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Don
#1 / 12
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 String Stream Formatting This is my first foray into the world of streams and formatting, so maybe I just do not get the fundamentals. However, I am at a loss on where to go to figure this out. In my header I include the string stream class:
#include <strstrea.h>
In the code, I create the string and use it:
ostrstream ostr(ControlString,25);
ostr.seekp(0);
ostr.width(8);
ostr.fill(0);
ostr << showbase(hex);
ostr << ACUMessage.MessageStart;
ostr << ends;
SetDlgItemText(IDC_Preamble_Rx, ControlString );
but get the error:
error C2065: 'showbase' : undeclared identifier
for showbase. The way I understand it, ostrstream is derived from ios_base.
I have even tried prefixing it with ios_bass:: with no luck.
Would someone be so kind as to enlighten me on where I am screwing up or at
maybe provide a good reference on the topic?!
Thanks!!
Don
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| Sun, 27 Feb 2005 21:23:43 GMT |
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Craig Power
#2 / 12
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String Stream Formatting Quote:
> This is my first foray into the world of streams and formatting, so maybe I
> just do not get the fundamentals. However, I am at a loss on where to go to
> figure this out.
> In my header I include the string stream class:
> #include <strstrea.h>
I would strongly recommend using <sstream> (which, incidentally, will put everything in the standard namespace). strstreams are deprecated and should be avoided absent a specific need. And if you still want to use strstreams, you should use <strstream>, not the .h version. Quote: > In the code, I create the string and use it: > ostrstream ostr(ControlString,25);
> ostr.seekp(0);
> ostr.width(8);
> ostr.fill(0);
> ostr << showbase(hex);
showbase very likely requires inclusion of <iomanip>. (<iomanip.h> if you insist on using the nonstandard headers.) Good references:
The standard library documentation in VC (can be a bit cryptic, but
still useful as a reference)
"The C++ Standard Library: A Tutorial and Reference" by Josuttis
and I believe there's an iostreams book by Langer and Kreft that's
also recommended.
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| Sun, 27 Feb 2005 21:45:30 GMT |
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#3 / 12
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String Stream Formatting
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| Fri, 19 Jun 1992 00:00:00 GMT |
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Don
#4 / 12
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String Stream Formatting Craig, Thanks for the pointers! My use of strstrea and the .h is not so much a
design decision on my part, more a ignorant cobbling together of examples!!
Having said that, I put
#include <sstream>
in my header file and changed the main code to:
ostringstream ostr;
per an example out of Stroustrup (3rd Edition). But now I get:
error C2065: 'ostringstream' : undeclared identifier
I have tried a variety of permutations and have looked through the MSDN with
no luck. Is this a namespace problem? Should there be other #includes
(like <iomanip> in your original reply)?
I am perplexed!
Thanks!!
Don
Quote:
> > This is my first foray into the world of streams and formatting, so
maybe I
> > just do not get the fundamentals. However, I am at a loss on where to
go to
> > figure this out.
> > In my header I include the string stream class:
> > #include <strstrea.h>
> I would strongly recommend using <sstream> (which, incidentally, will
> put everything in the standard namespace). strstreams are deprecated
> and should be avoided absent a specific need. And if you still want
> to use strstreams, you should use <strstream>, not the .h version.
> > In the code, I create the string and use it:
> > ostrstream ostr(ControlString,25);
> > ostr.seekp(0);
> > ostr.width(8);
> > ostr.fill(0);
> > ostr << showbase(hex);
> showbase very likely requires inclusion of <iomanip>. (<iomanip.h> if
> you insist on using the nonstandard headers.)
> Good references:
> The standard library documentation in VC (can be a bit cryptic, but
> still useful as a reference)
> "The C++ Standard Library: A Tutorial and Reference" by Josuttis
> and I believe there's an iostreams book by Langer and Kreft that's
> also recommended.
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| Sun, 27 Feb 2005 23:58:04 GMT |
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Carl Danie
#5 / 12
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String Stream Formatting
Quote: > ostringstream ostr;
std::ostringstream ostr; -cd
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| Mon, 28 Feb 2005 00:16:59 GMT |
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Craig Power
#6 / 12
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String Stream Formatting Quote:
> Thanks for the pointers! My use of strstrea and the .h is not so much a
> design decision on my part, more a ignorant cobbling together of examples!!
> Having said that, I put
> #include <sstream>
> in my header file and changed the main code to:
> ostringstream ostr;
std::ostringstream ostr; Or else you need a using directive after including <sstream>
Quote: > per an example out of Stroustrup (3rd Edition). But now I get: > error C2065: 'ostringstream' : undeclared identifier
> I have tried a variety of permutations and have looked through the MSDN with
> no luck. Is this a namespace problem? Should there be other #includes
> (like <iomanip> in your original reply)?
The only thing you'd need <iomanip> for is if you use manipulators. It's certainly not required for declaring an instance of a stringstream.
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| Mon, 28 Feb 2005 00:15:25 GMT |
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#7 / 12
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String Stream Formatting
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| Fri, 19 Jun 1992 00:00:00 GMT |
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Don
#8 / 12
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String Stream Formatting Craig & Carl, Okay, I am now making some progress. Turns out to be a namespace problem.
I added a std:: to the ostringstream and things started getting better!!
Looks like my problems are centering around namespaces (something I have
avoiding learning ....... until now!).
**-> Why, when I was using #include <strstrea.h>, did it not complain about
not having the std:: before the ostrstream? Is the difference between <*.h>
and <*> form for include the fact that the latter requires namespace
resolution?
Well, now that I have it compiling with the new stream stuff, I have to
figure out why everything else now doesn't work! Argh!!
Anyway, thanks for your help! I think I might be getting enough of a grasp
on this to be able to ask stupid questions instead of truly idiotic ones!!
Thanks!
Don
Quote: > Craig, > Thanks for the pointers! My use of strstrea and the .h is not so much a
> design decision on my part, more a ignorant cobbling together of
examples!!
> Having said that, I put
> #include <sstream>
> in my header file and changed the main code to:
> ostringstream ostr;
> per an example out of Stroustrup (3rd Edition). But now I get:
> error C2065: 'ostringstream' : undeclared identifier
> I have tried a variety of permutations and have looked through the MSDN
with
> no luck. Is this a namespace problem? Should there be other #includes
> (like <iomanip> in your original reply)?
> I am perplexed!
> Thanks!!
> Don
> > > This is my first foray into the world of streams and formatting, so
> maybe I
> > > just do not get the fundamentals. However, I am at a loss on where to
> go to
> > > figure this out.
> > > In my header I include the string stream class:
> > > #include <strstrea.h>
> > I would strongly recommend using <sstream> (which, incidentally, will
> > put everything in the standard namespace). strstreams are deprecated
> > and should be avoided absent a specific need. And if you still want
> > to use strstreams, you should use <strstream>, not the .h version.
> > > In the code, I create the string and use it:
> > > ostrstream ostr(ControlString,25);
> > > ostr.seekp(0);
> > > ostr.width(8);
> > > ostr.fill(0);
> > > ostr << showbase(hex);
> > showbase very likely requires inclusion of <iomanip>. (<iomanip.h> if
> > you insist on using the nonstandard headers.)
> > Good references:
> > The standard library documentation in VC (can be a bit cryptic, but
> > still useful as a reference)
> > "The C++ Standard Library: A Tutorial and Reference" by Josuttis
> > and I believe there's an iostreams book by Langer and Kreft that's
> > also recommended.
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| Mon, 28 Feb 2005 00:45:59 GMT |
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Carl Danie
#9 / 12
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String Stream Formatting
Quote: > **-> Why, when I was using #include <strstrea.h>, did it not complain
about
> not having the std:: before the ostrstream? Is the difference between
<*.h>
> and <*> form for include the fact that the latter requires namespace
> resolution?
Correct - the old (pre standard) classes were not in the std namespace. The same relatinship exists between the classes declared in <iostream> versus those declared in <iostream.h>. -cd
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| Mon, 28 Feb 2005 01:05:53 GMT |
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Craig Power
#10 / 12
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String Stream Formatting Quote:
> **-> Why, when I was using #include <strstrea.h>, did it not complain about
> not having the std:: before the ostrstream? Is the difference between <*.h>
> and <*> form for include the fact that the latter requires namespace
> resolution?
That's the most obvious difference, but hardly the only one. Note that the <*> form is the standardized form. The <*.h> is older
and pre-standard, and what you get with those headers can vary from
compiler to compiler. As of VC7, Microsoft has signalled their
intention to delete the <*.h> form of the iostreams from future
releases.
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| Mon, 28 Feb 2005 02:32:01 GMT |
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#11 / 12
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String Stream Formatting
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| Fri, 19 Jun 1992 00:00:00 GMT |
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Don
#12 / 12
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String Stream Formatting Thanks Carl & Craig!
Don
Quote: > Craig & Carl, > Okay, I am now making some progress. Turns out to be a namespace problem.
> I added a std:: to the ostringstream and things started getting better!!
> Looks like my problems are centering around namespaces (something I have
> avoiding learning ....... until now!).
> **-> Why, when I was using #include <strstrea.h>, did it not complain
about
> not having the std:: before the ostrstream? Is the difference between
<*.h>
> and <*> form for include the fact that the latter requires namespace
> resolution?
> Well, now that I have it compiling with the new stream stuff, I have to
> figure out why everything else now doesn't work! Argh!!
> Anyway, thanks for your help! I think I might be getting enough of a
grasp
> on this to be able to ask stupid questions instead of truly idiotic ones!!
> Thanks!
> Don
> > Craig,
> > Thanks for the pointers! My use of strstrea and the .h is not so much a
> > design decision on my part, more a ignorant cobbling together of
> examples!!
> > Having said that, I put
> > #include <sstream>
> > in my header file and changed the main code to:
> > ostringstream ostr;
> > per an example out of Stroustrup (3rd Edition). But now I get:
> > error C2065: 'ostringstream' : undeclared identifier
> > I have tried a variety of permutations and have looked through the MSDN
> with
> > no luck. Is this a namespace problem? Should there be other #includes
> > (like <iomanip> in your original reply)?
> > I am perplexed!
> > Thanks!!
> > Don
> > > > This is my first foray into the world of streams and formatting, so
> > maybe I
> > > > just do not get the fundamentals. However, I am at a loss on where
to
> > go to
> > > > figure this out.
> > > > In my header I include the string stream class:
> > > > #include <strstrea.h>
> > > I would strongly recommend using <sstream> (which, incidentally, will
> > > put everything in the standard namespace). strstreams are deprecated
> > > and should be avoided absent a specific need. And if you still want
> > > to use strstreams, you should use <strstream>, not the .h version.
> > > > In the code, I create the string and use it:
> > > > ostrstream ostr(ControlString,25);
> > > > ostr.seekp(0);
> > > > ostr.width(8);
> > > > ostr.fill(0);
> > > > ostr << showbase(hex);
> > > showbase very likely requires inclusion of <iomanip>. (<iomanip.h> if
> > > you insist on using the nonstandard headers.)
> > > Good references:
> > > The standard library documentation in VC (can be a bit cryptic, but
> > > still useful as a reference)
> > > "The C++ Standard Library: A Tutorial and Reference" by Josuttis
> > > and I believe there's an iostreams book by Langer and Kreft that's
> > > also recommended.
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| Mon, 28 Feb 2005 03:33:44 GMT |
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