The exception is related to remote files. Although MapViewOfFile works with remote files, it does not keep them coherent. For example, if two computers both map a file as writable, and both change the same page, each computer only sees its own writes to the page. When the data gets updated on the disk, it is not merged. A mapped view of a file is not guaranteed to be coherent with a file that is being accessed by the ReadFile or WriteFile function.
Do not store pointers in the memory mapped file; store offsets from the base of the file mapping so that the mapping can be used at any address. When modifying a file through a mapped view, the last modification timestamp may not be updated automatically.
If required, the caller should use SetFileTime to set the timestamp. If it is not, MapViewOfFile fails. The initial contents of the pages in a file mapping object backed by the paging file are 0 zero. Mapping the file makes the entire mapped virtual address range unavailable to other allocations in the process. After a page from the reserved range is committed, it cannot be freed or decommitted by calling VirtualFree. Reserved and committed pages are released when the view is unmapped and the file mapping object is closed.
When CsvFs is paused this call might fail with an error indicating that there is a lock conflict. For an example, see Creating Named Shared Memory. Creating a File View. Memory Management Functions. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. In order to create another view of a file-mapping object for a different process, use the CreateFileMapping function.
A mapped view of a file is not guaranteed to be coherent with a file being accessed by the ReadFile or WriteFile function. Note To guard against an access violation, use structured exception handling to protect any code that writes to or reads from a memory mapped view. The functionality of a particular platform is determined by the original equipment manufacturer OEM and some devices may not support this API.
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