I'd like to learn how to correctly subclass a QIODevice, and I'm not sure how to interpret some sentences in the Class Reference page:
Before reading this, I thought that seek() was to be called externally (i.e. outside the class/object) to tell the (random-access) device to move its internal pointer.Under pos()
"The current read/write position of the device is maintained internally by QIODevice, so reimplementing this function is not necessary. When subclassing QIODevice, use QIODevice::seek() to notify QIODevice about changes in the device position."
How do I use seek() to "notify QIODevice about changes"? Am I to call seek() internally as well (from member functions), and then use only seek() (and no other technique) to manipulate my internal pointer to the data?
It's not clear to me: The start of which function? The external function that just opened my device?Under seek()
"When subclassing QIODevice, you must call QIODevice::seek() at the start of your function to ensure integrity with QIODevice's built-in buffer."
Thanks in advance for your guidance!
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