This callback can be used for monitoring file transfers.
It is called during file transfers started by the GetFile or PutFile methods. It
will be called several times, depending on numerous factors, including network
speed, buffer size and file size. There is no default rule governing the exact number of
times it will be fired.
Once a transfer has finished, the Position argument will have the same value as the
Total argument. Also, once
a file transfer has finished the Done callback will be
called.
NOTE: this callback is called only if
you have created instance of SftpEventsStruct structure, and set up its Progress member to function
implementing it.
