Hi, I’m trying to use CUrl <https://github.com/JetBrains/kotlin-native/blob/master/samples/libcurl/s...

# kotlin-native

[aleksey.tomin]

Hi,
I’m trying to use CUrl https://github.com/JetBrains/kotlin-native/blob/master/samples/libcurl/src/libcurlMain/kotlin/CUrl.kt for POST data
I’ve added SSL

curl_easy_setopt(curl, CURLOPT_PORT, 443L)
curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS)

and method POST

fun post(postData: String) {
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headersCRef)
    val cstr = postData.cstr
    curl_easy_setopt(curl, CURLOPT_POST, 1)
    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, cstr)
    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, cstr.size)
    val res = curl_easy_perform(curl)
    curl_slist_free_all(headersCRef)
    if (res != CURLE_OK) {
        throw RuntimeException("curl_easy_perform() failed: ${curl_easy_strerror(res)?.toKString()}")
    }
}

But the server accepts wrong data - without some chars (at the start or at the end).
What I do wrong? How it can be fixed?

FIXED:
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, cstr) ->
_curl_easy_setopt_(curl, _CURLOPT_POSTFIELDS_, cstr.getPointer(MemScope()))

[napperley]

Alternatively you can use CURLOPT_COPYPOSTFIELDS instead of CURLOPT_POSTFIELDS, which will do a copy by value.

[aleksey.tomin]

I’ve tried it, but without getPointer(MemScope()) it didn’t work 🙂

[v79]

Slack is a goldmine for information... I've no idea what

data.cstr.getPointer(MemScope())

actually does, but it does work. Thank you, @aleksey.tomin, I've been trying for hours to get a curl POST to work. And I agree, `CURLOPT_COPYPOSTFIELDS`doesn't work; in fact, it seems to hang the application.

[aleksey.tomin]

Now I use ktor-client-curl. I think it's the best way

[v79]

I tried that but I don't think they have a version of ktor which works on LinuxArm32Hfp for my Raspberry Pi.