[c++] wstring conversion

There are two necessary steps for converting a string: allocating a buffer and then performing the actual conversion. For a narrow string to a wide string those two steps could be accomplished like so:

#include <cstdlib>#include <vector>#include <string>#include <iostream>int main(int, char **) {  std::string str = "Moo! Moo, I Say!";    std::vector<wchar_t> buffer(mbstowcs(0, str.c_str(), 0) + 1); // allocate the buffer  mbstowcs(&buffer[0], str.c_str(), buffer.size());  // perform the conversion    std::wcout << &buffer[0];  return 0;}

To go from a wide string to a narrow string you could use wcstombs() instead of mbstowcs().

thx !

but I can't get it working to narrow the string ...

I used wcstombs() as you said, but it ain't working..

//name == wstring, parameter of functionvector<char> buffer(wcstombs(0, name.c_str(), 0) + 1); // allocate the bufferwcstombs(&buffer[0], name.c_str(), buffer.size());  // perform the conversionm_pActor->setName(&buffer[0]); // actor is PhysX : virtual void setName (const char *name)=0 

what I'm I doing wrong ?

likely your vector is going out of scope, thus your m_pActor->setName() is pointing at garbage.

(unless aint working means something else. Please be more specific)

well, it is pointing at garbage, that's the problem...

Quote:

ex : name = box01 but the name of the actor is set to 'îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþîþ£Öú#uë'

see ?
I want to convert a wstring so I can use it as argument of setname(const char* name)...

how can I convert this correctly ?

thx

If you figure you're going to be dealing with ASCII-ish characters (e.g.: English alphabet, Arabic numerals, slashes, periods, etc, but NOT Japanese characters), then you can probably go the easy route:



If for some reason you're using something like Japanese characters, then converting to regular strings is a bad idea from the start.

[Edited by - taby on December 29, 2008 6:31:09 PM]

Quote:

Original post by Yourself thx ! but I can't get it working to narrow the string ... I used wcstombs() as you said, but it ain't working.. //name == wstring, parameter of functionvector<char> buffer(wcstombs(0, name.c_str(), 0) + 1); // allocate the bufferwcstombs(&buffer[0], name.c_str(), buffer.size()); // perform the conversionm_pActor->setName(&buffer[0]); // actor is PhysX : virtual void setName (const char *name)=0

This one?

If so, then you have two ways:
- pass string literal: m_actor->setName("SomeName");
- allocate new string to store by setName:

const char * s = new char[buffer.size()+1];strcpy(s, &buffer[0]);m_actor->setName(s);....// when destroying m_actordelete[] m_actor->getName();

- same as before, but don't bother with deleting and just leak memory

But like documentation says, that's debugging function.