Trying to send back a jstring from kotlin native j...

# kotlin-native

[JoakimForslund]

Trying to send back a jstring from kotlin native jni-bridge, is there a way to create/convert a kotlin string to a jstring? Example I have now:

@CName("Java_com_example_project_createString")
fun createString(env: kotlinx.cinterop.CPointer<JNIEnvVar>, instance: jobject):jstring?{
    val jniNativeInterface: JNINativeInterface = env.pointed.pointed!!
    val fNewStringUTF = jniNativeInterface.NewStringUTF!!
    val result = fNewStringUTF(env, "A test")
    return result
}

Where the 'A test' part wont work, because of it not being a jstring

[JoakimForslund]

I suppose doing:

var jstringConverted = memScoped {
        return@memScoped "my string".cstr.ptr
    }

and then doing:

val result = fNewStringUTF8(env, jstringConverted)

Takes me some of the way

[JoakimForslund]

but that brings utf8 issues back to jvm

[svyatoslav.scherbina]

because of it not being a jstring

This is not related.

I suppose doing:

Your string gets deallocated before fNewStringUTF8 here.
Try

val result = memScoped {
    fNewStringUTF8(env, "my string".cstr.ptr)
}

[JoakimForslund]

Thanks dude, spot on

[msink]

Why convert to UTF8 and back, doesn't work just

val result = memScoped {
    NewString(env, "my string".utf16.ptr)
}