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MyFSD_GetFileAttributesW (Compact 2013)

  • Artigo

3/26/2014

This function returns attributes for a specified file or directory in an installable file system. The application does not call this function directly. Instead, it uses the corresponding standard Win32 function GetFileAttributes. The File System Disk Manager (FSDMGR) determines the file system type and calls the MyFSD_GetFileAttributesW version of the function.

Syntax

DWORD MyFSD_GetFileAttributesW( 
  PVOLUME pVolume,
  PCWSTR pwsFileName
);

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. This parameter can point to private structures.

  • pwsFileName
    [in] Pointer to a null-terminated string that specifies the name of a file or directory.

    The default size limit for paths is MAX_PATH characters. This limit is related to how the GetFileAttributes function parses paths.

Return Value

The attributes of the specified file or directory, returned in a DWORD, indicates success. 0xFFFFFFFF indicates failure. To get extended error information, call GetLastError.

To set an appropriate return code, call SetLastError. For example, to indicate a problem such as an SD card being removed, use SetLastError(ERROR_PATH_NOT_FOUND).

For more information about the file attributes returned, see GetFileAttributes.

Remarks

An FSD exports this function if it supports the GetFileAttributes 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 for an 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, its DLL is MyFSD.dll, and its exported functions are prefaced with MyFSD_*.

FSDMGR provides service functions 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 MyFSD file system is MyFSD_CreateDirectoryW. That is, the application calls CreateDirectory, causing FSDMGR to call **MyFSD_CreateDirectoryW.

Requirements

Header

fsdmgr.h

Library

Fsdmgr.lib

See Also

Reference

MyFSD Functions
CreateDirectory
FSDMGR_CreateFileHandle
FSDMGR_CreateSearchHandle
FSDMGR_RegisterVolume
GetFileAttributes
MyFSD_CreateDirectoryW
MyFSD_SetFileAttributesW