Re: [Vala] Question about signal connection
Hi Frederik,
Thanks a lot, it works perfectly.
regards,
Johan
Frederik wrote:
public class HelloVala: GLib.Object {
static void handler2 (FileMonitor monitor, File file, File?
other_file,
FileMonitorEvent event_type) {
// ...
}
public static int main (string[] args) {
var file = File.new_for_path (test.png);
var monitor = file.monitor_file (FileMonitorFlags.NONE);
monitor.changed.connect (handler2);
return 0;
}
}
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[Vala] Question about signal connection
Hi,
I wanna check if a file has been changed, and then take some action.
However I am not getting the trick with the signal connection.
the code below returns:
(process:18773): GLib-GObject-WARNING **: IA__g_object_connect: invalid
signal spec changed
well I have checked the specs of GLIB and everything seems to be
correct, maybe something with the Vala notation?
I appreciate any help!
johan
using GLib;
using Gtk;
public class HelloVala: GLib.Object {
int handler2 (FileMonitor monitor,
File file, File other_file, FileMonitorEvent
event_type) {
return 0;
}
public static int main (string[] args) {
var file = File.new_for_path (test.png);
var monitor = file.monitor_file(FileMonitorFlags.NONE);
monitor.connect(changed,handler2);
return 0;
}
}
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Re: [Vala] Question about signal connection
Johan wrote:
Hi,
I wanna check if a file has been changed, and then take some action.
However I am not getting the trick with the signal connection.
the code below returns:
(process:18773): GLib-GObject-WARNING **: IA__g_object_connect: invalid
signal spec changed
well I have checked the specs of GLIB and everything seems to be
correct, maybe something with the Vala notation?
I appreciate any help!
johan
using GLib;
using Gtk;
public class HelloVala: GLib.Object {
int handler2 (FileMonitor monitor,
File file, File other_file, FileMonitorEvent
event_type) {
return 0;
}
public static int main (string[] args) {
var file = File.new_for_path (test.png);
var monitor = file.monitor_file(FileMonitorFlags.NONE);
monitor.connect(changed,handler2);
return 0;
}
}
public class HelloVala: GLib.Object {
static void handler2 (FileMonitor monitor, File file, File? other_file,
FileMonitorEvent event_type) {
// ...
}
public static int main (string[] args) {
var file = File.new_for_path (test.png);
var monitor = file.monitor_file (FileMonitorFlags.NONE);
monitor.changed.connect (handler2);
return 0;
}
}
Best regards,
Frederik
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Re: [Vala] Question about signal connection
Hi Andrea,
Thanks for the fast reply.
I am still doing something wrong, I changed this:
public virtual signal void handler2 (...)
monitor.changed.connect((void) this.handler2);
and get the following:
macro g_signal_connect requires 4 arguments, but only 3 given
That is how the C-code looks like:
// g_signal_connect (monitor, changed, (GCallback) ((void)
g_signal_emit_by_name (self, handler2)));
and that is how it should be:
// g_signal_connect (instance, detailed_signal, c_handler, data)
any idea?
Andrea Bolognani wrote:
On Sat, Nov 07, 2009 at 12:33:58PM +0100, Johan wrote:
Hi,
I wanna check if a file has been changed, and then take some action.
[...]
public static int main (string[] args) {
var file = File.new_for_path (test.png);
var monitor = file.monitor_file(FileMonitorFlags.NONE);
monitor.connect(changed,handler2);
return 0;
}
}
Try using
monitor.changed.connect(handler2);
that should do the trick.
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Re: [Vala] Question about signal connection
Hi Joan, Try this: Signal.connect(monitor, changed, (GLib.Callback)handler2, monitor); Nicolas. ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] Question about signal connection
On Sat, Nov 07, 2009 at 13:16:02 +0100, Johan wrote: Hi Andrea, Thanks for the fast reply. I am still doing something wrong, I changed this: public virtual signal void handler2 (...) No 'signal' keyword here. A handler is just a function. It must have a signature that matches the signal it will connect to and of course it must have a body. (The handler also does not need to be public, if the connect is in a method of that class) monitor.changed.connect((void) this.handler2); You should not have any cast here. A (void) cast in particular is complete nonsense -- it would be (void *) if you meant just untyped reference. Generally, you should need very few casts in correct vala code. Whenever you seem to need a cast, it's quite likely something else is wrong, so make sure you really understand what is going on before you write a cast. and get the following: macro g_signal_connect requires 4 arguments, but only 3 given That is how the C-code looks like: // g_signal_connect (monitor, changed, (GCallback) ((void) g_signal_emit_by_name (self, handler2))); Vala should not have generated this. It should have probably errored out saying the signal 'handler2' can't be used as value. and that is how it should be: // g_signal_connect (instance, detailed_signal, c_handler, data) any idea? -- Jan 'Bulb' Hudec b...@ucw.cz ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
Re: [Vala] Question about signal connection
On Sat, Nov 07, 2009 at 14:47:16 +0100, Nicolas wrote: Signal.connect(monitor, changed, (GLib.Callback)handler2, monitor); No. That won't work without some magic applied to handler2, because the call signature for signal handlers is different from regular methods. The normal syntax: object.signame.connect(invocant.handler) is easier and better. (I assume you didn't mean to pass the same object as emitter and handler invocant above, as that makes no sense) -- Jan 'Bulb' Hudec b...@ucw.cz ___ Vala-list mailing list Vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
