c++ - SCardTransmit returns error 0x000005aa -


i trying connect , send command smart card through windows smart card api , below code have msdn. here scardtransmit function returns me 0x000005aa , can 1 let me know doing wrong.

int _tmain(int argc, _tchar* argv[]) { scardcontext    hcontext; long            lreturn; scardhandle     hcardhandle; dword           dwap; const dword buf_len = 512; dword dwrecv; byte pbrecv[buf_len];  byte sendcommand[]={0x00,0x0a4,0x00,0x00,0x02,0x3f,0x00};  lreturn = scardestablishcontext(scard_scope_user, null,null,&hcontext); if ( scard_s_success != lreturn ) {     printf("failed scardestablishcontext\n");     scardreleasecontext(hcontext);     return 0; }  lreturn = scardconnect( hcontext, "omnikey cardman 3x21 0",     scard_share_shared, scard_protocol_t0 | scard_protocol_t1,     &hcardhandle, &dwap ); if ( scard_s_success != lreturn ) {     printf("failed scardconnect\n");     scardreleasecontext(hcontext);     return 0; }  switch ( dwap ) { case scard_protocol_t0:     printf("active protocol t0\n");      break;  case scard_protocol_t1:     printf("active protocol t1\n");      break;  case scard_protocol_undefined: default:     printf("active protocol unnegotiated or unknown\n");      break; }  lreturn = scardtransmit(hcardhandle,scard_pci_t0,sendcommand,7,     null,pbrecv,&dwrecv ); if ( scard_s_success != lreturn ) {     printf("failed scardtransmit\n");    } lreturn = scardreleasecontext(hcontext); return 0;  }

as suggested in comments retired ninja. variable dwrecv needs initialize, after initializing variable program works. thanks.


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