python脚本访问winscard.dll

Question

大家好，我正在写一个python脚本来访问windows的winscard.dll。

lib = cdll.LoadLibrary('winscard.dll')
hSC = c_long(0)
lRetval = lib.SCardEstablishContext(0,None,None,pointer(hSC))

上面返回一个值错误，如下所示

Traceback (most recent call last):
  File "C:\Documents and Settings\sbritto\Desktop\OpenSSL\python\test.py", 
  line 17, in <module>
    lRetval = lib.SCardEstablishContext(0,None,None,pointer(hSC))
ValueError: Procedure called with not enough arguments (16 bytes missing) or 
wrong calling convention

这种情况下的值error表示参数是错误的。但我不知道还需要输入什么才能让它工作，我尝试了几种输入组合。

谢谢你们所有人。

Answer 1

您对DLL使用了错误的调用约定：

lib = ctypes.WinDLL("winscard")
handle = ctypes.c_voidp()
lib.SCardEstablishConnection(0, None, None, ctypes.pointer(handle))
# returns 0, all is good
handle
# c_void_p(some address), handle got created

附注:请确保Smart Card服务已启动。否则，您会得到一个隐含的错误代码。