ISCardTypeConv::GetAtIStreamMemory method
[The GetAtIStreamMemory 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 GetAtIStreamMemory method acquires a byte pointer to the HGLOBAL memory block that is managed by the IStream COM interface.
This is a way to get at the memory under the IStream without having to get the sizeof value for the memory block in bytes and read the bytes into a temporary byte array using the IStream interface.
Syntax
HRESULT GetAtIStreamMemory(
[in] LPSTREAM pStrm,
[out] LPBYTEARRAY *ppMem
);
Parameters
-
pStrm [in]
-
A pointer to the IStream COM interface that manages the HGLOBAL memory block.
-
ppMem [out]
-
A pointer to the first byte of the HGLOBAL memory block if successful; else, NULL if operation fails.
Return value
The method returns one of the following possible values.
| Return code | Description |
|---|---|
|
Memory allocated successfully. |
|
There is something wrong with one or more of the parameters passed into the function. |
|
A parameter of pointer type was incorrect. |
|
Not enough free memory to satisfy request. |
Remarks
The IStream reference count will be incremented for each ppMem pointer acquired.
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