To Work With A Memory-mapped File
A memory-mapped file incorporates the contents of a file in virtual memory. This mapping between a file and memory house allows an application, MemoryWave Community including multiple processes, to change the file by reading and writing on to the memory. You need to use managed code to access memory-mapped recordsdata in the same means that native Windows capabilities access memory-mapped recordsdata, as described in Managing Memory-Mapped Files. Persisted files are memory-mapped files which might be associated with a source file on a disk. When the last course of has finished working with the file, the information is saved to the source file on the disk. These memory-mapped recordsdata are appropriate for working with extraordinarily giant supply files. Non-persisted files are memory-mapped information that aren't related to a file on a disk. When the final process has completed working with the file, the data is misplaced and the file is reclaimed by rubbish collection. These information are suitable for creating shared memory for inter-course of communications (IPC).
Memory-mapped files will be shared across multiple processes. Processes can map to the same memory-mapped file through the use of a common name that's assigned by the process that created the file. To work with a memory-mapped file, you have to create a view of your entire memory-mapped file or MemoryWave Community a part of it. You too can create a number of views to the identical part of the memory-mapped file, thereby creating concurrent memory. For 2 views to remain concurrent, they have to be created from the identical memory-mapped file. Multiple views might also be obligatory if the file is larger than the dimensions of the applying's logical memory space obtainable for memory mapping (2 GB on a 32-bit laptop). There are two kinds of views: stream entry view and random access view. Use stream access views for sequential access to a file; this is advisable for non-persisted files and IPC. Random access views are most well-liked for working with persisted recordsdata. Memory-mapped information are accessed through the operating system's memory manager, so the file is robotically partitioned into quite a few pages and accessed as wanted. You do not should handle the memory management yourself. The next illustration shows how a number of processes can have a number of and overlapping views to the same 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 access rights for opening an existing memory-mapped file by using the OpenExisting methods that take an MemoryMappedFileRights as a parameter. In addition, you may include a MemoryMappedFileSecurity object that contains predefined entry guidelines. To apply new or modified access rules to a memory-mapped file, use the SetAccessControl method. To retrieve entry or audit guidelines from an existing file, use the GetAccessControl methodology.
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