IoGetDriverObjectExtension function (wdm.h)
The IoGetDriverObjectExtension routine retrieves a previously allocated per-driver context area.
Syntax
__drv_aliasesMem PVOID IoGetDriverObjectExtension(
[in] PDRIVER_OBJECT DriverObject,
[in] PVOID ClientIdentificationAddress
);
Parameters
[in] DriverObject
Specifies the driver object with which the context area is associated.
[in] ClientIdentificationAddress
Specifies the unique identifier, provided when it was allocated, of the context area to be retrieved.
Return value
IoGetDriverObjectExtension returns a pointer to the context area, if any or returns NULL.
Remarks
Drivers call IoGetDriverObjectExtension to retrieve a pointer to a previously allocated extension area.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= DISPATCH_LEVEL |