Convert std::string to std::vector<unsigned char> and vice versa

[timor.super]

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.

[Alf P. Steinbach]

* ti*********@gmail.com:

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

std::string s = "abra kadabra";
std::vector<unsigned charv( 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?

[=?iso-8859-1?q?Erik_Wikstr=F6m?=]

On 2 Apr, 14:20, [e-mail] 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

[timor.super]

On 2 avr, 15:37, "Erik Wikström" <[e-mail]:

On 2 Apr, 14:20, [e-mail] 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.