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ISCardFileAccess::Read method

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[The Read method is available for use in the operating systems specified in the Requirements section. It is not available for use in Windows Server 2003 with Service Pack 1 (SP1) and later, Windows Vista, Windows Server 2008, and subsequent versions of the operating system. The Smart Card Modules provide similar functionality.]

The Read method reads and returns the specified data from a given file.

Syntax

HRESULT Read(
  [in]  HSCARD_FILE  hFile,
  [in]  LONG         *lBytesToRead,
  [in]  SCARD_FLAGS  flags,
  [out] LPBYTEBUFFER *ppBuffer
);

Parameters

hFile [in]

Handle of the open file to access.

lBytesToRead [in]

Length of data to be read (in) or number of bytes read (out). Returns list of files as an array of BSTRs.

flags [in]

Specifies whether secure messaging should be used.

SC_FL_SECURE_MESSAGING

ppBuffer [out]

An IByteBuffer object containing the read data.

Return value

The method returns one of the following possible values.

Return code Description
S_OK
 Operation completed successfully.
E_INVALIDARG
 Invalid parameter.
E_POINTER
 A bad pointer was passed in.
E_OUTOFMEMORY
 Out of memory.

 

Remarks

For a list of all the methods defined by this interface, see ISCardFileAccess.

In addition to the COM error codes listed above, this interface may return a smart card error code if a smart card function was called to complete the request. For more information, see Smart Card Return Values.

Requirements

Requirement Value
Minimum supported client
 Windows XP [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
End of client support
 Windows XP
End of server support
 Windows Server 2003

See also

ISCardFileAccess