Selecting DF (Dedicated File) in Smart Card, Return Error 6981
问题 I have written a program to communicate with a smart card (Gemalto Company MPCOS applet). I could successfully connect to card and transmit commands and fetch data. However I have a problem: When I used 00 A4 01 00 02 02 00 command to select DF(Dedicated File), It returned error 69 81 (file indicator is incorrect). This is so weird because after this command I used another command to fetch sub-file of this DF and it returned success 61 12 . command1(Select MPCOS Applet): 00 A4 04 00 10 A0 00