Qt after memory mapping, how to read maps in memory of the file?
QFile file (" 11. TXT ");
Double a1, a2, a3, a4.
if(! File. The open (QIODevice: : ReadOnly))
{
Cout<& lt;" Open the Error "& lt; return 0;
}
QTime time;
Time. The start ();
Uchar * FPTR=file. Map (0, the file. The size ());
//how to extract the data extracted from FPTR next
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CodePudding user response:

Pointer offset, can operate
* FPTR=1;
* (FPTR + I)=0;

CodePudding user response:

Principle is to address + shift to obtain the corresponding data, many methods, such as memory copy memcpy after get the data into the corresponding data type