Hi,
Currently I am facing problem regarding the Smart Card transmit function
I am programming using winscard.dll in VB.
I am able to perform the operations like ScardConnect, ScardEstablishContext, ScardListReaders successfully
But when I am Transmitting bytes(APDU) to the reader, I am getting return bytes 6D 00 as status bytes (Sw1, sw2) as opposed to 90 00
I am using Reader: Gemplus PC 410-SL on Windows 2000 Professional

Please guide me on following Sample Code snippet regarding, where am lacking.

Function: SCardTransmit

Dim byReadBuffer As BytArray
Dim bytCommand As BytArray

bytCommand.byBytes(0) = &H0
bytCommand.byBytes(1) = &HA4
bytCommand.byBytes(2) = &H1
bytCommand.byBytes(3) = &H0
bytCommand.byBytes(4) = &H5

Dim leng As Long

leng = 255
lResult = SCardTransmit(hCard, 0, bytCommand, 7, 0, byReadBuffer, leng)

If lResult <> SCARD_S_SUCCESS Then ' It returns Success
MsgBox "Select File Failed", vbInformation
Exit Sub
End If

szMessage = "MessageRead: " + DecimalToString(byReadBuffer, leng, True)
Message.Text = szMessage ' Gives status bytes as 6D 00

Regards ,
Sunita

Hi Sunita

After i checked your program i think you have a error in your apdu exchange protocol, what i meen is the result can´t foud your CLAss parameter.
Please access this link and see the error http://smartcard.caret.cam.ac.uk/MFC-APDU.html
check this and send me your results.
Best regards

I am programming Smart Card by using winscard.dll in VB. I know for the dBForums that you know how to perform the operations like ScardConnect, ScardEstablishContext, ScardListReaders. Could you please send some code for my reference?