In my efforts to create a progress indicator for uploading videos using HttpClient (SendAsync) in Xamarin Forms, I now have to ask for assistance.
The upload itself works fine, and all other API calls, but when I try to create a custom HttpContent to track the progress of the upload the project won't even build any more.
Error MT3001: Could not AOT the assembly '[...].iOS/obj/iPhone/Debug/build-iphone7.2-10.1.1/mtouch-cache/Build/theproject.dll' (MT3001) (theproject.iOS)
Using StreamContent or ByteArrayContent instead the project builds, but I can't get it working to track the progress.
A snippet of code (this is minimal example):
public class ProgressableContent : HttpContent
{
private const int defaultBufferSize = 4096;
private Stream content;
private int progress;
public ProgressableContent(Stream content)
{
this.content = content;
}
protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
{
return Task.Run(async () =>
{
var buffer = new byte[defaultBufferSize];
var size = content.Length;
var uploaded = 0;
using (content) while (true)
{
var length = content.Read(buffer, 0, buffer.Length);
if (length <= 0) break;
uploaded += length;
progress = (int)((float)uploaded / size * 100);
await stream.WriteAsync(buffer, 0, length);
}
});
}
protected override bool TryComputeLength(out long length)
{
length = content.Length;
return true;
}
}
I use this by transforming my byte's to a stream, hopefully correctly:
//... building httpMessage.
httpMessage.Content = new ProgressableContent(await byteArrayContent.ReadAsStreamAsync());
//...
var response = await _httpClient.SendAsync(httpMessage, Cancellation.Token);
//...
The question(s): Am I somehow causing the error? Is there a "better" way to do this?
Tagged this with Xamarin.iOS also since monotouch is complaining.
