Memory mapping of QT

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Description of memory mapping

uchar *QFileDevice::map(qint64 offset, qint64 size, QFileDevice::MemoryMapFlags flags = NoOptions)

Copy

     Map the size bytes of the file into memory starting from the offset . should Open a file to make the mapping successful , In other words, the mapping must open a file , But after mapping memory , The file does not need to remain open . When QFile When it is destroyed or a new file is opened with this object , Any unmapped mapping will be automatically unmapped .

     Check the virtual memory size of your computer , Make the virtual memory that can be applied clear .

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