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Re: How to load only header of the file with LoadFromFile? [message #19745 is a reply to message #19741]

Fri, 09 January 2009 19:22

White_Owl
Messages: 27
Registered: January 2009
Location: New York

Promising Member

luzr wrote on Thu, 08 January 2009 23:05

If you want to use Serialize, you can still dividide it to Header and Data sections

Are you suggesting to divide my data class to header and actual_data classes?
That can work, but I do not like this idea, because for all other purposes one big class would be better than two separate.

luzr wrote on Thu, 08 January 2009 23:05

- you only cannot use LoadFromFile because it adds some magic values around the data.

Well, I generate these files myself so it should not be a problem...

luzr wrote on Thu, 08 January 2009 23:05

But you can call Serialize directly

Something like this?

class MyData {
   void Serialize_Header(Stream &s) {
      s % data_description;
   }
   void Serialize_Data(Stream &s) {
      s % data1 % data2 % data3;
   }
   void Serialize(Stream &s) {
      Serialize_Header(s);
      Serialize_Data(s);
   }
};
.....
FileIn fi(file_name);
MyData d;
d.Serialize_Header(fi);
fi.Close()

But in that case LoadFromFile() wont work at all, since both header and data would have this 'magic values' around them?

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