Re: PQexecPrepared() question

Hi, Peter,

On Mon, Dec 22, 2025 at 1:55 AM Peter J. Holzer <hjp-pgsql(at)hjp(dot)at> wrote:
>
> On 2025-12-21 17:30:38 -0800, Igor Korot wrote:
> > On Sun, Dec 21, 2025 at 1:19 PM Peter J. Holzer <hjp-pgsql(at)hjp(dot)at> wrote:
> > > As I see it, Igor has two options:
> > >
> > > 1) Send UTF8. wcstombs is the wrong tool for this, since it uses the
> > > current locale which is obviously not using UTF-8. I don't program in
> > > C++, but I'm pretty sure there is a portable way to encode a string
> > > in UTF-8.
> [...]
> > > I think 1) is the better strategy, but them I've been a UTF-8 fan-boy
> > > for over 30 years ;-).
> >
> > Maybe all I need is something like this:
> >
> > convert(char *dest, const std::wstring src)
> > {
> > const wchar_t *temp = src.c_str();
> > while( *dest )
> > {
> > dest++;
> > }
> > while( *temp )
> > {
> > *dest = *temp;
> > dest++;
> > temp++;
> > }
> > *dest++ = '\0';
> > *dest = '\0';
> > }
> >
> > ?
>
> I hope your compiler complains loudly about that code. You can't just
> assign a wchar_t to a char and expect it to do anything sensible.

At least MSVC 2017 did not.
However, trying didn't solve it. Same error.

>
> A short search points to std::wstring_convert, but that has been
> deprecated in C++17, and it's not obvious to me what the replacement is.
>
> There is always ICU, of course, but that feels like cracking a nut with
> a sledgehammer.

I think ICU IS a replacement for wstring_comvert.
Will check it.

>
> Personally, I might roll my own if an hour of googling doesn't turn up
> anything promising (UTF-8 encoding is quite simple), but that shouldn't
> be necessary.
>
>
> hjp
>
> --
> _ | Peter J. Holzer | Story must make more sense than reality.
> |_|_) | |
> | | | hjp(at)hjp(dot)at | -- Charles Stross, "Creative writing
> __/ | http://www.hjp.at/ | challenge!"