This function closes a volume on a device that has an installable file system.
At a Glance
| Header file: | Fsdmgr.h |
| Windows CE versions: | 2.10 and later |
Syntax
BOOL MyFSD_CloseVolume( PVOLUME pVolume );
Parameters
pVolume
Pointer to the value that the file system driver (FSD) defines in its DLL and passes to the FSDMGR_RegisterVolume function when registering the volume. The definition of pVolume can point to private structures.
Return Values
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.
Remarks
This function is a notification that the specified volume is being unregistered and is implemented in a user defined file system.
The FSD does not need to export this function if it cleans up all associated resources before calling FSDMGR_DeregisterVolume.
All FSD functions can be called reentryly; therefore, FSD developers must take this into account when developing an FSD.
The Fsdmgr component is a dynamic-link library (DLL) that manages all operating system interaction with installable files systems. Each installable file system requires an FSD, which is a DLL that exports an API needed to support an installable file system. The name of the DLL for the FSD and the names of the functions it exports start with the name of the associated installable file system. For example, if the name of file system is MyFSD, then its DLL is MyFSD.dll and its exported functions are prefaced with MyFSD_*.
Fsdmgr provides service functions to FSDs. The FSDMGR_RegisterVolume, FSDMGR_CreateFileHandle, and FSDMGR_CreateSearchHandle functions record a DWORD of volume-specific data the FSD needs to keep associated with volume. This volume-specific data is passed as the first parameter of these three functions.
Applications that access an installable file system use standard Win32 functions. For example, when an application wants to create a folder on a device that contains an installable file system, it calls CreateDirectory. Fsdmgr recognizes that the path is to a device containing an installable file system and calls the appropriate function, which in the case of the MyFSD file system is MyFSD_CreateDirectoryW. That is, the application calls CreateDirectory, causing Fsdmgr to call MyFSD_CreateDirectoryW.
See Also