CODEWITHSUNDEEP
cglibgnomegnome-3
user7163017
user7163017

Reputation:

g_timeout_add: return value is always 0

Please look in the below code.

guint id = g_timeout_add (5000,(GSourceFunc)fun(), NULL);

bool fun()
{
return false;
}

problem 1. The id vale I am getting is always 0. problem 2. As per the man page [https://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html#g-timeout-add] for the first time, fun() should get call after 5 sec but it is getting called as usual.

Could any one please help me to get the correct id vale and to call the fun() after 5 sec.

I checked the log and below error is showing.

(process:369): GLib-CRITICAL **: g_timeout_add_full: assertion 'function != NULL' failed

I gone through the online documents but didn't get appropriate answer.

Upvotes: 0

Views: 736

Answers (1)

Yann Droneaud
Yann Droneaud

Reputation: 5463

To pass a function pointer to g_timeout_add(), you should not call the function you want to pass:

guint id = g_timeout_add (5000,(GSourceFunc)fun(), NULL);

As fun() return false, once casted to (GSourceFunc) it's equivalent to NULL.

The correct invocation would be:

guint id = g_timeout_add (5000,(GSourceFunc)fun, NULL);

Upvotes: 2

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