensorManagerVtbl.AddRef?.rawValue}") // looks like a ref: 0x7ffebe937468
                println("----GetSensorsByCategory: ${sensorManagerVtbl.GetSensorsByCategory?.rawValue}") // looks like a ref: 0x-45520ff300000000
                println("----GetSensorsByType: ${sensorManagerVtbl.GetSensorsByType?.rawValue}") // look like error: 0x-1
                sensorManagerVtbl.AddRef?.invoke(pSensorManager) // Error: User-mode data execution prevention (DEP) violation at location 0x7ffebe937468
                sensorManagerVtbl.GetSensorsByCategory?.invoke(pSensorManager, SENSOR_CATEGORY_LOCATION.ptr, pSensorCollection) // The same error
    What do I wrong?
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  • m

    Madhava

    07/15/2020, 12:26 AM
    Does anyone know where the best place is to find discussion and information about Rust <-> JVM language FFI interop?
    t
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  • z

    zsperske

    07/16/2020, 12:48 AM
    Hey everyone, general question about using 
    cinterop
    for an iOS target. Besides the kotlin official docs, does anyone know of a good github example or blog post that details how to go about pulling a 
    .framework
    into your 
    iOSMain
    kotlin code?
    j
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  • a

    aleksey.tomin

    07/17/2020, 6:06 AM
    Hello I try to use microhttpd (like https://github.com/Kotlin/kotlinconf-spinner/blob/master/httpserver/src/hostMain/kotlin/server/HttpServer.kt) for localhost only (https://stackoverflow.com/questions/46023399/make-local-http-server-inaccessable-from-outside). On macOS
    Copy code
    val portShort = 8888.toUShort()
        val loopbackAddr = alloc<sockaddr_in>()
        loopbackAddr.sin_addr.s_addr = INADDR_LOOPBACK
        loopbackAddr.sin_family = AF_INET.convert()
        loopbackAddr.sin_port = portShort
...
        val daemon = MHD_start_daemon(
            MHD_USE_POLL_INTERNALLY,
            portShort,
            null,
            null,
            staticCFunction(::processRequest), cPointer,
            MHD_OPTION_SOCK_ADDR, loopbackAddr.ptr,
            MHD_OPTION_END
        )
    If I remove 
    MHD_OPTION_SOCK_ADDR, loopbackAddr.ptr
    - it works. But with this option daemon is null. What do I wrong?
    a
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  • p

    phldavies

    07/17/2020, 12:30 PM
    Is there any way to get a format a kotlin String from 
    msg: CPointer<ByteVar>?, args: va_list?
    ? I’m attempt to pass 
    staticCFunction { _: COpaquePointer?, msg: CPointer<ByteVar>?, args: va_list? -> }
    to an API but I’m not sure how to make use of the parameters.
    a
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  • u

    ursus

    07/18/2020, 5:18 AM
    How do you guys do DI? Manually with by lazy?
    w
    a
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  • p

    Paul Woitaschek

    07/18/2020, 8:25 AM
    Dagger for Android and a manual service locator for iOS
    u
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