private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
try
{
// this.Background = new SolidColorBrush(Color.FromArgb(255,128, 128, 128));
if (AnalyticsInfo.VersionInfo.DeviceFamily == "Windows.IoT")
{
// "Windows.Desktop"
// "Windows.Mobile" (phone)
// "Windows.IoT"
_fUseNetworkTime = true;
}
Action resetCameras = () =>
{
lock (_timerLock)
{
_cameraDevices = null;// force reload
}
};
var deviceWatcher = DeviceInformation.CreateWatcher(DeviceClass.VideoCapture);
deviceWatcher.Added += new TypedEventHandler <DeviceWatcher, DeviceInformation>(
(wat, info) => { resetCameras(); });
deviceWatcher.Removed += new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(
(wat, info) => { resetCameras(); });
deviceWatcher.Updated += new TypedEventHandler <DeviceWatcher, DeviceInformationUpdate>(
(wat, info) => { resetCameras(); });
deviceWatcher.Stopped += new TypedEventHandler <DeviceWatcher, object>(
(wat, obj) => { deviceWatcher.Start(); });
deviceWatcher.Start();
var relPanel = new RelativePanel();
var spCtrls = new StackPanel()
{
Orientation = Orientation.Horizontal
};
_img.HorizontalAlignment = HorizontalAlignment.Center;
_img.Stretch = Stretch.UniformToFill;
_btnSwitchCamera = new Button()
{
IsEnabled = _cameraDevices?.Count > 1,
Width = 260
};
SetBtnSwitchLabel();
ToolTipService.SetToolTip(_btnSwitchCamera, new ToolTip()
{
Content = "Click to switch camera if available"
});
spCtrls.Children.Add(_btnSwitchCamera);
_btnSwitchCamera.Click += (oc, ec) =>
{
IncrementCameraInUse();
SetBtnSwitchLabel();
};
_chkCycleCameras = new CheckBox()
{
Content = "Cycle Cameras",
IsChecked = false
};
ToolTipService.SetToolTip(_chkCycleCameras, new ToolTip()
{
Content = "Automatically switch through all attached cameras"
});
spCtrls.Children.Add(_chkCycleCameras);
relPanel.Children.Add(spCtrls);
var tbInterval = new TextBox()
{
Text = "7"
};
spCtrls.Children.Add(tbInterval);
var btnQuit = new Button()
{
Content = "Quit"
};
spCtrls.Children.Add(btnQuit);
btnQuit.Click += (oq, eq) =>
{
lock (_timerLock)
{
// make sure we're done with cam before exit
Application.Current.Exit();
}
};
spCtrls.Children.Add(_tbStatus);
relPanel.Children.Add(_img);
RelativePanel.SetBelow(_img, spCtrls);
var tmr = new DispatcherTimer();
tmr.Interval = TimeSpan.FromSeconds(4);
tbInterval.LostFocus += (otb, etb) =>
{
double n;
if (double.TryParse(tbInterval.Text, out n))
{
tmr.Interval = TimeSpan.FromSeconds(n);
}
};
bool fIsInTickRoutine = false;
_tsSinceLastTimeCheck = TimeSpan.FromDays(1); // force time check
tmr.Tick += async(ot, et) =>
{
if (!fIsInTickRoutine)
{
fIsInTickRoutine = true;
if (Monitor.TryEnter(_timerLock))
{
try
{
if (_fUseNetworkTime)
{
_tsSinceLastTimeCheck += tmr.Interval;
if (_tsSinceLastTimeCheck.TotalMinutes >= 1)
{
// resync the clock
try
{
_dtLastTimeCheck = await NtpClient.GetDateTimeAsync();
_tsSinceLastTimeCheck = TimeSpan.Zero;
}
catch (Exception ex)
{
_tbStatus.Text = ex.ToString(); // task cancelled exception
}
}
}
await LookForCameraAndTakeAPicture();
}
finally
{
Monitor.Exit(_timerLock);
}
}
fIsInTickRoutine = false;
}
};
tmr.Start();
this.Content = relPanel;
}
catch (Exception ex)
{
this.Content = new TextBlock()
{
Text = ex.ToString()
};
}
}
public async static Task <DateTime> GetDateTimeAsync()
{
var ntpClient = new NtpClient();
return(await ntpClient.GetNetworkTimeAsync());
}