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The remaining argument is the pointer to send as the argument to attached callbacks If the callback took more than one argument, they would be included in subsequent arguments to g_signal_emit() If the callback has a return value, the final argument is a pointer to a variable in which to store it Elsewhere, code attaches to the "stopped" signal: g_signal_connect(G_OBJECT(dialog), "stopped", G_CALLBACK(stopped_cb), NULL); When the signal is emitted, the stopped_cb callback is called: static void stopped_cb (GtkWidget *widget, GaimXfer *xfer) { gaim_notify_info(NULL, NULL, "You stopped this transfer", NULL); } This results in the alert message seen in Figure 6-3 popping up when the Stop button is pressed..

Within the $TNS_ADMIN/tnsname.ora file, an alias is created for FNDFS_nodename, as seen in the following excerpt from the tnsnames.ora file: FNDFS_myappsserver= (DESCRIPTION= (ADDRESS=(PROTOCOL=TCP) (HOST=myappsserver) (PORT=19005)) (CONNECT_DATA=(SID=FNDFS)) ) The tnsnames.ora file defines connections to the FNDFS Listener, and it contains an address list of all services that you can connect to from the client.

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The other features of GObject outlined earlier are straightforward to use. Setting and retrieving arbitrary data is simple as can be. To set data, call the following: g_object_set_data(object, "key", data); The key argument is the key for this data. If data is already stored with this key, it will be overwritten. Data is defined as a void pointer. If you need to store a nonpointer value, you can use GINT_TO_POINTER(data) and GPOINTER_TO_INT(data), which are two macros that will ensure the int is properly stored within the pointer. Retrieving data is simple: data = g_object_get_data(object, "key"); This will return the associated data, or NULL if no data is set. Reference counting is slightly more complex, but it s rare that you will need to use it often, as it happens mostly internally. You can increase the reference count with g_object_ref() and decrease it with g_object_unref(). When manipulating the refcount of a GObject is necessary, that object s documentation will usually specify so.

If you don t know any Python, or even if you ve never done any programming before, don t worry. Python is easy to learn, and you don t need to know much of it to get started with Django. In fact, many first-time Django users learn Python and Django at the same time. (When I first started with Python, I learned the basics in a weekend by reading online tutorials.) I ll call attention to important Python concepts when needed, but I recommend that you look at a Python tutorial before going very far into this book. The Python documentation index at http://python.org/doc/ features a good list of tutorials and books (several of which are available for free online) to help you learn the basics of Python. (I d recommend knowing at least how Python functions and classes work.) You ll be able to pick up the rest as you go along. If you re looking for a good reference to keep handy as you re learning Django, check out Beginning Python: From Novice to Professional, Second Edition by Magnus Lie Hetland and Dive Into Python by Mark Pilgrim (both from Apress).

Now that you understand what is involved in creating GtkCellRendererTransfer, review what you need to do to create a new GObject. Create structs for your instance and your class. You must have a struct for both your class and your instance. These must inherit from the direct parent. In the case of GtkCellRendererTransfer, its structs inherit from GtkCellRenderer. Register a type from a _get_type() function. Create a GTypeInfo struct and register this with g_type_register_static(). Do this with a singleton pattern to avoid registering the type more than once. Your GTypeInfo will contain the size of the structs created and, optionally, pointers to functions that initialize and deinitialize data. Create functions to initialize or deinitialize your class and instances. If you need to set default values for your instances data fields, create an instance_init function and set it in your GTypeInfo struct. The class_init function is the appropriate place to install properties and signals and also to override the parent class s default behaviors. Override the parent class s default behaviors. This is the best way to introduce new behaviors into your new widget while building on old ones.

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