Is there any library in kmp can do convert from byteArray into file? Then this file I will upload us...

# multiplatform

[hafiz]

Is there any library in kmp can do convert from byteArray into file? Then this file I will upload using ktor client.

[zt]

You can use okio to do this

[hafiz]

@zt but it doesn't show how to convert from byteArray into file

[Michael Paus]

Is this what you are looking for?

fun okio.Path.writeBytes(content: ByteArray) = okio.FileSystem.SYSTEM.write(this) { write(content) }

fun okio.Path.readBytes(): ByteArray = okio.FileSystem.SYSTEM.read(this) { return readByteArray() }

[hafiz]

okio.FileSystem.SYSTEM.write(this). what is this refer too?

[Robert Munro]

Do you need to save the file? The client will convert the file back into a byte array.

[hafiz]

I want convert from byte array into file. let say I got this value only:

@Serializable
data class ProfilePictureRequestUpdate(val imageArray: ByteArray)

How to do that?

[Caleb Kiage]

You don't need to convert to a file first before uploading. You can upload a byte array

[hafiz]

@Caleb Kiage yeah I do this :

client.put{
    url (queryUrl + pathProfileUpdate)
    setBody( MultiPartFormDataContent(
            formData {
                append(
                    key = keyUploadProfilePicture,
                    value = profilePicture.imageArray
                )
            }
        )
    )
}.body()

but the server return 500

[hafiz]

all details about the server in here : https://youtrack.jetbrains.com/issue/KTOR-7273#focus=Comments-27-10257241.0-0

[Robert Munro]

https://github.com/ktorio/ktor-documentation/blob/2.3.12/codeSnippets%2Fsnippets%2Fclient-upload%2Fsrc%2Fmain%2Fkotlin%2Fcom%2Fexample%2FApplication.kt

[hafiz]

@Robert Jaros the problem is that I didn't know what is image type and fileName. I only have byteArray/ImageBitmap that's all

[Caleb Kiage]

Multipart form data is for files I think, octet-stream is for bytes (but the server has to allow it)

[Robert Munro]

Just make up a string for filename.

[Robert Munro]

See how file. ReadBytes just returns the byte array so you don't need to save the file

[hafiz]

yeah but the headers required contentType and contentDisposition. so in this case how do i get this information from byteArray?

[Caleb Kiage]

Try image/bmp for a bitmap image

[Caleb Kiage]

You should know the type if you're showing it on your app

[hafiz]

I use third party library to capture image camera and gallery. that library just provided imageBitmap and byteArray only. By the way I try but server return 505 with message request to long? what does meaning of this? when test upload in postman type is file no have issue.

[Robert Munro]

You can convert the bitmap to png in memory on android there are loads of examples online.

[Robert Munro]

Will save bandwidth

[streetsofboston]

Capture the server request on a tool like Wireshark (or any other that can monitor http traffic). Look at the successful one from Postman and the failing one from Android and examine the differences.

[streetsofboston]

(just read the youtrack ticket and someone recommends doing the same ^^^)

[streetsofboston]

And do you upload (.imageArray) the PNG/jpg data, not the raw ARGB data of the bitmap?

[hafiz]

I have upload imageArray but server return 500 request too long. Second time, I got respond "No update data provided" which return 500 error code. @streetsofboston

[hafiz]

@Robert Jaros the problem is that mine just kotlin multiplatform and not only android.