To Work With A Memory-mapped File

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A memory-mapped file comprises the contents of a file in virtual memory. This mapping between a file and memory area enables an utility, including a number of processes, to modify the file by reading and writing on to the memory. You should use managed code to access memory-mapped files in the same method that native Windows functions entry memory-mapped information, as described in Managing Memory-Mapped Files. Persisted information are Memory Wave Workshop-mapped recordsdata which can be associated with a source file on a disk. When the final process has finished working with the file, the information is saved to the source file on the disk. These memory-mapped files are suitable for working with extraordinarily massive supply information. Non-persisted recordsdata are memory-mapped files that aren't associated with a file on a disk. When the final process has completed working with the file, the information is lost and the file is reclaimed by garbage assortment. These information are suitable for creating shared memory for inter-process communications (IPC).



Memory-mapped recordsdata could be shared throughout a number of processes. Processes can map to the same memory-mapped file by utilizing a standard name that is assigned by the method that created the file. To work with a memory-mapped file, you will need to create a view of the complete memory-mapped file or a part of it. You can also create a number of views to the same a part of the memory-mapped file, thereby creating concurrent memory. For two views to stay concurrent, they must be created from the same memory-mapped file. Multiple views may even be necessary if the file is higher than the size of the applying's logical memory area out there for memory mapping (2 GB on a 32-bit computer). There are two types of views: stream entry view and random entry view. Use stream access views for sequential entry to a file; this is advisable for non-persisted information and IPC. Random access views are preferred for working with persisted files. Memory-mapped files are accessed via the working system's memory supervisor, so the file is robotically partitioned into various pages and accessed as wanted. You do not should handle the memory administration yourself. The next illustration shows how multiple processes can have a number of and overlapping views to the identical memory-mapped file at the same time. The following table supplies a information for using memory-mapped file objects and their members. You'll be able to specify entry rights for opening an current memory-mapped file by using the OpenExisting strategies that take an MemoryMappedFileRights as a parameter. In addition, you possibly can include a MemoryMappedFileSecurity object that accommodates predefined entry rules. To apply new or changed access rules to a memory-mapped file, use the SetAccessControl methodology. To retrieve access or Memory Wave Workshop audit guidelines from an existing file, use the GetAccessControl methodology.



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