GetTempPath2W function (fileapi.h)

Article
11/20/2024

Retrieves the path of the directory designated for temporary files, based on the privileges of the calling process.

Syntax

DWORD GetTempPath2W(
  [in]  DWORD  BufferLength,
  [out] LPWSTR Buffer
);

Parameters

[in] BufferLength

The size of the string buffer identified by lpBuffer, in TCHARs.

[out] Buffer

A pointer to a string buffer that receives the null-terminated string specifying the temporary file path. The returned string ends with a backslash, for example, "C:\TEMP\".

Return value

If the function succeeds, the return value is the length, in TCHARs, of the string copied to lpBuffer, not including the terminating null character. If the return value is greater than nBufferLength, the return value is the length, in TCHARs, of the buffer required to hold the path.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

The maximum possible return value is MAX_PATH+1 (261).

Remarks

When calling this function from a process running as SYSTEM it will return the path C:\Windows\SystemTemp, which is inaccessible to non-SYSTEM processes. For non-SYSTEM processes, GetTempPath2 will behave the same as GetTempPath.

For non-system processes, the GetTempPath2 function checks for the existence of environment variables in the following order and uses the first path found:

The path specified by the TMP environment variable.
The path specified by the TEMP environment variable.
The path specified by the USERPROFILE environment variable.
The Windows directory.

Note that the function does not verify that the path exists, nor does it test to see if the current process has any kind of access rights to the path. The GetTempPath2 function returns the properly formatted string that specifies the fully qualified path based on the environment variable search order as previously specified. The application should verify the existence of the path and adequate access rights to the path prior to any use for file I/O operations.

Symbolic link behavior: If the path points to a symbolic link, the temp path name maintains any symbolic links.

In Windows 8 and Windows Server 2012, this function is supported by the following technologies.

Technology	Supported
Server Message Block (SMB) 3.0 protocol	Yes
SMB 3.0 Transparent Failover (TFO)	Yes
SMB 3.0 with Scale-out File Shares (SO)	Yes
Cluster Shared Volume File System (CsvFS)	Yes
Resilient File System (ReFS)	Yes

Examples

For an example, see Creating and Using a Temporary File.

Note

The fileapi.h header defines GetTempPath2 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 11 Build 22000
Minimum supported server	Windows Server Build 20348
Header	fileapi.h (include Windows.h)
Library	Kernel32.lib
DLL	Kernel32.dll

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