2010/8/31 Brian Li <[email protected]>:
> Try the pcsclite under ubuntu.

What version of pcsc-lite?
What version of Ubuntu?
Please, follow [1] when requesting help.

> The function SCardConnect executed successful, and the reader's led is light.
> But when call SCardDisconnect(mHandle,SCARD_UNPOWER_CARD), the function 
> returned error,

Maybe the error code returned by SCardDisconnect() is important?
Maybe you should tell us what is this error code?

> and the led light isn't extinguished either, changed the 2nd parameter to 
> SCARD_EJECT_CARD, the function returned OK, but the light still didn't 
> extinguished.

What is "returned OK"?

> My reader is USB GemPC Twin;

Good.

Bye

[1] http://pcsclite.alioth.debian.org/ccid.html#support

-- 
 Dr. Ludovic Rousseau

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