(Unicode C++) ScMinidriver - Change Smart Card PIN (or USB token PIN)

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Demonstrates how to change the PIN for a smart card or USB token.

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#include <CkScMinidriverW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkScMinidriverW scmd;

    // Reader names (smart card readers or USB tokens) can be discovered
    // via List Readers or Find Smart Cards
    const wchar_t *readerName = L"Alcor Micro USB Smart Card Reader 0";
    bool success = scmd.AcquireContext(readerName);
    if (success == false) {
        wprintf(L"%s\n",scmd.lastErrorText());
        return;
    }

    // If successful, the name of the currently inserted smart card is available:
    wprintf(L"Card name: %s\n",scmd.cardName());

    // Change the "user" PIN.  (Typically, you'll always be using the "user" PIN.)
    const wchar_t *currentPin = L"0000";
    const wchar_t *newPin = L"1234";
    int retval = scmd.PinChange(L"user",currentPin,newPin);
    if (retval == -1) {
        wprintf(L"The PIN is already blocked.\n");
        return;
    }

    if (retval == -2) {
        wprintf(L"The PinChange function failed for some unanticipated reason\n");
        wprintf(L"%s\n",scmd.lastErrorText());
        return;
    }

    if (retval == 0) {
        wprintf(L"PIN successfully changed.\n");
    }
    else {
        wprintf(L"Current PIN is incorrect.\n");
        wprintf(L"Number of attempts remaining = %d\n",retval);
    }

    scmd.DeleteContext();
    }