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MyFSD_Notify (Windows Embedded CE 6.0)

  • Статья

1/6/2010

This function, an event notification handler, is called by the application to notify a file system driver (FSD) on a per-volume basis.

Syntax

void MyFSD_Notify( 
  PVOLUME pVolume, 
  DWORD dwFlags
);

Parameters

  • pVolume
    [in] Pointer to the value that an FSD defines and passes to the FSDMGR_RegisterVolume function when registering the volume. The definition of this parameter can point to private structures.

  • dwFlags
    [in] Event. The following table shows possible values.

    Flag Description

    FSNOTIFY_DEVICES_ON

    Indicates that that the device has resumed after a suspended mode, and the PC card devices are now available for use.

    FSNOTIFY_POWER_OFF

    Indicates that the device is entering a suspended state. No system calls can be made at this point, and FSDMGR calls the application on a single thread.

    FSNOTIFY_POWER_ON

    Indicates that the device has resumed operations from a suspended mode. FSDMGR calls the application on a single thread. Therefore, the application returns quickly, and other file systems can resume.

Return Value

None.

Remarks

All FSD functions can be called on re-entry. Therefore, take this into account when developing an FSD.

FSDMGR is a DLL that manages all OS interaction with installable files systems. Each installable file system requires an FSD, which is a DLL that supports an installable file system. The name of the DLL 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, its DLL is MyFSD.dll, and its exported functions are prefaced with MyFSD_*.

FSDMGR provides services to FSDs. The FSDMGR_RegisterVolume, the FSDMGR_CreateFileHandle, and the FSDMGR_CreateSearchHandle functions record a DWORD of volume-specific data that an FSD associates with avolume. 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 creates a folder on a device that contains an installable file system, it calls the CreateDirectory function. 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 FAT file system is FATFSD_CreateDirectoryW. That is, the application calls CreateDirectory, causing FSDMGR to call FATFSD_CreateDirectoryW.

Requirements

Header fsdmgr.h
Library Fsdmgr.lib
Windows Embedded CE Windows CE 2.10 and later

See Also

Reference

MyFSD Functions
CreateDirectory
FSDMGR_CreateFileHandle
FSDMGR_CreateSearchHandle
FSDMGR_RegisterVolume