Pyscard未能列出读取器

Question

我有一个ACR38阅读器，我使用Python2.7。我搜索了使用python与读者通信的方法，最后在这里找到了以下代码

import sys
sys.path.append('D:PythonXLibsite-packages')
from smartcard.scard import *
import smartcard.util
SELECT = [0x00, 0xA4, 0x04, 0x00, 0x0A, 0xA0, 0x00, 0x00, 0x00, 0x62,
    0x03, 0x01, 0x0C, 0x06, 0x01]
COMMAND = [0x00, 0x00, 0x00, 0x00]
try:
    hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
    if hresult != SCARD_S_SUCCESS:
        raise Exception('Failed to establish context : ' +
            SCardGetErrorMessage(hresult))
    print 'Context established!'
    try:
        hresult, readers = SCardListReaders(hcontext, [])
        if hresult != SCARD_S_SUCCESS:
            raise Exception('Failed to list readers: ' +
                SCardGetErrorMessage(hresult))
        print 'PCSC Readers:', readers
        if len(readers) < 1:
            raise Exception('No smart card readers')
        reader = readers[0]
        print "Using reader:", reader
        try:
            hresult, hcard, dwActiveProtocol = SCardConnect(hcontext, reader,
                SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1)
            if hresult != SCARD_S_SUCCESS:
                raise Exception('Unable to connect: ' +
                    SCardGetErrorMessage(hresult))
            print 'Connected with active protocol', dwActiveProtocol
            try:
                hresult, response = SCardTransmit(hcard, dwActiveProtocol,
                    SELECT)
                if hresult != SCARD_S_SUCCESS:
                    raise Exception('Failed to transmit: ' +
                        SCardGetErrorMessage(hresult))
                print 'Select: ' + smartcard.util.toHexString(response,
                    smartcard.util.HEX)
                hresult, response = SCardTransmit(hcard, dwActiveProtocol,
                    COMMAND)
                if hresult != SCARD_S_SUCCESS:
                    raise Exception('Failed to transmit: ' +
                        SCardGetErrorMessage(hresult))
                print 'Command: ' + smartcard.util.toHexString(response,
                    smartcard.util.HEX)
            finally:
                hresult = SCardDisconnect(hcard, SCARD_UNPOWER_CARD)
                if hresult != SCARD_S_SUCCESS:
                    raise Exception('Failed to disconnect: ' +
                        SCardGetErrorMessage(hresult))
                print 'Disconnected'
        except Exception, message:
            print "Exception:", message
    finally:
        hresult = SCardReleaseContext(hcontext)
        if hresult != SCARD_S_SUCCESS:
            raise Exception('Failed to release context: ' +
                    SCardGetErrorMessage(hresult))
        print 'Released context.'
except Exception, message:
    print "Exception:", message
import sys
if 'win32' == sys.platform:
    print 'press Enter to continue'
    sys.stdin.read(1)

但当我运行代码时，我收到以下错误：

>>> ================================ RESTART ================================
>>> 
Context established!
Released context.
Exception: Failed to list readers: Cannot find a smart card reader. 
press Enter to continue
Traceback (most recent call last):
  File "C:/Users/ghasemi.IT/Desktop/123", line 76, in <module>
    sys.stdin.read(1)
AttributeError: read
>>> ================================ RESTART ================================

Q： 为什么当我在libusb-win32设备下的设备管理器中有读卡器时，它无法列出读卡器？我应该删除Libusb吗？

Answer 1

您的代码没有看到阅读器的原因是您在这里混合了两种方法：

1. 您的代码尝试使用pyscard，它是PC/SC接口的Python包装器
2. 您让libusb管理ACR38 USB设备

libusb是一个用于直接访问USB设备的库，因此如果您让libusb的USB驱动程序管理读卡器，您还需要使用libusb接口库从程序中访问读卡器。

如果你想使用pyscard（PC/SC），你还需要让PC/SC管理阅读器。在这种情况下，您需要为该读卡器安装一个CCID驱动程序，而不是libusb驱动程序。ACS提供了PC/SC驱动程序包，其中包含该阅读器所需的驱动程序。