ISCardFileAccess::Read method
[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 |
|---|---|
|
Operation completed successfully. |
|
Invalid parameter. |
|
A bad pointer was passed in. |
|
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