2017-09-15 92 views
-1

我是新来的.NET,我想确定是否使用winscard的SCardGetStatusChange检测到卡或移除卡。但它返回retcode = -2146435063,当转换为十六进制将给我0x80100009 = SCARD_E_UNKNOWN_READER。我只是根据我的代码pinvoke.netSCardGetStatusChange中的未知阅读器Winscard

这里是我的代码

Public Structure SCARDREADER_STATE 
    Public szReader As String 
    Public pvUserData As IntPtr 
    Public dwCurrentState As Integer 
    Public dwEventState As Integer 
    Public cbAtr As Integer 
    Public rgbAtr() As Byte 
End Structure 

<DllImport(winscarddll, CharSet:=CharSet.Ansi, EntryPoint:="SCardGetStatusChangeA")> 
Public Shared Function SCardGetStatusChange(ByVal hContext As IntPtr, ByVal dwTime As Integer, ByRef rgReaderState As SCARDREADER_STATE(), ByVal cReaders As Integer) As Integer 
End Function 

而且在我的表格样本。

Public Function gAtr(ByVal hContext As IntPtr, ByVal reader As String) As String 
    Dim ret As Integer 
    Dim rs(0) As WinscardFun.SCARDREADER_STATE 
    Console.Write(reader) 
    'ReDim rs(0).rgbAtr(0 To 35) 
    'rs(0).dwEventState = &H0 
    'rs(0).rgbAtr = Nothing 
    'rs(0).cbAtr = 0 
    rs(0).szReader = reader ' "\\\\?PnP?\\Notification" 
    rs(0).dwCurrentState = SCARD_STATE_UNAWARE 

    ret = WinscardFun.SCardGetStatusChange(hContext, 100000000, rs, 1) 
    Console.Write("Ret=" + ret.ToString + vbCrLf) 
    Console.Write("Reader:" + rs(0).szReader + vbCrLf) 
    If ret = 0 And rs(0).cbAtr > 0 And rs(0).rgbAtr IsNot Nothing Then 
     test = "Success" 
    Else 
     test = "Fail" 
    End If 

    Return test 
End Function 

输出是

惩戒= -2146435063 读卡器:ACS ACR1222 3S PICC读卡器PICC 0 故障

+0

你确定你有读卡器安装驱动吗?您是否曾经通过您的计算机上的其他应用程序工具成功使用您的读卡器? –

+0

是的,事实上我成功地使用了scardconnect和scardreaderlist。所以我相信读者工作正常。我只想使用scardgetstatuschange来识别是否检测到卡。你能提供 – Anonymouse24

+0

的结果吗 SCardListReaders –

回答

0

对于未来的研究人员/显影剂。

在SCardGetStatusChange,我只是改变了SCardReaderState()来SCardReader

<DllImport(winscarddll, EntryPoint:="SCardGetStatusChangeA", CharSet:=CharSet.Ansi)> 
Public Shared Function SCardGetStatusChange(ByVal hContext As IntPtr, ByVal dwTime As Integer, ByRef rgReaderState As SCARDREADER_STATE, ByVal cReaders As Integer) As Integer 
End Function 

然后在rgbAtr的初始化加入<MarshalAs(UnmanagedType.ByValArray, SizeConst:=36)>

希望这会有所帮助。