Re: [gtk-list] Re: Gtk--: Stupid string-->char conversion question

["Eugene Thompson" <gthompson pin-corp com>]

Robert,

You might try using the new cast operators in C++, in this case the
const_cast <> operator, like this.

char*    fName = const_cast <char*> (d_fileSelection->get_filename ().data
());
This casts away the const attribute of the return type of the data method. I
may be wrong, but I don't see how the other way can work.
>      char *fname = d_fileSelection->get_filename().data().c_str();
Since data returns a const char* (which isn't a class), it doesn't have the
c_str method. I am going to assume that the line was a typo and that it
should have read:
>      char *fname = d_fileSelection->get_filename().c_str();
Unfortunately, this also returns a const char* which leaves you in the same
boat of assigning a const pointer to a non-const variable. If you don't like
casting (and the const_cast operator is not very far from the C-style
casting) and you are not going to modify the pointer value, you could just
create the fname variable as a const char*:
const char*    fname = d_fileSelection->get_filename().c_str();        //
.data (); They both work.

This takes care of the conversion, but without knowing what kind of odd
behaviour you are getting, I don't know if the two are related.

Hope this helps,
Gene

-----Original Message-----
From: Paul Barton-Davis <pbd@op.net>
To: gtk-list@redhat.com <gtk-list@redhat.com>
Date: Monday, June 28, 1999 8:31 AM
Subject: [gtk-list] Re: Gtk--: Stupid string-->char conversion question


>In message <OFAEE275E3.2F9A36F6-ONC125679E.004B688B@peoplesoft.com>you
write:
>>Hi,
>>
>>I'm using Gtk-- and seem to have some odd behaviour
>>when reading data from entry boxes. Here's what I'm doing
>>to get the resulting input value:
>>
>>     char *fname = (char *) (d_fileSelection->get_filename().data());
>
>Assuming that the rval is a string or string&, use
>
>      char *fname = d_fileSelection->get_filename().data().c_str();
>
>There is no builtin cast to (char *) for the string class.
>
>--p
>
>--
>To unsubscribe: mail -s unsubscribe gtk-list-request@redhat.com < /dev/null
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