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The SCardControl function gives you direct control of the reader by sending specific control codes optionally accompanied with supporting input data.|
__in SCARDHANDLE hCard,
__in DWORD dwControlCode,
__in LPCVOID lpInBuffer,
__in DWORD nInBufferSize,
__out LPVOID lpOutBuffer,
__in DWORD nOutBufferSize,
__out LPDWORD lpBytesReturned
DECLARE LONG SCardControl IN Winscard;
|hCard [in] |
Reference value returned from SCardConnect.
Control code for the operation. This value identifies the specific operation to be performed.
Pointer to a buffer that contains the data required to perform the operation.
Size, in bytes, of the buffer pointed to by lpInBuffer.
Pointer to a buffer that receives the operation"s output data.
Size, in bytes, of the buffer pointed to by lpOutBuffer.
Pointer to a DWORD that receives the size, in bytes, of the data stored into the buffer pointed to by lpOutBuffer.
|Returns SCARD_S_SUCCESS (0) or error code.|
FUNCTION SendCardControlCode(nCtrlCode As Number,;
nRecvLen as Number) As Boolean
LOCAL nResult, cRecvBuff, nRetLen
STORE REPLI(CHR(0), m.nRecvLen) TO cRecvBuff
nResult = SCardControl(THIS.hCard, m.nCtrlCode,;
@cRecvBuff, nRecvLen, @nRetLen)
IF nResult = SCARD_S_SUCCESS
THIS.RecvBuff = SUBSTR(m.cRecvBuff,1,m.nRetLen)
THIS.SetError(m.nResult, "SCardControl failed")
|You can call it any time after a successful call to SCardConnect and before a successful call to SCardDisconnect. The effect on the state of the reader depends on the control code.|
|Word Index links for the SCardControl :|
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Visited in last 7 days: 30
|Created: ||2008-11-20 14:15:28|
|Modified: ||2008-11-20 14:28:50|
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