How can I change a global variable from another th...

# kotlin-native

[Roman]

How can I change a global variable from another thread.
I tried "@ kotlin.native.SharedImmutable"
but this led to the error: "IncorrectDereferenceException: Trying to get it out of the non-main thread
"

Kt.txt

[Dominaezzz]

Have you tried an AtomicReference<String>?

[Roman]

No, I just started getting acquainted with writing code, and did not know about it. If not difficult, a brief explanation of how to use it. I will study descriptions on the Internet for now.

[Dominaezzz]

@kotlin.native.SharedImmutable var lang = AtomicReference("").

[Dominaezzz]

lang.value = "Thread".

[Dominaezzz]

That should do it.

[Roman]

Same mistake
IncorrectDereferenceException: Trying to access top level value not marked as @ThreadLo
cal or @SharedImmutable from non-main thread

[svyatoslav.scherbina]

Declare it as val instead.

[Roman]

Yes it changes the value, thanks. But the flow collapses after 3 passes (this is very similar to the question I asked above), is this a difficult question? Can I count on a hint?

Kt.txt

[Dominaezzz]

Sorry, what do you mean by the flow collapses?

[svyatoslav.scherbina]

Please refer to GetKeyboardLayoutName documentation.

[Roman]

Is this you pointing to my mistake using the GetKeyboardLayoutName function?same C # code works without problems

[Roman]

flow collapses - it means the program ends. And try -catch does not catch errors

[Dominaezzz]

Try val Input = allocArray<WCHARVar>(KL_NAMELENGTH) instead.

[Dominaezzz]

And change Input.ptr to just Input.

[Dominaezzz]

Although you'll want to check the return value of the call to GetKeyboardLayoutName before calling toKString(). https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-getkeyboardlayoutnamew

[Roman]

Why should I use allocArray <WCHARVar> instead of alloc <WCHARVar>?
In val Input, a value equal to" 00000409 "is written, why is an array allocated for it?
What phrase in the documentation is understandable?Thanks a lot, it made the code work, but it didn't make me understand.

[Dominaezzz]

The buffer (of at least KL_NAMELENGTH characters in length) that receives the name of the input locale identifier, including the terminating null character. This will be a copy of the string provided to the LoadKeyboardLayout function, unless layout substitution took place.

[Dominaezzz]

It requires a buffer (array of bytes) instead of a pointer to a single character.

[Roman]

So buffer = array.
This will fix a lot of mistakes on the future, thanks, thank you!)

[Roman]

But still, he writes a value to it once. Then it goes out of the memScoped block, and therefore it must be able to write the value a second time, no?

[Dominaezzz]

It should be able to. I'm not sure why your program stops.

[Roman]

So it is possible to write the value in alloc <WCHARVar>, did I understand you correctly?

[Dominaezzz]

No, it writes out a series of values, so an array is required. (Unless KL_NAMELENGTH == 1).

[Roman]

and when I allocate WCHARVar is it not an array or is it a single cell array?
There is an example that shows that you can write a long value

int main ()
{
    const wchar_t * s = L "Hello, World!";

    std :: wcout << s << std :: endl;
}

And I get to write the value, but only once.

[Dominaezzz]

It is a single cell array.

[Roman]

Thanks you