How do I remove the data I have attached to an object?

When attaching the data to the object, you can use the gtk_object_set_data_full() function. The three first arguments of the function are the same as in gtk_object_set_data(). The fourth one is a pointer to a callback function which is called when the data is destroyed. The data is destroyed when you:

• destroy the object

• replace the data with a new one (with the same key)

• replace the data with NULL (with the same key)