Re: [Vala] How to ignore exceptions?

[PCMan <pcman tw gmail com>]

Is it possible to suppress these compiler warnings and not turn off all of
the warnings at the same time?

On Sun, Oct 30, 2011 at 9:04 PM, JM <interflug1 gmx net> wrote:

> just don't use the try-catch block:
>
>  str1 = kf.get_string(group, key);
>  str2 = kf.get_string(group, key);
>  str3 = kf.get_string(group, key);
>
> This will give you a warning during compile but should be the thing you
> are looking for.
>
> jm.
>
>
> Am Sonntag, den 30.10.2011, 19:04 +0800 schrieb PCMan:
> > Hi all,
> > I started using Vala recently and I'm confused by exception handling in
> > Vala.
> > I'm quite used to write C/GObject code and handles GError.
> > However, with exceptions, flow-control becomes quite different.
> > For example, I'm reading values from a KeyFile.
> > With C/glib, I can pass NULL GError* pointer to g_key_file_get_string()
> to
> > ignore any errors.
> > If the errors are not critical for my program, it's safe to ignore them
> all
> > like this.
> >
> > str1 = g_key_file_get_string(kf, group, key, NULL);
> > str2 = g_key_file_get_string(kf, group, key, NULL);
> > str3 = g_key_file_get_string(kf, group, key, NULL);
> > if( !str1 && !str2 && !str3)
> >     return FALSE;
> >
> > With Vala, I cannot do this. If I use try/catch, things are totally
> > different.
> >
> > try {
> >     str1 = kf.get_string(group, key);
> >     str2 = kf.get_string(group, key);
> >     str3 = kf.get_string(group, key);
> > }
> > catch(KeyFile.Error error) {
> >     // If anyone of the preceding calls fails, we get here.
> >     // then I cannot continue getting the remaining strings from key
> file.
> > }
> > If get str1 fails, the excution jumps to catch() block, and I cannot
> > continue reading str2 and str3.
> >
> > Of course I can do this:
> > try {
> >     str1 = kf.get_string(group, key);
> > }
> > catch(KeyFile.Error error) {
> > }
> > try {
> >     str2 = kf.get_string(group, key);
> > }
> > catch(KeyFile.Error error) {
> > }
> > try {
> >     str3 = kf.get_string(group, key);
> > }
> > catch(KeyFile.Error error) {
> > }
> >
> > Apparently, this looks even worse then its C/glib counterpart.
> > So, how to ignore the GErrors/vala excaptions anyways?
> >
> > Thank you all.
> > _______________________________________________
> > vala-list mailing list
> > vala-list gnome org
> > http://mail.gnome.org/mailman/listinfo/vala-list
>
>
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