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UnmapViewOfFile.md

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Function name : UnmapViewOfFile

Group: File Mapping - Library: kernel32

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

Code examples:

Using File Mapping for enumerating files opened by Visual FoxPro
Using shared memory to exchange data between applications (processes)

Declaration:

BOOL UnmapViewOfFile(
  LPCVOID lpBaseAddress
);

FoxPro declaration:

DECLARE INTEGER UnmapViewOfFile IN kernel32;
	LONG lpBaseAddress

Parameters:

lpBaseAddress [in] Pointer to the base address of the mapped view of a file that is to be unmapped.

Return value:

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

Comments:

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.

See also: MapViewOfFile, MapViewOfFileEx.