I am trying to center crop a `UIImage` in iOS and convert the cropped version to a `ByteArray` to se...

# multiplatform

[Justin Xu]

I am trying to center crop a UIImage in iOS and convert the cropped version to a ByteArray to send through HTTP, is this correct?

val croppedUIImage = bitmap.image.CGImage?.let { cgImage ->
    val width = CGImageGetWidth(cgImage).toDouble()
    val height = CGImageGetHeight(cgImage).toDouble()

    val squareSize = minOf(width, height)
    val x = (width - squareSize) / 2
    val y = (height - squareSize) / 2

    val rect = CGRectMake(x, y, squareSize, squareSize)

    UIImage(CGImageCreateWithImageInRect(image = cgImage, rect = rect))
} ?: throw NullPointerException("Null CGImage")

val nsData = UIImagePNGRepresentation(croppedUIImage)
    ?: throw CharacterCodingException("Can't represent UIImage as PNG")

return ByteArray(nsData.length.toInt()).apply {
    usePinned {
        memcpy(it.addressOf(0), nsData.bytes, nsData.length)
    }
}

When I send this as image/png, I get a "Bad Content-Type format: text; charset=utf-8" error

[ayodele]

Are you sending it using Ktor??

[Justin Xu]

Yes, attaching byte array as body

[ayodele]

I think your content type is wrong.

[ayodele]

Check the API you are uploading to. When uploading to Google drive we use ContentType.Multipart.FormData

Anything else, we get a bad content type error

[Justin Xu]

Well yes, the error is telling me the content type is wrong. I'm trying to figure out if it's an issue with the way I'm generating the ByteArray in iOS, since the process of image -> bytearray -> send through HTTP works in Android. For context, I am uploading to AWS API Gateway, and sending the image file as binary data through Ktor as image/png has been working fine for me

[ayodele]

Okay. Your code to convert nsdata to ByteArray is correct. That's what we use currently.

Maybe you should try to save the result of the cropped image. I guess you tried that