/// <summary>
/// Initializes the NFC Service. Loads the SCM_NFC.dll library,
/// initializes the wrapper and starts listening to NFC event messages.
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
public bool Initialize(IntPtr handle)
{
// Verify that the NFC Wrapper is present
if (LoadLibrary("SCM_NFC.dll") == 0)
{
Debug.WriteLine("NFC Wrapper not found");
Debug.WriteLine("Be sure that the file SCM_NFC.dll is present in the search path.");
return(false);
}
Debug.WriteLine("SCM_NFC.DLL successfully loaded.");
// sets the source and handle for the Win32 process
HwndSource source = HwndSource.FromHwnd(handle);
source.AddHook(new HwndSourceHook(WndProc));
//Init NFC Wrapper
NFCWrapper = new TNFCWrapper();
TNFCWrapper.Initialize((UInt32)handle.ToInt32());
//Tell the NFC Wrapper to start listening for NFC devices or tags
TNFCWrapper.StartListening();
Debug.WriteLine("Please put an NFC Tag on the device");
return(true);
}
private void WriteNFCMessage()
{
// Validate NFCWrapper.
if (NFCWrapper == null)
{
return;
}
UInt32 Result;
//Create Smart Poster NDEF Message
string URI = "http://www.anthonybaker.co";
string Comment = "Anthony Baker's Blog";
string Language = "en-US";
string TargetType = "";
UInt32 Size = 0;
byte Action = 0;
UInt32 NDEFSize = 1000;
byte[] NDEF = new byte[NDEFSize];
Result = TNFCWrapper.CreateNDEFSp(URI, Comment, Language, ref Action, ref Size, TargetType, ref NDEF[0], ref NDEFSize);
Debug.WriteLine("CreateNDEFSp: " + NFCWrapper.NFCWrapperErrorToString(Result));
if (Result != TNFCWrapper.ERR_SUCCESS)
{
return;
}
// print NDEF as Hex dump
PrintHexDump(NDEF, NDEFSize);
// convert NDEF into XML
string XML = "";
Result = NFCWrapper.NDEF2XML(ref NDEF[0], NDEFSize, ref XML);
Debug.WriteLine("NDEF2XML: " + NFCWrapper.NFCWrapperErrorToString(Result));
if (Result != TNFCWrapper.ERR_SUCCESS)
{
return;
}
// print NDEF as XML
Debug.WriteLine(XML);
Debug.WriteLine(" ");
// now write the newly created NDEF message on an NFC tag
Debug.WriteLine("Put an NFC Tag on the reader within the next 5 seconds ...");
TNFCAddress NFCAddress = new TNFCAddress();
TMessageInfo MessageInfo = new TMessageInfo();
Result = TNFCWrapper.WriteNDEF(ref NFCAddress, ref MessageInfo, ref NDEF[0], ref NDEFSize, false, true, 5);
Debug.WriteLine("NDEF2XML: " + NFCWrapper.NFCWrapperErrorToString(Result));
if (Result == TNFCWrapper.ERR_SUCCESS)
{
//Display the message details
string sAddress = "";
for (int i = 0; i < 12; i++)
{
sAddress = sAddress + NFCAddress.Address[i].ToString("X2") + " ";
}
Debug.WriteLine(" Receiver ID = " + sAddress);
Debug.WriteLine(" Receiver Type = " + NFCWrapper.NFCTagTypeToString(MessageInfo.CardType));
Debug.WriteLine(" Device Name = " + MessageInfo.ReaderName);
Debug.WriteLine(" Sent At = " + SystemTimeToString(MessageInfo.TimeStamp));
Debug.WriteLine(" NDEF Size = " + NDEFSize.ToString());
}
else if (Result == TNFCWrapper.ERR_NDEF_TOO_LARGE)
{
// the NDEF message does not fit on the NFC tag
Debug.WriteLine(" Max. NDEF Size = " + NDEFSize.ToString());
}
Debug.WriteLine("");
}
/// <summary>
/// Reads the NFC message data
/// </summary>
/// <returns></returns>
private string ReadNDEF()
{
UInt32 DeviceCount = 0;
UInt32 MessageCount = 0;
UInt32 NextMessageSize = 0;
UInt32 Result;
// check to make sure the NCFWrappr is valid.
if (NFCWrapper == null)
{
return(null);
}
// Get information about the message queue
Result = TNFCWrapper.GetNDEFQueueInfo(ref DeviceCount, ref MessageCount, ref NextMessageSize);
Debug.WriteLine("GetNDEFQueueInfo: " + NFCWrapper.NFCWrapperErrorToString(Result));
// Quit if the queue's information could not be retrieved
if (Result != TNFCWrapper.ERR_SUCCESS)
{
return(null);
}
Debug.WriteLine(" DeviceCount = " + DeviceCount.ToString());
Debug.WriteLine(" MessageCount = " + MessageCount.ToString());
Debug.WriteLine(" NextMessageSize = " + NextMessageSize.ToString());
//Resize the NDEF buffer accordingly to the site of the next message in the queue
byte[] NDEF = new byte[NextMessageSize];
UInt32 NDEFSize = NextMessageSize;
TNFCAddress NFCAddress = new TNFCAddress();
TMessageInfo MessageInfo = new TMessageInfo();
//Read the NDEF message from the message queue
Result = TNFCWrapper.ReadNDEF(ref NFCAddress, ref MessageInfo, ref NDEF[0], ref NDEFSize);
Debug.WriteLine("ReadNDEF: " + NFCWrapper.NFCWrapperErrorToString(Result));
// Quit if the message queue reading was not successful.
if (Result != TNFCWrapper.ERR_SUCCESS)
{
return(null);
}
//Display the message details
string sAddress = "";
for (int i = 0; i < 12; i++)
{
sAddress = sAddress + NFCAddress.Address[i].ToString("X2") + " ";
}
Debug.WriteLine(" Sender ID = " + sAddress);
Debug.WriteLine(" Sender Type = " + NFCWrapper.NFCTagTypeToString(MessageInfo.CardType));
Debug.WriteLine(" Device Name = " + MessageInfo.ReaderName);
Debug.WriteLine(" Received At = " + SystemTimeToString(MessageInfo.TimeStamp));
Debug.WriteLine(" NDEF Size = " + NDEFSize.ToString());
Debug.WriteLine(" ");
// print NDEF as Hex dump
PrintHexDump(NDEF, NDEFSize);
// convert NDEF into XML
string XML = "";
Result = NFCWrapper.NDEF2XML(ref NDEF[0], NDEFSize, ref XML);
Debug.WriteLine("NDEF2XML: " + NFCWrapper.NFCWrapperErrorToString(Result));
// Quit if the message could not be converted to XML
if (Result != TNFCWrapper.ERR_SUCCESS)
{
return(null);
}
// print NDEF as XML
Debug.WriteLine(XML);
Debug.WriteLine(" ");
// Parse XML Message
XDocument xml = XDocument.Parse(XML);
var typeElement = xml.Descendants("Type");
if (typeElement != null)
{
var type = typeElement.First().Value;
XNamespace NDEF_Text = "";
string payload = "No NFC Message Data";
switch (type)
{
case "urn:nfc:wkt:U":
//NDEF_Text = "urn:nfc:wkt:U";
//payload = xml.Descendants(NDEF_Text + "Text").First().Value;
payload = xml.ToString();
return(payload);
case "text/x-vCard":
//NDEF_Text = "text/x-vCard";
//payload = xml.Descendants(NDEF_Text + "Text").First().Value;
payload = xml.ToString();
return(payload);
case "urn:nfc:wkt:T":
//NDEF_Text = "urn:nfc:wkt:T";
//payload = xml.Descendants(NDEF_Text + "Text").First().Value;
payload = xml.ToString();
return(payload);
default:
payload = xml.ToString();
return(payload);
}
}
return(null);
}