possible to save things like classes,integers etc into files instead of strings?

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Started by johnnyBravo February 28, 2004 02:43 AM

16 comments, last by johnnyBravo 20 years, 1 month ago

358

February 29, 2004 01:43 AM

quote:Original post by johnnyBravo
so i guess i should just store things as strings then?

the thing is tho, i wouldnt be saving pointers, just classes and other data types.

i''d so rather do that, but i guess everyone is saying that is a bad idea.

But this program would probably only be used with ms vc++6 anyway...

But if you are saving classes with pointers to other classes, that''s a bad idea. Same thing as storing a linked list or an hash table just as they are on memory.
When i need to store stuff on a file which references other data i use ID''s to identify the diferent objects. The ID is the cell number of that object on the file. You can then later load the objects from the file and re-link them in memory.
I once made a nice generic memory manager for something like this. It was transparent to the user how the objects were saved and loaded. Probably it wasn''t very efficient but it worked.

- blew

Arild Fines

968

February 29, 2004 08:50 AM

quote:Original post by Zahlman
You might also want to have a look at how the Serializable interface works in Java.

Serializable doesn''t "work" - it''s just a tagging interface. Serialization in Java uses reflection, which is a facility that''s not available in C++.

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Arild Fines

968

February 29, 2004 08:55 AM

quote:Original post by Blew
He DID try to help.

Surely you jest. If you have no clue, you''re more helpful if you keep your mouth shut. Clueless advice is worse than no advice at all.

--AnkhSVN - A Visual Studio .NET Addin for the Subversion version control system.[Project site] [IRC channel] [Blog]

owl

376

February 29, 2004 09:05 AM

quote:Original post by johnnyBravo
hi, im wondering if there are any functions that i could use in c++ on saving and reading files that can hold things like classes, integers, floats etc instead of just holding strings.

So i can read the values straight into the right storage types etc.

Thanks,

fwrite(..) (stdio.h) can write anything you have a pointer for in a file in binary format. Then you can read it with fread().

Arild Fines: What's your contribution to this thread? Your posts bother me most than the Xeneth's one.

[edited by - owl on February 29, 2004 10:06:10 AM]

[size="2"]I like the Walrus best.

Rocket05

152

February 29, 2004 09:26 AM

This process is called serialization. It is used whenever an object has to be converted to a stream, or from a stream to an object (deserialization). Im sure you''ll find plenty of helpful tutorials on serialization on google.

"I never let schooling interfere with my education" - Mark Twain

Warpstorm

122

February 29, 2004 10:17 AM

I find that until you have your code thoroughly debugged and working, the optimization that this gives you isn''t worth the cost of not being able to visually read the contents of the file in your favorite editor.

It is possible and fairly easy to dump your non-poionter, non-reference data into binary though.

Arild Fines

968

February 29, 2004 10:20 AM

quote:Original post by owl
Arild Fines: What''s your contribution to this thread?

None, but at least I''m not offering bad advice. The original question was answered by the third post - the only interesting about this thread now is the meta-discussion.

--AnkhSVN - A Visual Studio .NET Addin for the Subversion version control system.[Project site] [IRC channel] [Blog]

Xeneth

122

February 29, 2004 09:22 PM

quote:Original post by ParadigmShift
quote:Original post by Xeneth
I think it's posible but I'm no expert. Not sure how (haven't delt with reading and printing to file). Why, for saving games?

Technology can either save us or destroy us. Me ... I say it will destroy us if Microsoft is the example.

Is this the most useless post ever or is it just me?

NO it's not just you. I couldn't sleep and that was the result "look at the time".

As for the clueless advise being worse then none. That wasn't advice, that was confromation meining that there is a way and he's on the right track. notice I didn't try telling him how to or that he should or shouldn't. I also asked why so incase I come across the same ressoning or problem.

Technology can either save us or destroy us. Me ... I say it will destroy us if Microsoft is the example.

[edited by - Xeneth on March 1, 2004 7:22:08 AM]

Will you play with me? (Grins Evilly)

possible to save things like classes,integers etc into files instead of strings?

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possible to save things like classes,integers etc into files instead of strings?

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