ISCardTypeConv::CreateByteBuffer method
[The CreateByteBuffer 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 CreateByteBuffer method creates a universal buffer of bytes mapped into an IStream (IByteBuffer) object.
The byte buffer created is a stream mapped over a memory block. To access or manage the buffer, use the methods provided by the IStream interface. A unique feature about this array implementation is that when you call the IStream::Release method, the underlying memory will be released for you.
Syntax
HRESULT CreateByteBuffer(
[in] DWORD dwAllocSize,
[out] LPBYTEBUFFER *ppbyBuff
);
Parameters
-
dwAllocSize [in]
-
Size in bytes of the memory to be allocated for the array.
-
ppbyBuff [out]
-
Pointer to the IStream object to be returned.
Return value
The possible return values are the following:
| Return code | Description |
|---|---|
|
Memory allocated successfully. |
|
There is something wrong with one or more of the parameters passed into the function. |
|
Not enough free memory to satisfy request. |
Remarks
Memory allocated is movable. Use the IStream::Release method to free the memory.
To create a typical C/C++ byte array, call CreateByteArray.
To create an Automation SAFEARRAY of unsigned characters (bytes), call CreateSafeArray.
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 |
| Header |
|
| Type library |
|
| DLL |
|
| IID |
IID_ISCardTypeConv is defined as 53B6AA63-3F56-11D0-916B-00AA00C18068 |
See also