conversion vertor Iterator to LPCSTR

May 17, 2008 06:33am pdt

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02.17.2008 at 03:41AM PST, ID: 23169454

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7.2

conversion vertor Iterator to LPCSTR

Zones: C / C++ / C# Editors and IDEs, C++ Programming Language

I need to convert i -> vector <int>::iterator i; to LPCSTR.
what is the best solution ? ostringstream??

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Question Stats

Zone: Programming

Question Asked By: BdLm

Solution Provided By: evilrix

Participating Experts: 3

Solution Grade: A

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02.17.2008 at 09:17PM PST, ID: 20917742

ForestDenizen:

Added C++ Programming Langusge Topic Araa

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02.17.2008 at 09:20PM PST, ID: 20917755

lucky_james:

seems like you have a vector which contains LPCSTRs....

then you can dereference the iterator as
LPCSTR str = (*it);

02.17.2008 at 09:21PM PST, ID: 20917760

lucky_james:

oh, sorry my previous comment. i dint see vector <int>.......

02.18.2008 at 12:05AM PST, ID: 20918257

Rank: Wizard

evilrix:

Something like this would work...

                       
                                #include <sstream>
 
std::stringstream ss; // String stream to convert int to string
ss << *it; // Convert
std::string const & sConverted = ss.str(); // Get converted string
LPCSTR str = sConverted.c_str(); // Assign c-string pointer to LPCSTR

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Accepted Solution

02.18.2008 at 12:52AM PST, ID: 20918449

Rank: Genius

itsmeandnobodyelse:

>>>> LPCSTR str = sConverted.c_str();
That is somewhat dangerous as the sConverted string (and the pointer it returns to the internal char buffer) is only valid for the current scope ( == the current {} block)

If you need to pass the LPCSTR to some function, you could do it directly:

some_function(sConverted.c_str());

But some_function shouldn't store the pointer.

If you need to store the pointer you better use a static char buffer:

static char buf[32] = { '\0' };
itoa(*it, buf, 10);

some_function(buf); // buf can be passed as LPCSTR == const char *

Assisted Solution

02.18.2008 at 01:07AM PST, ID: 20918529

Rank: Wizard

evilrix:

>> That is somewhat dangerous as the sConverted string (and the pointer it returns to the internal char buffer) is only valid for the current scope

It's perfectly safe for as long as sConverted is in scope and is indeed why the temporary returned from ss.str() has been bound to a reference, to ensure it stays in scope. Just to clarify, the C++ standard guarantees that a temporary that is bound to a reference will stay in scope for the lifetime of the reference to which it is bound.

02.18.2008 at 01:14AM PST, ID: 20918560

Rank: Wizard

evilrix:

>> It's perfectly safe for as long as sConverted is in scope
Incidentally, this is the same for any pointer that points to a resource... it is only valid for the lifetime of that resource so I'm not quite sure why this would be any different!

02.18.2008 at 01:19AM PST, ID: 20918590

BdLm:

Many Thanks for your Inputs, I'll test today late evening

02.18.2008 at 01:20AM PST, ID: 20918595

Rank: Wizard

evilrix:

>> Many Thanks for your Inputs
Very welcome.

02.18.2008 at 03:35AM PST, ID: 20919042

Rank: Genius

itsmeandnobodyelse:

>>>> it is only valid for the lifetime of that resource so I'm not quite sure why this would be any different!

The only thing to consider is whether a separate pointer variable actually was needed. If it wasn't needed- and I can't see a reason - it should be omitted, i. e. the sConverted.c_str() should be used without storing it into a variable.

LPCSTR is a Windows typedef for 'const char*'. For a few WINAPI functions, e. g. PostMessage function, the LPCSTR pointer passed as an argument needs to be valid beyond the current scope. So, if it isn't clear whether the pointer was used in some asynchronous context, it should point to a member or a static buffer.

02.18.2008 at 03:39AM PST, ID: 20919051

Rank: Wizard

evilrix:

>> The only thing to consider is whether a separate pointer variable actually was needed. If it wasn't needed- and I can't see a reason - it should be omitted, i. e. the sConverted.c_str() should be used without storing it into a variable.

Agreed, but the Q specifically asked for "conversion vertor Iterator to LPCSTR" so that's what I've shown.

Anyway, since we seem to agree (mostly) and since I think it is now clear that the resource must, obviously, be within scope for the pointer to be valid, I'm sure we can leave it at that :)

Thanks Alex.

-Rx.

02.18.2008 at 02:55PM PST, ID: 20924303

BdLm:

many thanks to both of you, now I got a running code. I changed you sample to a Pascal Like function
One minor Item:
better use stringStream or ostringStream?
http://www.c-plusplus.de/forum/viewtopic-var-t-is-39488.html

                       
                                /**************************
 * Solution based on : http://www.experts-exchange.com/Programming/Editors_IDEs/C_CPP_CS/Q_23169454.html
 * V 0.1  (Bdlm, 18.02.2008)
 **************************/
std::string inttostr(int i) { 
std::stringstream ss; // String stream to convert int to string
ss << i; // Convert
std::string  result = ss.str();
return result;

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02.18.2008 at 02:58PM PST, ID: 20924314

BdLm:

split points

evilrix

02.18.2008 at 10:23PM PST, ID: 20926167

There is no need to take a copy of the string in the function, just return the result direct from stringstream.

         
             std::string inttostr(int i)
{ 
	std::stringstream ss; // String stream to convert int to string
	ss << i; // Convert
	return ss.str();
}

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