//-----Execute at page load-----
public MainPage()
{
this.InitializeComponent();
for (int i = 0; i <= 99; i++)
{
FilePreview.Items.Add((string)"Text to send line " + i.ToString());
}
FilePreview.SelectedIndex = 0;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
}
//-----Task for Feeding Lines to Serial Port
private async Task FeedTask()
{
FeedActive = true;
string s = "";
int i = 0;
int c = 0;
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
i = FilePreview.SelectedIndex;
c = FilePreview.Items.Count;
});
while (i < c)
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
s = FilePreview.SelectedItem.ToString();
});
//This commented code was used to bypass the Datawriter for testing
/*s = s += "\r\n";
* StringBuilder sb = new StringBuilder();
* sb.Insert(0, s);
* Windows.Storage.Streams.IBuffer b;
* byte[] ba1 = Encoding.UTF8.GetBytes(s);
* b = ba1.AsBuffer();
* uint x = await Port.OutputStream.WriteAsync(b);*/
s = s += "\r\n";
PortDataWriter.WriteString(s);
Task <UInt32> storeAsyncTask;
storeAsyncTask = PortDataWriter.StoreAsync().AsTask(); //<----This is where program hangs
uint x = await storeAsyncTask;
if (x != 0)
{
i++;
if (i < c)
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
FilePreview.SelectedIndex = i;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
});
}
else
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
FilePreview.SelectedIndex = 0;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
});
EnableFeed = false;
}
}
if (EnableFeed == false)
{
break;
}
}
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
SingleBtn.IsEnabled = true;
FeedBtn.Icon = new SymbolIcon(Symbol.Play);
});
FeedActive = false;
}
