/// <summary>
/// Task that uploads queue to server
/// </summary>
private async void UploadTask(Page sender)
{
try
{
while (ConnectionStatus)
{
if (TransferQueue.Count != 0)
{
TransferQueue[0].Stream.Position = 0;
BinaryReader r = new BinaryReader(TransferQueue[0].Stream);
//Message format (datasize FILENAME/DATASIZE DATA) without spaces and brackets
//Byte representation of filename
byte[] name = Encoding.ASCII.GetBytes(TransferQueue[0].Name + '/');
//Byte respresentation of image data
byte[] imageData;
using (var memoryStream = new MemoryStream())
{
TransferQueue[0].Stream.CopyTo(memoryStream);
imageData = memoryStream.ToArray();
}
//byte representation of package size
byte[] totalLen = BitConverter.GetBytes(name.Length + imageData.Length + 4);
byte[] package = new byte[name.Length + imageData.Length + 4];
System.Array.Copy(totalLen, 0, package, 0, totalLen.Length);
System.Array.Copy(name, 0, package, totalLen.Length, name.Length);
System.Array.Copy(imageData, 0, package, totalLen.Length + name.Length, imageData.Length);
NetworkStream s = DataClient.GetStream();
int totalSentBytes = 0;
int packetSize = 4096;
while (totalSentBytes != package.Length)
{
int leftToSend = package.Length - totalSentBytes;
if (leftToSend > packetSize)
{
s.Write(package, totalSentBytes, packetSize);
totalSentBytes += packetSize;
}
else
{
s.Write(package, totalSentBytes, leftToSend);
totalSentBytes += leftToSend;
}
}
string n = TransferQueue[0].Stream.Name;
TransferQueue.RemoveAt(0);
File.Delete(n);
}
await Task.Delay(20);
}
}
catch
{
Device.BeginInvokeOnMainThread(async() =>
{
await sender.DisplayAlert("Error", "Server is not responding", "OK");
ConnectionStatus = false;
});
}
}