private async void BtnWriteImageTo_Click(object sender, RoutedEventArgs e)
{
// Load an image
// Note: Use supplied demo images from /Assets/DemoImages (copy these to the device)
// Normal photos will most likely be too large for NFC tags.
var openPicker = new Windows.Storage.Pickers.FileOpenPicker
{
SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary,
ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail
};
// Filter to include a sample subset of file types.
openPicker.FileTypeFilter.Clear();
openPicker.FileTypeFilter.Add(".bmp");
openPicker.FileTypeFilter.Add(".png");
openPicker.FileTypeFilter.Add(".gif");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".jpg");
// Open the file picker.
var file = await openPicker.PickSingleFileAsync();
// file is null if user cancels the file picker.
if (file != null)
{
var record = await NdefMimeImageRecord.CreateFromFile(file);
// Publish the record using the proximity device
PublishRecord(record, true);
}
}
private async Task ParseTagContents(NdefMessage ndefMessage, StringBuilder tagContents)
{
// Loop over all records contained in the NDEF message
foreach (NdefRecord record in ndefMessage)
{
// --------------------------------------------------------------------------
// Print generic information about the record
if (record.Id != null && record.Id.Length > 0)
{
// Record ID (if present)
tagContents.AppendFormat("Id: {0}\n", Encoding.UTF8.GetString(record.Id, 0, record.Id.Length));
}
// Record type name, as human readable string
tagContents.AppendFormat("Type name: {0}\n", ConvertTypeNameFormatToString(record.TypeNameFormat));
// Record type
if (record.Type != null && record.Type.Length > 0)
{
tagContents.AppendFormat("Record type: {0}\n",
Encoding.UTF8.GetString(record.Type, 0, record.Type.Length));
}
// --------------------------------------------------------------------------
// Check the type of each record
// Using 'true' as parameter for CheckSpecializedType() also checks for sub-types of records,
// e.g., it will return the SMS record type if a URI record starts with "sms:"
// If using 'false', a URI record will always be returned as Uri record and its contents won't be further analyzed
// Currently recognized sub-types are: SMS, Mailto, Tel, Nokia Accessories, NearSpeak, WpSettings
var specializedType = record.CheckSpecializedType(true);
if (specializedType == typeof(NdefMailtoRecord))
{
// --------------------------------------------------------------------------
// Convert and extract Mailto record info
var mailtoRecord = new NdefMailtoRecord(record);
tagContents.Append("-> Mailto record\n");
tagContents.AppendFormat("Address: {0}\n", mailtoRecord.Address);
tagContents.AppendFormat("Subject: {0}\n", mailtoRecord.Subject);
tagContents.AppendFormat("Body: {0}\n", mailtoRecord.Body);
}
else if (specializedType == typeof(NdefUriRecord))
{
// --------------------------------------------------------------------------
// Convert and extract URI record info
var uriRecord = new NdefUriRecord(record);
tagContents.Append("-> URI record\n");
tagContents.AppendFormat("URI: {0}\n", uriRecord.Uri);
}
else if (specializedType == typeof(NdefSpRecord))
{
// --------------------------------------------------------------------------
// Convert and extract Smart Poster info
var spRecord = new NdefSpRecord(record);
tagContents.Append("-> Smart Poster record\n");
tagContents.AppendFormat("URI: {0}", spRecord.Uri);
tagContents.AppendFormat("Titles: {0}", spRecord.TitleCount());
if (spRecord.TitleCount() > 1)
{
tagContents.AppendFormat("1. Title: {0}", spRecord.Titles[0].Text);
}
tagContents.AppendFormat("Action set: {0}", spRecord.ActionInUse());
// You can also check the action (if in use by the record),
// mime type and size of the linked content.
}
else if (specializedType == typeof(NdefVcardRecordBase))
{
// --------------------------------------------------------------------------
// Convert and extract business card info
var vcardRecord = new NdefVcardRecord(record);
tagContents.Append("-> Business Card record" + Environment.NewLine);
var contact = vcardRecord.ContactData;
// Contact has phone or email info set? Use contact manager to show the contact card
await _dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
if (contact.Emails.Any() || contact.Phones.Any())
{
var rect = GetElementRect(StatusOutput);
ContactManager.ShowContactCard(contact, rect, Placement.Below);
}
else
{
// No phone or email set - contact manager would not show the contact card.
// -> parse manually
tagContents.AppendFormat("Name: {0}\n", contact.DisplayName);
tagContents.Append("[not parsing other values in the demo app]");
}
});
}
else if (specializedType == typeof(NdefLaunchAppRecord))
{
// --------------------------------------------------------------------------
// Convert and extract LaunchApp record info
var launchAppRecord = new NdefLaunchAppRecord(record);
tagContents.Append("-> LaunchApp record" + Environment.NewLine);
if (!string.IsNullOrEmpty(launchAppRecord.Arguments))
{
tagContents.AppendFormat("Arguments: {0}\n", launchAppRecord.Arguments);
}
if (launchAppRecord.PlatformIds != null)
{
foreach (var platformIdTuple in launchAppRecord.PlatformIds)
{
if (platformIdTuple.Key != null)
{
tagContents.AppendFormat("Platform: {0}\n", platformIdTuple.Key);
}
if (platformIdTuple.Value != null)
{
tagContents.AppendFormat("App ID: {0}\n", platformIdTuple.Value);
}
}
}
}
else if (specializedType == typeof(NdefMimeImageRecordBase))
{
// --------------------------------------------------------------------------
// Convert and extract Image record info
var imgRecord = new NdefMimeImageRecord(record);
tagContents.Append("-> MIME / Image record" + Environment.NewLine);
_dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() => SetStatusImage(await imgRecord.GetImageAsBitmap()));
}
else
{
// Other type, not handled by this demo
tagContents.Append("NDEF record not parsed by this demo app" + Environment.NewLine);
}
}
}
