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我在使用NFC卡的java程序中使用ACR122U NFC閱讀器。但是,默認情況下,讀卡器在讀卡時發出嗡嗡聲。我試圖通過NFC閱讀器文檔(在這裏找到:http://www.acs.com.hk/download-manual/419/API-ACR122U-2.03.pdf)顯示您可以關閉蜂鳴器而失敗。但是我無法爲它寫一個java方法。正如你所看到的,我的班級已經有了與NFC閱讀器進行通信的方法。但是我無法將文檔中顯示的命令轉換爲java方法。關閉Java閱讀器(NFC ACR122U)上的蜂鳴器
NFCcard類:
package dataStores;
import java.util.List;
import javax.smartcardio.Card;
import javax.smartcardio.CardChannel;
import javax.smartcardio.CardException;
import javax.smartcardio.CardTerminal;
import javax.smartcardio.CommandAPDU;
import javax.smartcardio.ResponseAPDU;
import javax.smartcardio.TerminalFactory;
public class NFCcard {
private TerminalFactory factory;
private List<CardTerminal> terminals;
private CardTerminal terminal;
private Card card ;
public CardChannel cardChannel;
public NFCcard() throws CardException {
factory = TerminalFactory.getDefault();
terminals = factory.terminals().list();
terminal = terminals.get(0);
card = terminal.connect("*");
cardChannel = card.getBasicChannel();
cardChannel.transmit(new CommandAPDU(new byte[] { (byte)0xE0, (byte)0x00, (byte)0x00, (byte)0x21, (byte)0x01,(byte)0x77 }));
}
public String getCardID() throws CardException{
String cardID = "";
ResponseAPDU answer=cardChannel.transmit(new CommandAPDU(new byte[] { (byte)0xFF, (byte)0xCA, (byte)0x00, (byte)0x00, (byte)0x00 }));
byte r[] = answer.getData();
for (int i=0; i<r.length; i++)
cardID+=r[i];
return cardID;
}
}
當你想關掉它?當檢測到卡時? –
當掃描卡時它只會發出蜂鳴聲。 – user2370794
你的意思是儘快檢測到? –