File operations in QT

1.Qt in IO How to handle the operation
Qt The unified interface simplifies the operation mode of files and external devices
Qt The file in is considered a special external device
Qt The file operation in is the same as that of the external device
2.IO Key function interfaces in operation
Turn on the device ：bool open(OpenMode mode)
Reading data ：QByteArray read(qint64 maxSize)
Write data ：qint64 write(const QByteArray& byteArray)
Turn off the device ：void close()
IO The nature of operation ： Data read / write of continuous storage space
3. Type of device in
Sequential access device ：
Data can only be read and written from the beginning , The read / write location of data cannot be specified
Random access device ：
It can be located at any position for data reading and writing (seek function)

Qt in IO Inheritance hierarchy diagram of equipment ：
QFile yes Qt Class used for file operation in
QFile Object corresponds to a file on the computer
QFileInfo Class used Read file attribute information ：