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From: mzdude on 16 Nov 2009 17:41
On Nov 11, 9:51 pm, "Ron Francis" <ronfranci(at)adam.com.au> wrote:
> I'm finally starting to use the string class rather than char* and I'm
> wondering how I would load an LPSTR via LoadString( ) into a string
> variable?
>
> Regards,
> Ron Franciswww.RonaldFrancis.com

Why wouldn't the following work?
We compile with the wide string as the default. If you use the narrow
string make the necessary adjustments

int main()
{
TCHAR *myBuf = 0;
int x = LoadString(0,IDS_STRING101,(LPWSTR)&myBuf,0);
if(x)
std::wstring s(myBuf, myBuf+x);
}
From: Alex Blekhman on 17 Nov 2009 02:41
"mzdude" wrote:
> Why wouldn't the following work?
> We compile with the wide string as the default. If you use the
> narrow string make the necessary adjustments
>
> int main()
> {
> TCHAR *myBuf = 0;
> int x = LoadString(0,IDS_STRING101,(LPWSTR)&myBuf,0);
> if(x)
> std::wstring s(myBuf, myBuf+x);
> }

It won't work because LoadString won't copy anything into myBuf
buffer. LoadString returns the number of chars copied into a
buffer or zero in case of error. You need to allocate destination
buffer upfront, before calling LoadString.

Alex



From: Giovanni Dicanio on 17 Nov 2009 04:23
"Alex Blekhman" <tkfx.REMOVE(a)yahoo.com> ha scritto nel messaggio
news:#XkXwl1ZKHA.5976(a)TK2MSFTNGP05.phx.gbl...

>> TCHAR *myBuf = 0;
>> int x = LoadString(0,IDS_STRING101,(LPWSTR)&myBuf,0);
>> if(x)
>> std::wstring s(myBuf, myBuf+x);
[...]
> It won't work because LoadString won't copy anything into myBuf buffer.
> LoadString returns the number of chars copied into a buffer or zero in
> case of error. You need to allocate destination buffer upfront, before
> calling LoadString.

Alex: I'm not sure because I have not tested that kind of code, but I think
that can be correct.

In fact, I read in LoadString MSDN documentation:

LoadString Function
http://msdn.microsoft.com/en-us/library/ms647486%28VS.85%29.aspx

about 'nBufferMax' parameter:

"If this parameter is zero, then lpBuffer receives a read-only pointer to
the resource itself."

Giovanni



From: Ron Francis on 17 Nov 2009 04:55
"Giovanni Dicanio" <giovanniDOTdicanio(a)REMOVEMEgmail.com> wrote in message
news:uT7Uqf2ZKHA.4920(a)TK2MSFTNGP04.phx.gbl...
> "Alex Blekhman" <tkfx.REMOVE(a)yahoo.com> ha scritto nel messaggio
> news:#XkXwl1ZKHA.5976(a)TK2MSFTNGP05.phx.gbl...
>
>>> TCHAR *myBuf = 0;
>>> int x = LoadString(0,IDS_STRING101,(LPWSTR)&myBuf,0);
>>> if(x)
>>> std::wstring s(myBuf, myBuf+x);
> [...]
>> It won't work because LoadString won't copy anything into myBuf buffer. LoadString returns the
>> number of chars copied into a buffer or zero in case of error. You need to allocate destination
>> buffer upfront, before calling LoadString.
>
> Alex: I'm not sure because I have not tested that kind of code, but I think that can be correct.
>
> In fact, I read in LoadString MSDN documentation:
>
> LoadString Function
> http://msdn.microsoft.com/en-us/library/ms647486%28VS.85%29.aspx
>
> about 'nBufferMax' parameter:
>
> "If this parameter is zero, then lpBuffer receives a read-only pointer to the resource itself."
>
> Giovanni
>

Yes, it does say that!
But I couldn't get it to work.

Regards
Ron Francis
www.RonaldFrancis.com

From: David Lowndes on 17 Nov 2009 04:55
>"If this parameter is zero, then lpBuffer receives a read-only pointer to
>the resource itself."

I was surprised to notice that comment as well - I've never been aware
of it before. I've tried it and it does indeed work!

Dave
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