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On Sunday 02 October 2005 21:58, Roberto Cappuccio wrote:

> I don't know why it does not work with sqlite3.
> If I pass directly myStr.utf().data(), it saves garbage.
> If I copy the stuff in a newly created char* it works fine. This is the
> code that works:
>
>     QString qsValue =3D "=E3=82=B9=E3=83=9D=E3=83=BC=E3=83=84";
>
>     int len =3D qsValue.utf8().length();
>     char* cUTF8 =3D new char[ len + 1 ];
>     memcpy( cUTF8, qsValue.utf8().data(), len );
>     cUTF8[ len ]=3D '\0';
>     int nRes =3D sqlite3_bind_text( mpVM, nParam, cUTF8, -1, SQLITE_STATI=
C );
>
> This is the code that doesn't work:
>
>     int len =3D qsValue.utf8().length();
>     int nRes =3D sqlite3_bind_text( mpVM, nParam,
>     (const char*)qsValue.utf8().data(), -1, SQLITE_STATIC );
>
> I really don't understand why the second way does not work for me.
>
> Thanks

I don't know how SQLite uses the string but QString.data() is only valid as=
=20
long as the QString is not destroyed. And it is no longer valid if you do a=
ny=20
operation on the string. If the sqlite call just keeps a pointer to your=20
string, which is flushed only on a commit, the data pointer will no longer =
be=20
valid. The char* cUTF8 =3D new char[ len + 1 ]; line ensures the data is=20
preserved.

Luciano

=2D-=20
Luciano Montanaro //
                \X/ mikelima@cirulla.net

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