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donwmufromdying 2022-11-15
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QFile 打开，然后映射。下边是官方技术文档
uchar *QFileDevice::map(qint64 offset, qint64 size, QFileDevice::MemoryMapFlags flags = NoOptions)
Maps size bytes of the file into memory starting at offset. A file should be open for a map to succeed but the file does not need to stay open after the memory has been mapped. When the QFile is destroyed or a new file is opened with this object, any maps that have not been unmapped will automatically be unmapped.
The mapping will have the same open mode as the file (read and/or write), except when using MapPrivateOption, in which case it is always possible to write to the mapped memory.
Any mapping options can be passed through flags.
Returns a pointer to the memory or nullptr if there is an error.
See also unmap().
