Kotlin multiplatfrom

[shadmanadman]

Hi there. First I know this question might be silly but i'm stuck for weeks now.

I'm trying to use tdlib in a kotlin multiplatfrom project. I successfully integrated the Android part using the JNI. You can see the android structure part:

But i'm confused for the ios and desktop (macos) part. I build the td lib based on the ios example and I have these folders after the build:

first I try to use the xcframework as you can see here:

but I got nowhere with this.

second I try to use the koltin/native by importing the dylib and headers files:

But still I got no progress here.

There may be a misunderstanding, but I can not figure it out.
Please, any clue or point would be appreciated here.

[shadmanadman]

Update:
So far for ios I managed to access the tdlib functions using cintreop. here is the def file:

package = tdlib
headers = /Users/shadmanadman/AndroidStudioProjects/KMP-TdLib-git/composeApp/native/include/td/telegram/td_json_client.h
libraryPaths.ios = /Users/shadmanadman/AndroidStudioProjects/KMP-TdLib-git/composeApp/native/lib/iOS-simulator
linkerOpts.ios = -L/Users/shadmanadman/AndroidStudioProjects/KMP-TdLib-git/composeApp/native/lib/iOS-simulator -ltdjson

here is the native folder:

but after calling for example td_create_client() from iosMain:

import androidx.compose.ui.window.ComposeUIViewController
import kotlinx.cinterop.ExperimentalForeignApi
import tdlib.*
@OptIn(ExperimentalForeignApi::class)
fun MainViewController() = ComposeUIViewController {
    td_create_client_id()
    App()
}

I get this error:

Undefined symbols for architecture arm64:
  "_td_create_client_id", referenced from:
      _tdlib_td_create_client_id_wrapper0 in ComposeApp[2](ComposeApp.framework.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[shadmanadman]

Update 2-mar-2025:
I found a better idea. We can create a Kotlin/native library to integrate with tdlib with C interop. Then we use this library in our KMP project. Can we do that?
I think in this way we do not need to integrate tdlib for each platform.

[levlam]

Integration shouldn't be different from integration with any other native shared library. There should be multiple tutorials for this, but I didn't do this myself for an iOS app in Kotlin and can't help with the exact steps.

[shadmanadman]

@levlam Thank you.
Unfortunately, the number of resources and tutorials is very low in this case. Just some official samples and some answers/questions.
I'm aiming for tdlib. I will continue to update my progress on this issue if it's ok.

[shadmanadman]

Update 4-mar-2025:

For now, lets forget about kotlin/native.

I successfully managed to run tdlib functions on desktop using JNI. Now there are some key points here:

• You need to link your jni.c file, which contains your jni function to the actual libtdjson.dylib for macOS (or dll on Windows) and create a new dylib (or dll) file.
• When you are loading the library, you need to load the new dylib file that you created.
• When you create a new dylib and linked to the libtdjson.dylib, after running it needs the path of the actual dylib (in this case libtdjson.dylib). You need to specify the -rpath (runtime search path).

Here is a sample to create a new dylib file that will link the jni.c file and libtdjson.dylib , and also specify the -rpath:

clang -shared -o libtdlib_jni.dylib TdLibJNI.c \
  -I$(/usr/libexec/java_home)/include \
  -I$(/usr/libexec/java_home)/include/darwin \
  -L{path to libtdjson.dylib for macOS} \
  -ltdjson \
  -Wl,-rpath,{path to libtdjson.dylib for macOS}

next step is iOS