Windows Mobile 6.5
A version of this page is also available for

This function unmaps a mapped view of a file from the address space of the calling process.

BOOL UnmapViewOfFile( 
  LPCVOID lpBaseAddress 


[in] Pointer to the base address of the mapped view of a file to be unmapped. This value must be identical to the value returned by a previous call to the MapViewOfFile function.

Nonzero indicates success. All dirty pages within the specified range are written lazily to disk. Zero indicates failure. To get extended error information, call GetLastError.

Although an application can 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 Embedded CEWindows CE 1.01 and later
Windows MobileWindows Mobile Version 5.0 and later

Community Additions