GetMappedFileNameW function (psapi.h)

Article
02/09/2023

Checks whether the specified address is within a memory-mapped file in the address space of the specified process. If so, the function returns the name of the memory-mapped file.

Syntax

DWORD GetMappedFileNameW(
  [in]  HANDLE hProcess,
  [in]  LPVOID lpv,
  [out] LPWSTR lpFilename,
  [in]  DWORD  nSize
);

Parameters

[in] hProcess

A handle to the process. The handle must have the PROCESS_QUERY_INFORMATION access rightF. For more information, see Process Security and Access Rights.

[in] lpv

The address to be verified.

[out] lpFilename

A pointer to the buffer that receives the name of the memory-mapped file to which the address specified by lpv belongs.

[in] nSize

The size of the lpFilename buffer, in characters.

Return value

If the function succeeds, the return value specifies the length of the string copied to the buffer, in characters.

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

Remarks

Starting with Windows 7 and Windows Server 2008 R2, Psapi.h establishes version numbers for the PSAPI functions. The PSAPI version number affects the name used to call the function and the library that a program must load.

If PSAPI_VERSION is 2 or greater, this function is defined as K32GetMappedFileName in Psapi.h and exported in Kernel32.lib and Kernel32.dll. If PSAPI_VERSION is 1, this function is defined as GetMappedFileName in Psapi.h and exported in Psapi.lib and Psapi.dll as a wrapper that calls K32GetMappedFileName.

Programs that must run on earlier versions of Windows as well as Windows 7 and later versions should always call this function as GetMappedFileName. To ensure correct resolution of symbols, add Psapi.lib to the TARGETLIBS macro and compile the program with -DPSAPI_VERSION=1. To use run-time dynamic linking, load Psapi.dll.

In 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 Obtaining a File Name From a File Handle.

Note

The psapi.h header defines GetMappedFileName as an alias which 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 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 XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	psapi.h
Library	Kernel32.lib on Windows 7 and Windows Server 2008 R2; Psapi.lib (if PSAPI_VERSION=1) on Windows 7 and Windows Server 2008 R2; Psapi.lib on Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP
DLL	Kernel32.dll on Windows 7 and Windows Server 2008 R2; Psapi.dll (if PSAPI_VERSION=1) on Windows 7 and Windows Server 2008 R2; Psapi.dll on Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP

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