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Hi group,

how to convert a string to a vector of unsigned char ?
I used to iterate trough the string to set the vector, but I think
this is not the best way to do this.
I'm a beginner with the STL

How about allocating the vector ? should I know before the size ?

And I would like to do then opposite conversion, from an unsigned char
vector to a string.
How to do this ? how about special caracters ? (\n for example)

Thanks for your help


Best regards,

N.

* :
>
> how to convert a string to a vector of unsigned char ?

std::string s = "abra kadabra";
std::vector<unsigned char> v( s.begin(), s.end() );


> I used to iterate trough the string to set the vector, but I think
> this is not the best way to do this.
> I'm a beginner with the STL
>
> How about allocating the vector ? should I know before the size ?

Huh.


> And I would like to do then opposite conversion, from an unsigned char
> vector to a string.
> How to do this ?

std::string t( v.begin(), v.end() );


> how about special caracters ? (\n for example)

Irrelevant.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

On 2 Apr, 14:20, timor.su...@gmail.com wrote:
> Hi group,
>
> how to convert a string to a vector of unsigned char ?
> I used to iterate trough the string to set the vector, but I think
> this is not the best way to do this.
> I'm a beginner with the STL
>
> How about allocating the vector ? should I know before the size ?

If you have very large strings you can run v.reserve(s.size()) before
inserting, which might give a speed improvement. But you don't have
to.

--
Erik Wikström

On 2 avr, 15:37, "Erik Wikström" <eri...@student.chalmers.se> wrote:
> On 2 Apr, 14:20, timor.su...@gmail.com wrote:
>
> > Hi group,
>
> > how to convert a string to a vector of unsigned char ?
> > I used to iterate trough the string to set the vector, but I think
> > this is not the best way to do this.
> > I'm a beginner with the STL
>
> > How about allocating the vector ? should I know before the size ?
>
> If you have very large strings you can run v.reserve(s.size()) before
> inserting, which might give a speed improvement. But you don't have
> to.
>
> --
> Erik Wikström


Thanks both for your answer, that solves my problem

Best regards,

N.