A bit of binary I/O

[Heinz]

Frank Benoit (keinfarbton) Wrote:

> > // Primitive
> > 09 00 00 00 00 00 00 00 0B 00 00 00 A0 C7 41 00
> 
> 09 00 00 00 00 00 00 00 // the ulong with value 9
> 0B 00 00 00             // arraysize 11
> A0 C7 41 00             // pointervalue to the start of data
> 
> > // Structure
> > 09 00 00 00 00 00 00 00 0B 00 00 00 A0 C7 41 00
> 
> same here
> 
> > // Class
> > C0 3F 91 00
> 
> the first 4 bytes of your class. mtt.sizeof is the size of the reference
> not the size of the object itself.
> 
> s.ptr is the pointer to the array data.
> &s is the address of the struct, that holds the array length and the
> pointer to the data.
> To write the string, you might want to try this:
> 	myFile.writeExact( s.ptr, s.length );
> 

I get it, but if i'm actually writing the address of my data and not the data itself then why i'm able to retrieve the data even if it's not there?