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MyFSD_SetFileAttributesW (Compact 2013)

  • Artigo

3/26/2014

This function sets the attributes of a file in an installable file system. The application does not call this function directly. Instead, it uses the corresponding standard Win32 function SetFileAttributes. The File System Disk Manager (FSDMGR) determines the file system type and calls the MyFSD_SetFileAttributesW implementation of the function.

Syntax

BOOL MyFSD_SetFileAttributesW( 
  PVOLUME pVolume,
  PCWSTR pwsFileName, 
  DWORD dwFileAttributes
);

Parameters

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

  • pwsFileName
    [in] Pointer to a string that specifies the name of the file whose attributes are to be set.

    This string must not exceed MAX_PATH characters.

  • dwFileAttributes
    [in] File attributes to set for the file. This parameter can be a combination of values. However, all other values override FILE_ATTRIBUTE_NORMAL. The following table shows possible values.

    Value

    Description

    FILE_ATTRIBUTE_ARCHIVE

    Indicates that the file is an archive file. Applications use this attribute to mark files for backup or removal.

    FILE_ATTRIBUTE_HIDDEN

    Indicates that the file is hidden. It is not included in an ordinary directory listing.

    FILE_ATTRIBUTE_NORMAL

    Indicates that the file has no other attributes set. This attribute is valid only if used alone.

    FILE_ATTRIBUTE_READONLY

    Indicates that the file is read-only. Applications can read the file, but cannot write to it or delete it.

    FILE_ATTRIBUTE_SYSTEM

    Indicates that the file is part of the OS or is used exclusively by it.

    FILE_ATTRIBUTE_TEMPORARY

    Indicates that the file is being used for temporary storage File systems attempt to keep all of the data in memory for quicker access, rather than flushing the data back to mass storage. A temporary file is deleted by the application as soon as it is no longer needed.

Return Value

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Remarks

An FSD exports this function if it supports the SetFileAttributes function. 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 a 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 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.

A file system must mask off any file attributes that it does not suppor in this function and MyFSD_CreateFileW.

The following table shows how to set the attributes that cannot be set using SetFileAttributes.

Attribute

Description

FILE_ATTRIBUTE_COMPRESSED

To set a file's compression state, use the DeviceIoControl function with the FSCTL_SET_COMPRESSION operation.

FILE_ATTRIBUTE_DIRECTORY

Files cannot be converted into directories. To create a directory, use CreateDirectory.

FILE_ATTRIBUTE_ENCRYPTED

To encrypt a file, use EncryptFile.

FILE_ATTRIBUTE_REPARSE_POINT

To associate a reparse point with a file, use DeviceIoControl with the FSCTL_SET_REPARSE_POINT operation.

FILE_ATTRIBUTE_SPARSE_FILE

To set a file's sparse attribute, use DeviceIoControl with the FSCTL_SET_SPARSE operation.

FILE_ATTRIBUTE_SYSTEM

This attribute cannot be set.

Requirements

Header

fsdmgr.h

Library

Fsdmgr.lib

See Also

Reference

MyFSD Functions
CreateDirectory
FSDMGR_CreateFileHandle
FSDMGR_CreateSearchHandle
FSDMGR_RegisterVolume
MyFSD_GetFileAttributesW
SetFileAttributes

Other Resources

DeviceIoControl