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I have an active control which is published. Now I want to add two new methods to this control to provide new functionality. Just like COM is the activex immutable ? If yes, how do I achieve it. I mean we declare new interfaces in COM when providing new functionality and QueryInterface determines whether to use the new functionality exists or not. How can I achieve this in activex control.
"C makes it easy to shoot yourself in the foot. C++ makes it
harder, but when you do, it blows away your whole leg."
- Bjarne Stroustrup
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See my reply in the C++ forum here[^].
--
Roger
It's suppose to be hard, otherwise anybody could do it!
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I have an atl application that uses an activex control which I create at runtime. I am currently using #import. Now I have a new version of the activex which has some new features, I would like the option of using either of them based on some config setting somewhere. Don't think #import will work in this scenario. Any help is greatly appreciated.
Kurt
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OK, following on from the char -> wchar_t question earlier, does anyone know of a neat STL-friendly way to perform UTF8 encoding/decoding? Currently I use the MS character encoding macros, e.g.:
wstring str = CA2W(utf8_string, CP_UTF8).m_psz;
But I'd like to use something that is a bit more platform independent! 
The Rob Blog
Google Talk: robert.caldecott
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AFAIK STL doesn't have UTF-8 support because the elements in a basic_string have to all be the same size, and the UTF-8 encodings of characters have variying sizes.
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ
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Never mind. You can store a utf-8 string as a sequence of bytes in std::string, just need to know which functions operate correctly on such a sequence and which not.
As for the conversion, I have been writing an article on platform-independent STL friendly utf-8 string operations for months, but I just can't make myself finish it 
My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.
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Nemanja Trifunovic wrote: As for the conversion, I have been writing an article on platform-independent STL friendly utf-8 string operations for months, but I just can't make myself finish it
Man, that would be sweet...
The Rob Blog
Google Talk: robert.caldecott
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In the Microsoft stl libraries, localization uses C interface. The locale class calls setlocale function. And it cannot work with UTF-8.
From the Remarks section on the setlocale function reference:
"The set of available languages, country/region codes, and code pages includes all those supported by the Win32 NLS API (except code pages that require more than two bytes per character, like UTF-8)."
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Yeah once again about it!
I know, there is a way to do it using crt function mbstowcs. The first thing I do not like about it I have single-byte character string (in the cp1251 encoding for example). The second it's not about stl.
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alabax wrote: Yeah once again about it!
huu ???[^]
how many CP accounts do you have ? 
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that's the only 
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yeah, that's what i see, so, why did you say "once again about it" ??? 
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I mean questions like this appear every month on the newsgroups and message boards. =)
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like this:
wstring s2w(const string &s)
{
size_t l=s.size()+1;
const char *pc=s.c_str();
wchar_t *pw=new wchar_t[l];
locale loc("");
use_facet<ctype<wchar_t>>(loc).widen(pc,pc+l-1,pw);
return wstring(pw);
}
-- modified at 14:03 Wednesday 12th April, 2006
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Look s about right - proof of the pudding's in the testing, of course!
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OMG! It's such a shame I did new without delete
GC is deep in my mind!
wstring s2w(const string &s)
{
size_t l=s.size()+1;
const char *pc=s.c_str();
wchar_t *pw=new wchar_t[l];
if (pw==0) throw;
locale loc("");
use_facet<ctype<wchar_t>>(loc).widen(pc,pc+l-1,pw);
wstring ws(pw);
delete [] pw;
return ws;
}
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You could always use a vector instead.
vector<wchar_t> pw(l);
...
use_facet<ctype<wchar_t> >(loc).widen(pc,pc+l-1,&pw[0]);
wstring ws(&pw[0]);
The Rob Blog
Google Talk: robert.caldecott
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You're not freeing the memory used by pw, unless I've missed something?
The Rob Blog
Google Talk: robert.caldecott
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locale global_locale;
wstring s2w(const string &s,const locale &loc=global_locale)
{
size_t l=s.length()+1;
const char *pc=s.c_str();
wchar_t *pw=new wchar_t[l];
if (pw==0) throw;
use_facet<ctype<wchar_t>>(loc).widen(pc,pc+l-1,pw);
pw[l-1]=L'\0';
wstring ws(pw);
delete [] pw;
return ws;
}
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Not exception safe
As others suggested, use std::vector or boost::scoped_array instead of new[]-delete[]
My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.
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Ok, here comes cute solution
wstring s2w(const string &s,const locale &loc=global_locale)
{
size_t l=s.length();
vector<wchar_t> pw(l+1);
use_facet<ctype<wchar_t>>(loc).widen(&s[0],&s[l],&pw[0]);
wstring ws(&pw[0]);
return ws;
}
widen does not append trailing L'\0'!
The question is: does vector always initialize values to 0?
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alabax wrote: The question is: does vector always initialize values to 0?
Yes, the default value of a simple type using this vector ctor:
explicit vector(size_type count); is 0. For classes, the default ctor is run, if no explicit value is provided in this vector ctor:
vector(size_type count, const T& value); .
--
The Blog: Bits and Pieces
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hi all,
how to acess messages from MSMQ Events when message arrived from source to Destination in OnArrived() function.
thanks,
uday.
uday kiran
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