NdisUnmapFile function (ndis.h)
The NdisUnmapFile function releases a virtual address mapping of a file previously set up with the NdisMapFile function.
Syntax
void NdisUnmapFile(
[in] NDIS_HANDLE FileHandle
);
Parameters
[in] FileHandle
The handle that was returned by the NdisOpenFile function.
Return value
None
Remarks
To reduce resource usage, a miniport driver should always call NdisUnmapFile when it no longer needs exclusive access to the contents of a file that it opened. Such a driver can map and unmap the file as necessary, using alternating calls to NdisMapFile and NdisUnmapFile until it releases the file handle with the NdisCloseFile function.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Supported for NDIS 6.0 and NDIS 5.1 drivers (see NdisUnmapFile (NDIS 5.1)) in Windows Vista. Supported for NDIS 5.1 drivers (see NdisUnmapFile (NDIS 5.1)) in Windows XP. |
| Target Platform | Universal |
| Header | ndis.h (include Ndis.h) |
| Library | Ndis.lib |
| IRQL | PASSIVE_LEVEL |
| DDI compliance rules | Irql_Miscellaneous_Function(ndis) |