converting char* to wstring

[bajajv]

Hi,
I have to add one string and one integer in an existing string.

eg. int32 number and wstring Title to an existing wstring.

how can this be done?

[Sick0Fant]

Hi,
I have to add one string and one integer in an existing string.

eg. int32 number and wstring Title to an existing wstring.

how can this be done?

What's a wstring? If you just mean a C++ string, then you can convert the int to a string and use concatonation.. . More info, please.

[bajajv]

we are using std::wstring.
it is different than std::string.. this is what I know about it currently.

I have
std::wstring A;
int32 B;
std::wstring C;

I want to add these 3.

char buff[2];
sprintf(buff, "%s", B);
string s = "";
s.insert(0, buff);
std::wstring C (s.length(), L" ");
C.copy(s.begin( ), s.end(), C.begin());
C.append(A);

But it is giving error here -> std::wstring C (s.length(), L" ");

error C2664: cannot convert parameter 1 from 'unsigned int' to 'const std::basic_stri ng<_Elem,_Trait s,_Ax> &'
1> with
1> [
1> _Elem=wchar_t,
1> _Traits=std::ch ar_traits<wchar _t>,
1> _Ax=std::alloca tor<wchar_t>
1> ]

[arnaudk]

Assuming you are referring to a string of wide chars, you can just use the wide analogs to normal C string functions, see wchar.h,
Specifically, have a look at swscanf().

[arnaudk]

Ah, sorry, I replied at the same time you did.
If you are using C++, then you can put your string in a stringstream and then append anything you want to it with the usual stream operator <<. For wstring, you use the analog wstringstream which I believe is also defined in <sstream.h>.

[Sick0Fant]

Assuming you are referring to a string of wide chars, you can just use the wide analogs to normal C string functions, see wchar.h,
Specifically, have a look at swscanf().

Interesting. Are wstrings used to accomodate foreign chars or something? Maybe I'll just google it :-)

[arnaudk]

I've never used them myself to be honest. What I know is that a char is 1 byte or 256 values, enough to describe the ASCII character set but a wchar is bigger and can accommodate extended ascii/unicode. It is used primarily for internationaliz ation as you suggest.

[bajajv]

Interesting. Are wstrings used to accomodate foreign chars or something? Maybe I'll just google it :-)

I guess so, not 100% sure...

[oler1s]

I've never used them myself to be honest. What I know is that a char is 1 byte or 256 values, enough to describe the ASCII character set but a wchar is bigger and can accommodate extended ascii/unicode. It is used primarily for internationaliz ation as you suggest.

Yes. There is something called a C++ byte (independent of what your platform thinks is a byte). This C++ byte is guaranteed to have at least 8 bits. It can have more (like 9, 16, 36, 64, etc.). This minimum guarantee is great when you only need ASCII. But it fails in any kind of larger encoding, like UTF-16. Which is what wstring can handle.