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How to use FileStream? [message #8202]

Sun, 18 February 2007 16:42

Ulti
Messages: 108
Registered: September 2006

Experienced Member

Any example to show how to use Stream class?
my following code result empty file

[I]char data[512];
for(int i=0;i<512;i++) data=0;
MemStream ms(data,512);
header.ToBuf(ms);
CDocFile.Put(data,512);

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Re: How to use FileStream? [message #8206 is a reply to message #8202]

Sun, 18 February 2007 21:04

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Stream is fully documented, but I guess we could add a couple of detailed examples.

Anyway, your code snippets is too small and undefined. Could you care to post something more substantial?

Mirek

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Re: How to use FileStream? [message #8207 is a reply to message #8206]

Mon, 19 February 2007 04:15

Ulti
Messages: 108
Registered: September 2006

Experienced Member

Sorry,it's my stupid,I just forget to save the buffer into filestream.

but I wonder if my idea is the best one,hope you can give some advice:

I have a buffer which hold 512byte character,and I want save it into file like this way
void CompoundFile::Header::ToBuf(MemStream &buf)
{
buf.Put64le(MagicId);
buf.Put64le(UID1);
buf.Put64le(UID2);
buf.Put16le(rev);
buf.Put16le(ver);
buf.Put16le(byteorder);
buf.Put16le(ssz);
buf.Put16le(sssz);
buf.Put16le(notused1);
buf.Put64le(notused2);
buf.Put32le(SATSecCnt);
buf.Put32le(DirStartSID);
buf.Put32le(notused3);
buf.Put32le(StdStreamSize);
buf.Put32le(SSATStartSID);
buf.Put32le(SSATSecCnt);
buf.Put32le(MSAT1StartSID);
buf.Put32le(MSAT1SecCnt);
buf.Put32le(MSAT1SecCnt);
for(int i=0;i<109;i++)
buf.Put32le(MSAT0[i]);
}
first I put this 512byte into MemStream,and then use the already exist method to write big/little endian,and then put this MemStream into FileStream.
is this is the best way,or any other good ideas(I don't want write any other endian function,they are already in Stream)?

thanks a lot!

[Updated on: Mon, 19 February 2007 04:16]

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Re: How to use FileStream? [message #8223 is a reply to message #8207]

Tue, 20 February 2007 22:29

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Sound quite good, the only complaint I can make is that you probably should use "Stream" instead of "MemStream" to make your method more generic (usable with any Stream derived class you will need in future).

MemStream is very specific Stream kind, with rather limited use.

Mirek

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Re: How to use FileStream? [message #8225 is a reply to message #8223]

Wed, 21 February 2007 01:01

Ulti
Messages: 108
Registered: September 2006

Experienced Member

Thanks

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Re: How to use FileStream? [message #8277 is a reply to message #8223]

Wed, 28 February 2007 01:39

Ulti
Messages: 108
Registered: September 2006

Experienced Member

luzr wrote on Tue, 20 February 2007 16:29

Steam has the only pure virtual member,is this desired?

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Re: How to use FileStream? [message #8282 is a reply to message #8277]

Wed, 28 February 2007 09:29

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Ulti wrote on Tue, 27 February 2007 19:39

luzr wrote on Tue, 20 February 2007 16:29

Steam has the only pure virtual member,is this desired?

Yes. Stream itself does not specificy the "media".

You define your function to work with "Stream", then use specific Stream derived class to store/load from file, memory of whatever.

Mirek

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