SHPathPrepareForWriteW function (shlobj_core.h)

Article
02/09/2023

Checks to see if the path exists. This includes remounting mapped network drives, prompting for ejectable media to be reinserted, creating the paths, prompting for the media to be formatted, and providing the appropriate user interfaces, if necessary. Read/write permissions for the medium are not checked.

Syntax

SHSTDAPI SHPathPrepareForWriteW(
  [in, optional] HWND     hwnd,
  [in, optional] IUnknown *punkEnableModless,
  [in]           LPCWSTR  pszPath,
                 DWORD    dwFlags
);

Parameters

[in, optional] hwnd

Type: HWND

A handle to a window that specifies the parent window to be used for any user interface windows that must be created. If set to NULL, user interface windows are not created.

[in, optional] punkEnableModless

Type: IUnknown*

A pointer to an IUnknown interface that specifies the IOleInPlaceActiveObject object that implements the EnableModeless method.

[in] pszPath

Type: LPCTSTR

A pointer to a null-terminated string of maximum length MAX_PATH that specifies the path to be verified as valid for writing. This can be a UNC or file drive path.

dwFlags

Type: DWORD

Flags that determine behavior options. This parameter can be a combination of the following values.

SHPPFW_NONE

Do not create new directories.

SHPPFW_DEFAULT

Default. Do not prompt the user if a directory needs to be created. This is identical to SHPPFW_DIRCREATE. Do not pass with SHPPFW_ASKDIRCREATE.

SHPPFW_DIRCREATE

Create directories without prompting the user. Do not pass with SHPPFW_ASKDIRCREATE.

SHPPFW_ASKDIRCREATE

Prompt the user before creating directories. Do not pass with SHPPFW_DIRCREATE.

SHPPFW_IGNOREFILENAME

Last item in pszPath is a file name, so ignore. For example, if pszPath="C:\MyDir\MyFile.doc", only use "C:\MyDir". If pszPath="C:\MyFirDir\MySecDir", only use "C:\MyFirDir".

SHPPFW_NOWRITECHECK

Not currently implemented.

SHPPFW_MEDIACHECKONLY

Windows XP or later. Suppresses the "not accessible" error message box, which displays when a failure other than a user cancellation occurs, and hwnd is not NULL.

Return value

Type: HRESULT

Returns S_OK if the path is available, or an error code otherwise. Note that a return value of S_OK does not mean that the medium is writable; it simply means that the path is available.

Remarks

The primary use of this function is for a program to check a path before using it and display the necessary user interface to prompt the user. For example, if the disk in drive A: were missing, a window that prompts the user to insert the disk would appear.

Note

The shlobj_core.h header defines SHPathPrepareForWrite as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	shlobj_core.h (include Shlobj.h, Shlobj_core.h)
Library	Shell32.lib
DLL	Shell32.dll (version 5.0 or later)

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