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UnmapViewOfFile info  Overview  Group

The UnmapViewOfFile function unmaps a mapped view of a file from the calling process’s address space.

BOOL UnmapViewOfFile(

    LPCVOID lpBaseAddress 

// address where mapped view begins



Points to the base address of the mapped view of a file that is to be unmapped. This value must be identical to the value returned by a previous call to the MapViewOfFile or MapViewOfFileEx function.

Return Values

If the function succeeds, the return value is nonzero, and all dirty pages within the specified range are written “lazily” to disk.

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


Although an application may close the file handle used to create a file mapping object, the system holds the corresponding file open until the last view of the file is unmapped.

Windows 95: Files for which the last view has not yet been unmapped are held open with the same sharing restrictions as the original file handle.

Windows NT: Files for which the last view has not yet been unmapped are held open with no sharing restrictions.

See Also

MapViewOfFile, MapViewOfFileEx

file: /Techref/os/win/api/win32/func/src/f89_14.htm, 2KB, , updated: 2000/4/7 12:19, local time: 2024/6/16 21:55,

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