private async void doPreload(String url, Func0 onSuccess, Func1 onError)
{
try
{
await media.getCachedObjectAsync(new Uri(base_url, url.TrimStart('/')));
if (!runtime.IsRunning)
{
return;
}
using (var ctx = new FlowRuntime.DeferredContext(runtime))
{
onSuccess();
}
}
catch (Exception e)
{
if (!runtime.IsRunning)
{
return;
}
using (var ctx = new FlowRuntime.DeferredContext(runtime))
{
onError(e.ToString());
}
}
}
private async void execLater(int ms, Func0 cb)
{
if (!runtime.IsRunning)
{
return;
}
if (ms < 10)
{
await Task.Yield();
}
else
{
await Task.Delay(ms);
}
if (!runtime.IsRunning)
{
return;
}
using (var ctx = new FlowRuntime.DeferredContext(runtime))
{
cb();
}
}
private async void submitRequest(HttpRequestMessage message, Func1 onData, Func1 onError, Func1 onStatus)
{
try
{
string data = null;
bool success = false;
HttpResponseMessage response;
try
{
response = await client.SendAsync(message, HttpCompletionOption.ResponseHeadersRead);
try
{
if (!runtime.IsRunning)
{
return;
}
using (var ctx = new FlowRuntime.DeferredContext(runtime))
{
onStatus((int)response.StatusCode);
}
if (!response.IsSuccessStatusCode)
{
data = "HTTP status " + response.StatusCode + " " + response.ReasonPhrase;
}
else
{
var charset = response.Content.Headers.ContentType.CharSet;
var enc = (charset != null) ? charset.ToLowerInvariant() : "";
if (enc == "utf-16") // binary
{
var bytes = await response.Content.ReadAsByteArrayAsync();
int bias = (bytes.Length >= 2 && bytes[0] == 0xFF && bytes[1] == 0xFE) ? 1 : 0;
var chars = new char[bytes.Length / 2 - bias];
for (int i = 0, j = 2 * bias; i < chars.Length; i++, j += 2)
{
chars[i] = (char)((int)bytes[j] | ((int)bytes[j + 1]) << 8);
}
data = new String(chars);
}
else
{
data = await response.Content.ReadAsStringAsync();
}
success = true;
}
}
finally
{
response.Dispose();
}
}
catch (Exception e)
{
success = false;
data = e.ToString();
}
if (!runtime.IsRunning)
{
return;
}
using (var ctx = new FlowRuntime.DeferredContext(runtime))
{
if (success)
{
onData(data);
}
else
{
onError(data);
}
}
}
finally
{
message.Dispose();
}
}