Hey i've been writing an application in which i need to create thread to perform background tasks while the GUI is being loaded. However no matter that i do i can find a way around this error:
error: invocation of void method not allowed as expression
Thread<void> thread = new Thread<void>.try("Conntections Thread.", devices_online(listmodel));
The line in question is the creating of a new thread which calls the "devices_online" method.
The Full code which is being effected is:
try {
Thread<void> thread = new Thread<void>.try("Conntections Thread.", devices_online(listmodel));
}catch(Error thread_error){
//console print thread error message
stdout.printf("%s", thread_error.message);
}
And Method is:
private void devices_online(Gtk.ListStore listmodel){
//clear the listview
listmodel.clear();
//list of devices returned after connection check
string[] devices = list_devices();
//loop through the devices getting the data and adding the device
//to the listview GUI
foreach (var device in devices) {
string name = get_data("name", device);
string ping = get_data("ping", device);
listmodel.append (out iter);
listmodel.set (iter, 0, name, 1, device, 2, ping);
}
}
Ive done so much Googleing but Vala isn't exactly the most popular language. Any help?
Like the compiler error says, you are getting a void by calling a method. Then you are trying to pass the void value into the thread constructor.
Thread<void> thread = new Thread<void>
.try ("Conntections Thread.", devices_online (listmodel));
The second cunstructor argument of Thread<T>.try () expects a delagate of type ThreadFunc<T> which you are not satisfying.
You are confusing a method call with a method delegate.
You can pass an anonymous function to fix that:
Thread<void> thread = new Thread<void>
.try ("Conntections Thread.", () => { devices_online (listmodel); });