Pidgin插件Hello world的代码分析

分析
PURPLE_PLUGINS
glib.h
version.h
notify.h
plugin_load

PurplePluginInfo

代码

/*
 * Hello World Plugin
 *
 * Copyright (C) 2004, Gary Kramlich <[email protected]>,
 *               2007, John Bailey <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02111-1301, USA.
 *
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* config.h may define PURPLE_PLUGINS; protect the definition here so that we
 * don't get complaints about redefinition when it's not necessary. */
#ifndef PURPLE_PLUGINS
# define PURPLE_PLUGINS
#endif

#include <glib.h>

/* This will prevent compiler errors in some instances and is better explained in the
 * how-to documents on the wiki */
#ifndef G_GNUC_NULL_TERMINATED
# if __GNUC__ >= 4
#  define G_GNUC_NULL_TERMINATED __attribute__((__sentinel__))
# else
#  define G_GNUC_NULL_TERMINATED
# endif
#endif

#include <notify.h>
#include <plugin.h>
#include <version.h>

/* we're adding this here and assigning it in plugin_load because we need
 * a valid plugin handle for our call to purple_notify_message() in the
 * plugin_action_test_cb() callback function */
PurplePlugin *helloworld_plugin = NULL;

/* This function is the callback for the plugin action we added. All we're
 * doing here is displaying a message. When the user selects the plugin
 * action, this function is called. */
static void
plugin_action_test_cb (PurplePluginAction * action)
{
	purple_notify_message (helloworld_plugin, PURPLE_NOTIFY_MSG_INFO,
		"Plugin Actions Test", "This is a plugin actions test :)", NULL, NULL,
		NULL);
}

/* we tell libpurple in the PurplePluginInfo struct to call this function to
 * get a list of plugin actions to use for the plugin.  This function gives
 * libpurple that list of actions. */
static GList *
plugin_actions (PurplePlugin * plugin, gpointer context)
{
	/* some C89 (a.k.a. ANSI C) compilers will warn if any variable declaration
	 * includes an initilization that calls a function.  To avoid that, we
	 * generally initialize our variables first with constant values like NULL
	 * or 0 and assign to them with function calls later */
	GList *list = NULL;
	PurplePluginAction *action = NULL;

	/* The action gets created by specifying a name to show in the UI and a
	 * callback function to call. */
	action = purple_plugin_action_new ("Plugin Action Test", plugin_action_test_cb);

	/* libpurple requires a GList of plugin actions, even if there is only one
	 * action in the list.  We append the action to a GList here. */
	list = g_list_append (list, action);

	/* Once the list is complete, we send it to libpurple. */
	return list;
}

static gboolean
plugin_load (PurplePlugin * plugin)
{
	purple_notify_message (plugin, PURPLE_NOTIFY_MSG_INFO, "Hello World!",
		"This is the Hello World! plugin :)", NULL, NULL,
		NULL);

	helloworld_plugin = plugin; /* assign this here so we have a valid handle later */

	return TRUE;
}

/* For specific notes on the meanings of each of these members, consult the C Plugin Howto
 * on the website. */
static PurplePluginInfo info = {
	PURPLE_PLUGIN_MAGIC,
	PURPLE_MAJOR_VERSION,
	PURPLE_MINOR_VERSION,
	PURPLE_PLUGIN_STANDARD,
	NULL,
	0,
	NULL,
	PURPLE_PRIORITY_DEFAULT,

	"core-hello_world",
	"Hello World!",
	DISPLAY_VERSION, /* This constant is defined in config.h, but you shouldn't use it for
		    your own plugins.  We use it here because it's our plugin. And we're lazy. */

	"Hello World Plugin",
	"Hello World Plugin",
	"John Bailey <[email protected]>", /* correct author */
	"http://helloworld.tld",


	plugin_load,
	NULL,
	NULL,

	NULL,
	NULL,
	NULL,
	plugin_actions,		/* this tells libpurple the address of the function to call
				   to get the list of plugin actions. */
	NULL,
	NULL,
	NULL,
	NULL
};

static void
init_plugin (PurplePlugin * plugin)
{
}

PURPLE_INIT_PLUGIN (hello_world, init_plugin, info)

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