How to acquire and display data from labview to excel simultaneously

hello,
I am using the NI-DAQ to measure the falling edges of a clock and display them into a table. What I need is to display these data in a table in excel while the program is running. In addition, when I receive a pulse from an external clock, for which I have created a digital channell, the data must be logged in a different column. In other words, every time I receive a pulse the data must be stored in the adjacent column in excel.

Hello Evangelos,
As far as I know and have experienced, it is not possible to access a spreadsheet file (or any file, for that matter) by two programs at the same time, you will get an error.
Also, a couple of observations on your code:
A constant wired to a case selector of a case structure makes no sense as the false case will never be executed.
Move the DAQmx Read from your Digital Input task into the while loop, as the DAQmx Read will only read once and the wire won’t get information in or out of a while loop as long as the while loop is iterating.
Regards,
Daniel REDS
RF Systems Engineer
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// Directives
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using iClips.Resources;
using System.ComponentModel;
using System.Threading;
using System.IO;
using System.IO.IsolatedStorage;
using Microsoft.Devices;
using System.Windows.Media;
using Microsoft.Xna.Framework.Media;
using System.Windows.Media.Imaging;
using System.Threading.Tasks;
using System.Text;
using Windows.Storage;
using System.Windows.Threading;
using System.Diagnostics;
using System.Globalization;
namespace iClips
public partial class MainPage : PhoneApplicationPage
Boolean bSignUp;
HyperlinkButton BtnSignIn, BtnSignUp, BtnSignUpSubmit;
TextBox TbUN, TbPW, TbCPW, TbEmail;
TextBlock un, title;
System.DateTime startTime;
// Viewfinder for capturing video.
private VideoBrush videoRecorderBrush;
// Source and device for capturing video.
private CaptureSource captureSource;
private CaptureDevice vcDevice;
double w, h;
// File details for storing the recording.
private IsolatedStorageFileStream isoVideoFile;
private FileSink fileSink;
private string isoVideoFileName = "CameraMovie.mp4";
// For managing button and application state.
private enum ButtonState { Initialized, Stopped, Ready, Recording, Playback, Paused, NoChange, CameraNotSupported };
private ButtonState currentAppState;
//create reference to SocketClient
SocketClient sock = new SocketClient();
// Constructor
public MainPage()
InitializeComponent();
//setup recording
// Prepare ApplicationBar and buttons.
PhoneAppBar = (ApplicationBar)ApplicationBar;
PhoneAppBar.IsVisible = true;
StartRecording = ((ApplicationBarIconButton)ApplicationBar.Buttons[0]);
StopPlaybackRecording = ((ApplicationBarIconButton)ApplicationBar.Buttons[1]);
StartPlayback = ((ApplicationBarIconButton)ApplicationBar.Buttons[2]);
PausePlayback = ((ApplicationBarIconButton)ApplicationBar.Buttons[3]);
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txtDebug.Text = "Welcome to iClips.";
string result = sock.Connect("197.189.214.116", 5000);
txtOutput.Text = result;
if(result.Contains("success")){
sock.Send("#testing_");
SetScreenResolution();
//set image on load friends
/*Uri uri = new Uri("/Assets/home_icons/myFriends.png", UriKind.Relative);
BitmapImage imgSource = new BitmapImage(uri);
Image image = new Image();
image.Source = imgSource;
load_friends.Content = image;*/
SignIn();
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// remove all elements inside sign grid
for (int index = MyGrid.Children.Count - 1; index >= 0; index--)
MyGrid.Children.RemoveAt(index);
BtnSignIn = new HyperlinkButton();
BtnSignIn.Content = "<< Sign In >>";
BtnSignIn.Click += new RoutedEventHandler(SignIn_Tab);
BtnSignIn.VerticalAlignment = VerticalAlignment.Bottom;
BtnSignUp = new HyperlinkButton();
BtnSignUp.Content = "<< I'm new here. Sign Up. >>";
BtnSignUp.Click += new RoutedEventHandler(SignUp_Tab);
BtnSignUp.VerticalAlignment = VerticalAlignment.Bottom;
un = new TextBlock();
un.Text = "Enter your Username:";
un.VerticalAlignment = VerticalAlignment.Bottom;
un.HorizontalAlignment = HorizontalAlignment.Center;
TextBlock pw = new TextBlock();
pw.Text = "Enter your Password:";
pw.VerticalAlignment = VerticalAlignment.Bottom;
pw.HorizontalAlignment = HorizontalAlignment.Center;
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TbUN = new TextBox();
TbUN.Opacity = 0.5;
TbUN.Text = "";
TbUN.FontSize = 16;
TbUN.FontWeight = FontWeights.ExtraBold;
TbUN.Foreground = new SolidColorBrush(Colors.Black);
TbUN.Background = new SolidColorBrush(Colors.Transparent);
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TbUN.Height = 70;
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TbPW = new TextBox();
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TbPW.Text = "";
TbPW.FontSize = 16;
TbPW.FontWeight = FontWeights.ExtraBold;
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TbPW.VerticalAlignment = VerticalAlignment.Top;
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MyGrid.RowDefinitions.Add(gridRow0);
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RowDefinition gridRow1 = new RowDefinition();
gridRow1.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow1);
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RowDefinition gridRow2a = new RowDefinition();
gridRow2a.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow2a);
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RowDefinition gridRow2 = new RowDefinition();
gridRow2.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow2);
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RowDefinition gridRow3 = new RowDefinition();
gridRow3.Height = new GridLength(60);
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Grid.SetColumn(un, 0);
Grid.SetRow(TbUN, 1);
Grid.SetColumn(TbUN, 0);
Grid.SetRow(pw, 2);
Grid.SetColumn(pw, 0);
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MyGrid.Children.Add(TbUN);
MyGrid.Children.Add(pw);
MyGrid.Children.Add(TbPW);
MyGrid.Children.Add(BtnSignIn);
MyGrid.Children.Add(BtnSignUp);
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title.HorizontalAlignment = HorizontalAlignment.Center;
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TbUN.FontWeight = FontWeights.ExtraBold;
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TbUN.Background = new SolidColorBrush(Colors.Transparent);
TbUN.VerticalAlignment = VerticalAlignment.Top;
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TbPW.Opacity = 0.5;
TbPW.Text = "Password";
TbPW.FontSize = 16;
TbPW.FontWeight = FontWeights.ExtraBold;
TbPW.Foreground = new SolidColorBrush(Colors.Black);
TbPW.Background = new SolidColorBrush(Colors.Transparent);
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TbCPW.Opacity = 0.5;
TbCPW.Text = "Confirm Password";
TbCPW.FontSize = 16;
TbCPW.FontWeight = FontWeights.ExtraBold;
TbCPW.Foreground = new SolidColorBrush(Colors.Black);
TbCPW.Background = new SolidColorBrush(Colors.Transparent);
TbCPW.VerticalAlignment = VerticalAlignment.Top;
TbCPW.Height = 70;
TbCPW.Tap += TbCPW_Tap;
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TbEmail.Opacity = 0.5;
TbEmail.Text = "Email (Optional)";
TbEmail.FontSize = 16;
TbEmail.FontWeight = FontWeights.ExtraBold;
TbEmail.Foreground = new SolidColorBrush(Colors.Black);
TbEmail.Background = new SolidColorBrush(Colors.Transparent);
TbEmail.VerticalAlignment = VerticalAlignment.Top;
TbEmail.Height = 70;
TbEmail.Tap += TbEmail_Tap;
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BtnGoBack.VerticalAlignment = VerticalAlignment.Bottom;
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BtnSignUpSubmit.Content = "<< Sign Up >>";
BtnSignUpSubmit.Click += new RoutedEventHandler(BtnSignUpSubmit_Tab);
BtnSignUpSubmit.VerticalAlignment = VerticalAlignment.Bottom;
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gridRow0.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow0);
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RowDefinition gridRow1 = new RowDefinition();
gridRow1.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow1);
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RowDefinition gridRow2a = new RowDefinition();
gridRow2a.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow2a);
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RowDefinition gridRow2 = new RowDefinition();
gridRow2.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow2);
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RowDefinition gridRow3 = new RowDefinition();
gridRow3.Height = new GridLength(60);
MyGrid.RowDefinitions.Add(gridRow3);
//create row for << Sign Up >>
RowDefinition gridRow4 = new RowDefinition();
gridRow4.Height = new GridLength(120);
MyGrid.RowDefinitions.Add(gridRow4);
//create row for << Go Back >>
RowDefinition gridRow5 = new RowDefinition();
gridRow5.Height = new GridLength(120);
MyGrid.RowDefinitions.Add(gridRow5);
Grid.SetRow(title, 0);
Grid.SetColumn(title, 0);
Grid.SetRow(TbUN, 1);
Grid.SetColumn(TbUN, 0);
Grid.SetRow(TbPW, 2);
Grid.SetColumn(TbPW, 0);
Grid.SetRow(TbCPW, 3);
Grid.SetColumn(TbCPW, 0);
Grid.SetRow(TbEmail, 4);
Grid.SetColumn(TbEmail, 0);
Grid.SetRow(BtnSignUpSubmit, 5);
Grid.SetColumn(BtnSignUpSubmit, 0);
Grid.SetRow(BtnGoBack, 6);
Grid.SetColumn(BtnGoBack, 0);
MyGrid.Children.Add(title);
MyGrid.Children.Add(TbUN);
MyGrid.Children.Add(TbPW);
MyGrid.Children.Add(TbCPW);
MyGrid.Children.Add(TbEmail);
MyGrid.Children.Add(BtnSignUpSubmit);
MyGrid.Children.Add(BtnGoBack);
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int d;
if (str.Length > 30)
MessageBox.Show("You may only use a maximum of 30 characters for your Username.\nThank you.");
return false;
for (d = 0; d < str.Length; d++)
if (str.Contains("~") || str.Contains("!") || str.Contains("@") || str.Contains("$")
|| str.Contains("#") || str.Contains("%") || str.Contains("|") || str.Contains("_"))
MessageBox.Show("Your Username may not contain any of the follwing characters: \n~ ! @ # $ % | _\nThank you.");
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if(TbEmail.Text.Contains("@") && TbEmail.Text.Contains("."))
data += "&email=" + TbEmail.Text;
System.Uri URL = new Uri("http://www.iclips.co.za/RegisterUsernameAndPassword.php");
WebRequest webRequest = WebRequest.Create(URL);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = data.Length;
//we first obtain an input stream to which to write the body of the HTTP POST
webRequest.BeginGetRequestStream((IAsyncResult result) =>
HttpWebRequest preq = result.AsyncState as HttpWebRequest;
if (preq != null)
Stream postStream = preq.EndGetRequestStream(result);
//guess one could just accept a byte[] [via function argument] for arbitrary data types - images, audio,...
byte[] dataStream = Encoding.UTF8.GetBytes(data);
postStream.Write(dataStream, 0, dataStream.Length);
postStream.Close();
//we can then finalize the request...
preq.BeginGetResponse((IAsyncResult final_result) =>
HttpWebRequest req = final_result.AsyncState as HttpWebRequest;
if (req != null)
try
//we call the success callback as long as we get a response stream
WebResponse response = req.EndGetResponse(final_result);
success_callback(response.GetResponseStream());
catch (WebException we)
//otherwise call the error/failure callback
error_callback(we.Message);
return;
}, preq);
}, URL);
private void error_callback(string p)
if (bSignUp)
bSignUp = false;
// Show error message
MessageBox.Show("Connection Error!\n\n" + p);
//enable input
//disable textboxes
TbUN.IsEnabled = true;
TbPW.IsEnabled = true;
TbCPW.IsEnabled = true;
TbEmail.IsEnabled = true;
BtnSignUpSubmit.IsEnabled = false;
title.Text = "try again";
private void success_callback(Stream stream)
if (bSignUp)
bSignUp = false;
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(stream);
// Read the content.
string response = reader.ReadToEnd();
// Display the content.
MessageBox.Show(response);
// Clean up the streams.
reader.Close();
private void BtnGoBack_Tab(object sender, RoutedEventArgs e)
SignIn();
private void TbEmail_Tap(object sender, System.Windows.Input.GestureEventArgs e)
TbEmail.SelectAll();
private void TbCPW_Tap(object sender, System.Windows.Input.GestureEventArgs e)
TbCPW.SelectAll();
private void SignIn_Tab(object sender, RoutedEventArgs e)
if (TbUN.Text.ToString() == "" || TbPW.Text.ToString() == "")
MessageBox.Show("Your Username or Password cannot be empty.\nThank you.");
return;
private void TbUN_Tap(object sender, System.Windows.Input.GestureEventArgs e)
TbUN.SelectAll();
un.Text = "Usernames are Case-Sensitive.\n'Iclips' is not the same as 'iClips'.";
private void TbPW_Tap(object sender, System.Windows.Input.GestureEventArgs e)
TbPW.SelectAll();
protected override void OnNavigatedTo(NavigationEventArgs e)
base.OnNavigatedTo(e);
// Initialize the video recorder.
InitializeVideoRecorder();
CameraButtons.ShutterKeyHalfPressed += OnButtonHalfPress;
// The event is fired when the shutter button receives a full press.
CameraButtons.ShutterKeyPressed += OnButtonFullPress;
// The event is fired when the shutter button is released.
CameraButtons.ShutterKeyReleased += OnButtonRelease;
protected override void OnNavigatedFrom(NavigationEventArgs e)
// Dispose of camera and media objects.
DisposeVideoPlayer();
DisposeVideoRecorder();
base.OnNavigatedFrom(e);
CameraButtons.ShutterKeyHalfPressed -= OnButtonHalfPress;
CameraButtons.ShutterKeyPressed -= OnButtonFullPress;
CameraButtons.ShutterKeyReleased -= OnButtonRelease;
// Ensure that the viewfinder is upright in LandscapeRight.
protected override void OnOrientationChanged(OrientationChangedEventArgs e)
if (vcDevice != null)
if (e.Orientation == PageOrientation.LandscapeLeft)
txtDebug.Text = "LandscapeLeft";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 90 };
//rotate logo
if (logo != null)
RotateTransform rt = new RotateTransform();
rt.Angle = 90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
//rotate sign in link
if (MyGrid != null)
RotateTransform rt = new RotateTransform();
rt.Angle = 90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
if (e.Orientation == PageOrientation.PortraitUp)
txtDebug.Text = "PortraitUp";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 0 };
//rotate logo
if (logo != null)
RotateTransform rt = new RotateTransform();
rt.Angle = 0;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
//rotate sign in link
if (MyGrid != null)
RotateTransform rt = new RotateTransform();
rt.Angle = 0;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
if (e.Orientation == PageOrientation.LandscapeRight)
txtDebug.Text = "LandscapeRight";
// Rotate for LandscapeRight orientation.
//videoRecorderBrush.RelativeTransform =
//new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 180 };
//rotate logo
if (logo != null)
RotateTransform rt = new RotateTransform();
rt.Angle = -90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
logo.RenderTransformOrigin = new Point(0.5, 0.5);
logo.RenderTransform = rt;
//rotate sign in link
if (MyGrid != null)
RotateTransform rt = new RotateTransform();
rt.Angle = -90;
//default rotation is around top left corner of the control,
//but you sometimes want to rotate around the center of the control
//to do that, you need to set the RenderTransFormOrigin
//of the item you're going to rotate
//I did not test this approach, maybe You're going to need to use actual coordinates
//so this bit is for information purposes only
MyGrid.RenderTransformOrigin = new Point(0.5, 0.5);
MyGrid.RenderTransform = rt;
if (e.Orientation == PageOrientation.PortraitDown)
txtDebug.Text = "PortraitDown";
videoRecorderBrush.RelativeTransform =
new CompositeTransform() { CenterX = 0.5, CenterY = 0.5, Rotation = 270 };
// Provide auto-focus with a half button press using the hardware shutter button.
private void OnButtonHalfPress(object sender, EventArgs e)
// Focus when a capture is not in progress.
try
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "Half Button Press: Auto Focus";
catch (Exception focusError)
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = focusError.Message;
// Capture the image with a full button press using the hardware shutter button.
private void OnButtonFullPress(object sender, EventArgs e)
// Focus when a capture is not in progress.
try
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "Full Button Press: Auto Focus";
catch (Exception focusError)
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = focusError.Message;
// Cancel the focus if the half button press is released using the hardware shutter button.
private void OnButtonRelease(object sender, EventArgs e)
try
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "Shutter is released: Auto Focus";
catch (Exception focusError)
// Cannot focus when a capture is in progress.
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = focusError.Message;
// Update the buttons and text on the UI thread based on app state.
private void UpdateUI(ButtonState currentButtonState, string statusMessage)
// Run code on the UI thread.
Dispatcher.BeginInvoke(delegate
switch (currentButtonState)
// When the camera is not supported by the phone.
case ButtonState.CameraNotSupported:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// First launch of the application, so no video is available.
case ButtonState.Initialized:
StartRecording.IsEnabled = true;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// Ready to record, so video is available for viewing.
case ButtonState.Ready:
StartRecording.IsEnabled = true;
StopPlaybackRecording.IsEnabled = false;
StartPlayback.IsEnabled = true;
PausePlayback.IsEnabled = false;
break;
// Video recording is in progress.
case ButtonState.Recording:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = false;
break;
// Video playback is in progress.
case ButtonState.Playback:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = false;
PausePlayback.IsEnabled = true;
break;
// Video playback has been paused.
case ButtonState.Paused:
StartRecording.IsEnabled = false;
StopPlaybackRecording.IsEnabled = true;
StartPlayback.IsEnabled = true;
PausePlayback.IsEnabled = false;
break;
default:
break;
// Display a message.
txtDebug.Text = statusMessage;
// Note the current application state.
currentAppState = currentButtonState;
public void InitializeVideoRecorder()
if (captureSource == null)
// Create the VideoRecorder objects.
captureSource = new CaptureSource();
fileSink = new FileSink();
vcDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
// Add eventhandlers for captureSource.
captureSource.CaptureFailed += new EventHandler<ExceptionRoutedEventArgs>(OnCaptureFailed);
// Initialize the camera if it exists on the phone.
if (vcDevice != null)
// Create the VideoBrush for the viewfinder.
videoRecorderBrush = new VideoBrush();
videoRecorderBrush.SetSource(captureSource);
// Display the viewfinder image on the rectangle.
viewfinderRectangle.Fill = videoRecorderBrush;
// Start video capture and display it on the viewfinder.
captureSource.Start();
// Set the button state and the message.
UpdateUI(ButtonState.Initialized, "Tap record to start recording...");
else
// Disable buttons when the camera is not supported by the phone.
UpdateUI(ButtonState.CameraNotSupported, "A camera is not supported on this phone.");
// Set recording state: start recording.
private void StartVideoRecording()
try
// Connect fileSink to captureSource.
if (captureSource.VideoCaptureDevice != null
&& captureSource.State == CaptureState.Started)
captureSource.Stop();
// Connect the input and output of fileSink.
fileSink.CaptureSource = captureSource;
fileSink.IsolatedStorageFileName = isoVideoFileName;
// Begin recording.
if (captureSource.VideoCaptureDevice != null
&& captureSource.State == CaptureState.Stopped)
captureSource.Start();
// Set the button states and the message.
UpdateUI(ButtonState.Recording, "Recording...");
StartTimer();
// If recording fails, display an error.
catch (Exception e)
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "ERROR: " + e.Message.ToString();
//start the timer
private void StartTimer()
dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Start();
startTime = System.DateTime.Now;
private void StopTimer()
dispatcherTimer.Stop();
private void dispatcherTimer_Tick(object sender, EventArgs e)
System.DateTime now = System.DateTime.Now;
txtRecTime.Text = now.Subtract(startTime).ToString();
// Set the recording state: stop recording.
private void StopVideoRecording()
try
// Stop recording.
if (captureSource.VideoCaptureDevice != null
&& captureSource.State == CaptureState.Started)
captureSource.Stop();
// Disconnect fileSink.
fileSink.CaptureSource = null;
fileSink.IsolatedStorageFileName = null;
// Set the button states and the message.
UpdateUI(ButtonState.Stopped, "Preparing viewfinder...");
StopTimer();
StartVideoPreview();
// If stop fails, display an error.
catch (Exception e)
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "ERROR: " + e.Message.ToString();
// Set the recording state: display the video on the viewfinder.
private void StartVideoPreview()
try
// Display the video on the viewfinder.
if (captureSource.VideoCaptureDevice != null
&& captureSource.State == CaptureState.Stopped)
// Add captureSource to videoBrush.
videoRecorderBrush.SetSource(captureSource);
// Add videoBrush to the visual tree.
viewfinderRectangle.Fill = videoRecorderBrush;
captureSource.Start();
// Set the button states and the message.
UpdateUI(ButtonState.Ready, "Ready to record.");
// If preview fails, display an error.
catch (Exception e)
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "ERROR: " + e.Message.ToString();
// Start the video recording.
private void StartRecording_Click(object sender, EventArgs e)
// Avoid duplicate taps.
StartRecording.IsEnabled = false;
StartVideoRecording();
// Handle stop requests.
private void StopPlaybackRecording_Click(object sender, EventArgs e)
// Avoid duplicate taps.
StopPlaybackRecording.IsEnabled = false;
// Stop during video recording.
if (currentAppState == ButtonState.Recording)
StopVideoRecording();
// Set the button state and the message.
UpdateUI(ButtonState.NoChange, "Recording stopped.");
// Stop during video playback.
else
// Remove playback objects.
DisposeVideoPlayer();
StartVideoPreview();
// Set the button state and the message.
UpdateUI(ButtonState.NoChange, "Playback stopped.");
// Start video playback.
private void StartPlayback_Click(object sender, EventArgs e)
// Avoid duplicate taps.
StartPlayback.IsEnabled = false;
// Start video playback when the file stream exists.
if (isoVideoFile != null)
VideoPlayer.Play();
// Start the video for the first time.
else
// Stop the capture source.
captureSource.Stop();
// Remove VideoBrush from the tree.
viewfinderRectangle.Fill = null;
// Create the file stream and attach it to the MediaElement.
isoVideoFile = new IsolatedStorageFileStream(isoVideoFileName,
FileMode.Open, FileAccess.Read,
IsolatedStorageFile.GetUserStoreForApplication());
VideoPlayer.SetSource(isoVideoFile);
// Add an event handler for the end of playback.
VideoPlayer.MediaEnded += new RoutedEventHandler(VideoPlayerMediaEnded);
// Start video playback.
VideoPlayer.Play();
// Set the button state and the message.
UpdateUI(ButtonState.Playback, "Playback started.");
// Pause video playback.
private void PausePlayback_Click(object sender, EventArgs e)
// Avoid duplicate taps.
PausePlayback.IsEnabled = false;
// If mediaElement exists, pause playback.
if (VideoPlayer != null)
VideoPlayer.Pause();
// Set the button state and the message.
UpdateUI(ButtonState.Paused, "Playback paused.");
private void DisposeVideoPlayer()
if (VideoPlayer != null)
// Stop the VideoPlayer MediaElement.
VideoPlayer.Stop();
// Remove playback objects.
VideoPlayer.Source = null;
isoVideoFile = null;
// Remove the event handler.
VideoPlayer.MediaEnded -= VideoPlayerMediaEnded;
private void DisposeVideoRecorder()
if (captureSource != null)
// Stop captureSource if it is running.
if (captureSource.VideoCaptureDevice != null
&& captureSource.State == CaptureState.Started)
captureSource.Stop();
// Remove the event handler for captureSource.
captureSource.CaptureFailed -= OnCaptureFailed;
// Remove the video recording objects.
captureSource = null;
vcDevice = null;
fileSink = null;
videoRecorderBrush = null;
// If recording fails, display an error message.
private void OnCaptureFailed(object sender, ExceptionRoutedEventArgs e)
this.Dispatcher.BeginInvoke(delegate()
txtDebug.Text = "ERROR: " + e.ErrorException.Message.ToString();
// Display the viewfinder when playback ends.
public void VideoPlayerMediaEnded(object sender, RoutedEventArgs e)
// Remove the playback objects.
DisposeVideoPlayer();
StartVideoPreview();
public void SetScreenResolution()
w = Application.Current.Host.Content.ActualWidth;
h = Application.Current.Host.Content.ActualHeight;
setResViewF(w, h);
public void setResViewF(double width, double height)
viewfinderRectangle.Width = width;
viewfinderRectangle.Height = height;
resMI.Content = "resolution: " + width + "*" + height;
private void resMI_Click(object sender, RoutedEventArgs e)
switch (resMI.Content.ToString())
case "resolution: 176*220":
setResViewF(240, 320);
break;
case "resolution: 240*320":
setResViewF(360, 480);
break;
case "resolution: 360*480":
setResViewF(480, 800);
break;
case "resolution: 480*800":
setResViewF(1440, 720);
break;
case "resolution: 1440*720":
setResViewF(1920, 1080);
break;
case "resolution: 1920*1080":
setResViewF(176, 220);
break;
default:
setResViewF(176, 220);
break;
public void WriteToFile(string key, string value)
var Iso_settings = System.IO.IsolatedStorage.IsolatedStorageSettings.ApplicationSettings;
if (!Iso_settings.Contains(key))
Iso_settings.Add(key, value);
Iso_settings.Save();//This will save your data in isolated storage.
public string ReadFromFile(string key)
var Iso_settings = System.IO.IsolatedStorage.IsolatedStorageSettings.ApplicationSettings;
if (Iso_settings.Contains(key))
return (string)Iso_settings[key];
else
return null;
public DispatcherTimer dispatcherTimer { get; set; }
private void ToggleZoom(MediaElement media)
if (media.Stretch != Stretch.UniformToFill)
// zoom
media.Stretch = Stretch.UniformToFill;
else
// unzoom
media.Stretch = Stretch.Uniform;
BtnSignUpSubmit_Tab is the HyperLinkButton that would trigger the web request process. I need this code to work perfectly because a lot of people will use this. If you can simplify the http web request that already feels so good. Thank you.

How to read and write data from json file from windows phone7 app

Hi
I am developing wp7 app for the use of students my questions are
How can i write a code to read and write the json/text file for the wp7.
I am using windows 7 OS, VS 2010 Edition.
This is my code below:
xaml:
<Grid>
                    <TextBlock Height="45" HorizontalAlignment="Left" Margin="7,18,0,550" Name="textBlock1" Text="Full
Name: " />
                    <TextBox Width="350" Height="70" HorizontalAlignment="Left" Margin="108,1,0,0" Name="txtName"
Text="Enter your full name" VerticalAlignment="Top" />
                    <TextBlock Height="45" HorizontalAlignment="Left" Margin="6,75,0,0" Name="textBlock2" Text="Contact
No: " VerticalAlignment="Top" />
                    <TextBox Width="350" Height="70" HorizontalAlignment="Left" Margin="108,61,0,480" Name="txtContact"
Text="Enter your contact number" MaxLength="10" />
                    <Button Content="Register" Height="72" HorizontalAlignment="Left" Margin="10,330,0,0" Name="btnRegister"
VerticalAlignment="Top" Width="190" Click="btnRegister_Click" />
                </Grid>
xaml.cs:
private void btnRegister_Click(object sender, RoutedEventArgs e)
            string name, contact;
            name = txtName.Text;
            contact = txtContact.Text;
            try
                if (name != "" && contact != "")
                    string msg = name + " " + contact;
                    MessageBox.Show(msg);
                    Student stud = new Student
                        Name= name,
                        Contact = contact,
                    string jsonString = JsonConvert.SerializeObject(stud);
                    MessageBox.Show(jsonString);
                else
                    MessageBox.Show("Input Proper Information", MessageBoxButton.OK);
            catch (Exception ex)
                MessageBox.Show(ex.Message);
I have download NewtonSoft.json version 5.0.8.
So, I am able to convert input data into json format, but how can I able to write and read this data from a json/text file.
How can I do?
Thank you in adv and please, reply soon.

We don't have many samples left for Windows Phone 7 + Azure, the closest one to what you want to do is probably:
Using Local Storage with OData on Windows Phone To Reduce Network Bandwidth
this sample uses the local database feature: 'LINQ to SQL', available to Windows Phone 7.1 and 8.0 Silverlight applications, instead of simple file storage but even if you choose to stick with simple file storage I believe you should be able to adapt the
networking related portions of the sample to your particular application.
Eric Fleck, Windows Store and Windows Phone Developer Support. If you would like to provide feedback or suggestions for future improvements to the Windows Phone SDK please go to http://wpdev.uservoice.com/ where you can post your suggestions and/or cast
your votes for existing suggestions.

Acquiring and plotting data from USB raw

Hi,
I am new to Labview. I have a 3rd party RFID
device which i intend to acquire the frequency waveform from the device
through using Labview. Since as a beginner, i use the spectrum analyser
in the "example" section to start off with and now has error in getting
the correct Visa USB raw to connect my device. The program intiallly
used Visa instrument as the visa resource name but when i changed the
input to the USB raw input there is a class conflict error that says
"You have connected a refnum of one type to a refnum of another type and
both types are members of some class hierarchy, but there is neither a
simple up cast nor type cast between the two classes."
For the
USB raw setting, i have already configured the device using the
NI-driver wizard to install the USB raw and tested it through the MAX.
So now i believe the problem should be wiring of USB raw to the entire
spectrum analyser example. Attached is the spectrum analyzer example.
Really hope to get help on this matter. Thank you.
Attachments:
Template - Spectrum Analyzer Acquire Trace.vi ‏25 KB

The example you posted is based on serial port communication. From your software point view, everything is based on RS232. This is quite common in instrumentation. As RS232 is simple compared to USB. The software driver on your host PC emulate a virtual RS232 port.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

How to acquire and read data before trigger?

Hi, all:
I want to acquire a impluse signal, and the data when the signal begins is very important to me. So, I want to using a digStart trigger to acquire it, but then i'll lose what i want, maybe i can acquire it continuously, and use the trigger to start read the buffer after a delay(in order to wait the signal end), i don't know if there is any ANSI C functions I can use to do it in this way. I am using PCI6220, DAQmx9.02 and ANSI C. If anyone have some info on this please let me know. thinks.

Hi Cris Brown:
From your application,I suggest that you can use DAQmxCfgDigEdgeRefTrig function; define pretrigger samples fitting for your application.
Try it. Best Regard!

How to decode and display jpeg from a bytes stream ?

Hello.
I am new to Flex and got stuck on something that I assume has an easy solution.
I have an RIA application in which I want to display a jpeg image. this image was
sent on a Web Service message, as an array of bytes (I just read the jpeg file as
is and send it to the web application).
I couldn't figure out a way to decode and display this image at the RIA, using an apropriate component. (Image ?)
I have seen a few examples where a jpg is loaded from a web server using a url in
which it's avaliable, but I don't think this is much help to me...
Your help/example apreciated.

Thanks.
I assume you mean passing the bytesArray to Image.load() ?
Anyway, that's what I did and it worked fine.
Now I am facing the same issue with playing sounds, which are available on bytesArray.
I tried to pass the mp3 bytes to the Sound.load(), but it doesn't work, becuase it tries
to cast it to a URL. do you know by any chance whether I can achieve that somehow ?
(I could use prety much any other sound format, if it makes a difference)
Thanks again.

How to read and store data from an SQL resultset

I'm writing a program to create testing scripts. I have a working version of the program that takes data from a specific input file, processes it and then outputs it as a test file that is readable by this other system. That's all fine and dandy, but now I wish to extend my program so that it doesn't need the input file, it shoud run an SQL query on the database itself and output this, with some other data to the output file, I have been experimenting with some code below:
          ResultSet rset;
          rset = sql.sqlweight();
          while (rset.next()!= false)
               System.out.println("I'm getting to this loop");
               scanCode = rset.getString(1);
               System.out.println(scanCode);
               rset.next();
          }And method sqlweight looks like this:
     public static ResultSet sqlweight() throws SQLException
          Connection connectiona = DriverManager.getConnection(//hiding connection details);
          Statement stmtW = connectiona.createStatement();
          String sqlW = "Select distinct (selc_code) from selling_code, prod_orgu_link where selling_code.prod_id = prod_orgu_link.prod_id and prod_orgu_link.prou_prod_handling = 20";
          ResultSet rset = stmtW.executeQuery(sqlW);
          while (rset.next())
               //System.out.println(rset.getString(1));
          //rset.close();
          //stmtW.close();
          //connectiona.close();
          return rset;
     }Code is a bit messy at the moment as I am constantly changing and adding things so excuse the formatting. I can't get it to enter the loop (hence the testing line I put in it). I am wondering what the best way would be to get the data held in the results set into my String variable scanCode. Thanks for any help or advice.

I haven't thrown it away, it just looks like this now:
     public static ResultSet sqlweight() throws SQLException
          Connection connectiona = DriverManager.getConnection(//hiding connection details);
          Statement stmtW = connectiona.createStatement();
          String sqlW = "Select distinct (selc_code) from selling_code, prod_orgu_link where selling_code.prod_id = prod_orgu_link.prod_id and prod_orgu_link.prou_prod_handling = 20";
          ResultSet rset = stmtW.executeQuery(sqlW);
          return rset;
     }

How can i transfer filtered data from diadem to excel?

Hi,
i'm trying to write a script which would allows me to transfer data automatically from diadem to excel and i need some help.
i want to copy the last of my selected channels, open an excel file and paste data into it.
My script look like this
Dim ExcelTable
Call DATABLCLPCOPY("1,137,139,142-168,172-225,227,229,231,233,235,237,239,241,243",j,1) '... CHNNOSTR,CHNROW,VALNO
Set ExcelTable=GetObject("K:\...\Anl_kal_v3_2006.xls!SN1")
ExcelTable.Application.Visible = True
One problem is that i don't know how to continue and the other is that this script only get the programm MS-Excel started and don't open my file.
I hope i explained it the way you could understand and so you could give me ur help.
Thanks
Patrick Etoumann

Hi Patrick,
In DIAdem we provide an example which shows the things you would like to do. The script name is "Expl_OLE.vbs". You find it in the folder ..\Libr\Aut\.
I hope this will help you.
Greetings
Walter

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