this is my first time trying to code RFID readers.
I have the code below which when I click a button reads the cards ID, Id like to get the code to constantly read until someone places a card on the reader then do something depending on what card is placed upon it.
private void btnRequest_Click(object sender, EventArgs e)
{
txtSearchPurse.Text = "";
short icdev = 0x0000;
int status;
byte type = (byte)'A';//mifare one type is A 卡询卡方式为A
byte mode = 0x26; // Request the card which is not halted.
ushort TagType = 0;
byte bcnt = 0x04;//mifare 卡都用4, hold on 4
IntPtr pSnr;
byte len = 255;
sbyte size = 0;
if (!bConnectedDevice)
{
MessageBox.Show("Not connect to device!!", "error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
pSnr = Marshal.AllocHGlobal(1024);
for (int i = 0; i < 2 ;i++ )
{
status = rf_request(icdev, mode, ref TagType);//搜寻没有休眠的卡,request card
if (status != 0)
continue;
status = rf_anticoll(icdev, bcnt, pSnr, ref len);//防冲突得到返回卡的序列号, anticol--get the card sn
if (status != 0)
continue;
status = rf_select(icdev, pSnr, len, ref size);//锁定一张ISO14443-3 TYPE_A 卡, select one card
if (status != 0)
continue;
byte[] szBytes = new byte[len];
for (int j = 0; j < len; j++)
{
szBytes[j] = Marshal.ReadByte(pSnr, j);
}
String m_cardNo = String.Empty;
for (int q = 0; q < len; q++)
{
m_cardNo += byteHEX(szBytes[q]);
}
txtSearchPurse.Text = m_cardNo;
break;
}
Marshal.FreeHGlobal(pSnr);
}
This Code has come from the manufacturer and I hace very little knowolage of what its actually doing.
Any info would be good.
Something like this? It places the cardreading code on a thread with an interval of 1 sec. As soon as card is read your code is called and you can proces the card. Just an example to get you started, there's a lot to improve.
class CardReader : IDisposable
{
IntPtr _pSnr = Marshal.AllocHGlobal(1024);
private Thread _t;
private Action<string> _callback;
private volatile bool _stop;
public void ReadCard()
{
short icdev = 0x0000;
int status;
byte type = (byte)'A';//mifare one type is A 卡询卡方式为A
byte mode = 0x26; // Request the card which is not halted.
ushort TagType = 0;
byte bcnt = 0x04;//mifare 卡都用4, hold on 4
IntPtr pSnr;
byte len = 255;
sbyte size = 0;
for (int i = 0; i < 2; i++) {
status = rf_request(icdev, mode, ref TagType);//搜寻没有休眠的卡,request card
if (status != 0)
continue;
status = rf_anticoll(icdev, bcnt, pSnr, ref len);//防冲突得到返回卡的序列号, anticol--get the card sn
if (status != 0)
continue;
status = rf_select(icdev, pSnr, len, ref size);//锁定一张ISO14443-3 TYPE_A 卡, select one card
if (status != 0)
continue;
byte[] szBytes = new byte[len];
for (int j = 0; j < len; j++) {
szBytes[j] = Marshal.ReadByte(pSnr, j);
}
String m_cardNo = String.Empty;
for (int q = 0; q < len; q++) {
m_cardNo += byteHEX(szBytes[q]);
}
_callback(m_cardNo);
break;
}
}
public void Work()
{
while (!_stop)
{
ReadCard();
Thread.Sleep(1000);
}
}
public void Start(Action<string> cardRead)
{
if (_t != null)
return;
_stop = false;
_callback = cardRead;
_t = new Thread(Work);
_t.Start();
}
public void Stop()
{
if (_t != null)
{
_stop = true;
_t.Join();
_t = null;
}
}
public void Dispose()
{
Marshal.FreeHGlobal(_pSnr);
}
}
Usage:
var reader = new CardReader();
reader.Start(CardReaded);
private void CardReaded(string cardnr){
...
}
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