问题描述
我试图使自己的应用程序将使用DBUS监听媒体键侏儒。我发现了一个脚本,在python工作,我想使它通过将其转换为C.我的C code构建并运行正常工作,但它不会给DBUS信号作出反应。
这条巨蟒code工作:
#!的/ usr /斌/包膜蟒蛇
通过DBUS-蟒蛇打印出来GNOME的多媒体键。
进口的GObject
进口DBUS
进口dbus.service
进口dbus.mainloop.glib
高清on_mediakey(comes_from什么):
当多媒体键pssed下跌$ P $被调用。
打印(来源于:%s的内容:%s'的)%(comes_from,什么)
如果什么[停止,播放,下一步,previous']:
打印(有一个多媒体键!)
其他:
打印(有一个多媒体键......)#设置了巧舌如簧的主循环。
dbus.mainloop.glib.DBusGMainLoop(set_as_default = TRUE)
总线= dbus.Bus(dbus.Bus.TYPE_SESSION)
bus_object = bus.get_object('org.gnome.SettingsDaemon',
'/组织/ GNOME / SettingsDaemon / MediaKeys')#这就是给我们的多媒体键。
dbus_interface ='org.gnome.SettingsDaemon.MediaKeys
bus_object.GrabMediaPlayerKeys(MyMultimediaThingy,0,
dbus_interface = dbus_interface)#connect_to_signal注册我们的回调函数。
bus_object.connect_to_signal('MediaPlayerKey pressed',
on_mediakey)#,我们开始主循环。
主循环= gobject.MainLoop()
mainloop.run()
我的C code不起作用,缺什么?
的#include< glib.h>
#包括LT&; DBUS / DBUS-glib.h>静态无效media_key_ pressed(DBusGProxy *代理,为const char *值名称,gpointer USER_DATA){
了g_print(mediakey:%S,值名称);
}INT
主(INT ARGC,字符** argv的)
{
DBusGConnection *总线;
DBusGProxy *代理;
*的GError错误= NULL;
GMainLoop *循环; g_type_init(); 循环= g_main_loop_new(NULL,FALSE); 总线= dbus_g_bus_get(DBUS_BUS_SESSION,&安培;错误);
如果(!总线){
g_printerr(无法连接到D-BUS守护程序:%S,无错误>消息);
返回1;
} 代理= dbus_g_proxy_new_for_name(公共汽车,
org.gnome.SettingsDaemon
/组织/ GNOME / SettingsDaemon / MediaKeys
org.gnome.SettingsDaemon.MediaKeys); 如果(!代理){
g_printerr(无法创建代理对象);
} dbus_g_proxy_add_signal(代理,
MediaPlayerKey pressed
G_TYPE_STRING,
G_TYPE_INVALID); dbus_g_proxy_connect_signal(代理,
MediaPlayerKey pressed
G_CALLBACK(media_key_ pressed)
空值,
空值); 了g_print(启动媒体按键侦听器);
g_main_loop_run(环);
返回0;
}
我解决了这个问题!必须调用dbus_g_proxy_call名为GrabMediaPlayerKeys(你也可以在Python code看到)
也算下来这是由第一运行此命令来完成编组:
巧舌如簧,genmarshal --header --body mediaplayerkey pressed.list> marshal.h
,然后使用它在dbus_g_object_register_marshaller功能。
完整的C code:
的#include< glib.h>
#包括LT&; DBUS / DBUS-glib.h>
#包括marshal.h静态无效media_key_ pressed(DBusGProxy *代理,为const char *值1,为const char *值2,gpointer USER_DATA){
了g_print(mediakey:%S \\ n,值2);
}INT
主(INT ARGC,字符** argv的)
{
DBusGConnection *康涅狄格州;
DBusGProxy *代理;
*的GError错误;
GMainLoop *循环; g_type_init();
错误= NULL; 康恩= dbus_g_bus_get(DBUS_BUS_SESSION,&安培;错误);
如果(!康涅狄格州){
g_printerr(无法连接到D-BUS守护程序:%S \\ n,无错误>消息);
g_error_free(错误); 返回1;
} 循环= g_main_loop_new(NULL,FALSE);
如果(!环路){
g_printerr(无法创建主循环\\ n); 返回1;
} 代理= dbus_g_proxy_new_for_name(康涅狄格州,
org.gnome.SettingsDaemon
/组织/ GNOME / SettingsDaemon / MediaKeys
org.gnome.SettingsDaemon.MediaKeys); 如果(!代理){
g_printerr(无法创建代理对象\\ n);
} 错误= NULL;
如果(!dbus_g_proxy_call(代理,
GrabMediaPlayerKeys,&安培;错误,
G_TYPE_STRING,WebMediaKeys
G_TYPE_UINT,0,
G_TYPE_INVALID,
G_TYPE_INVALID)){
g_printerr(无法抢媒体播放键:%S \\ n,无错误>消息);
} dbus_g_object_register_marshaller(
g_cclosure_user_marshal_VOID__STRING_STRING,
G_TYPE_NONE,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_INVALID); dbus_g_proxy_add_signal(代理,
MediaPlayerKey pressed
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_INVALID); dbus_g_proxy_connect_signal(代理,
MediaPlayerKey pressed
G_CALLBACK(media_key_ pressed)
空值,
空值); 了g_print(启动媒体按键侦听器\\ n);
g_main_loop_run(环); 返回0;
}
I'm trying to make my own application that will listen to the media-keys in gnome using dbus. I have found a script that works in python and I'm trying to make it work by converting it to C. My c-code builds and runs correctly but it doesn't respond to the dbus signal.
this python code works:
#!/usr/bin/env python
"""Printing out gnome multi media keys via dbus-python.
"""
import gobject
import dbus
import dbus.service
import dbus.mainloop.glib
def on_mediakey(comes_from, what):
""" gets called when multimedia keys are pressed down.
"""
print ('comes from:%s what:%s') % (comes_from, what)
if what in ['Stop','Play','Next','Previous']:
print ('Got a multimedia key!')
else:
print ('Got a multimedia key...')
# set up the glib main loop.
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.Bus(dbus.Bus.TYPE_SESSION)
bus_object = bus.get_object('org.gnome.SettingsDaemon',
'/org/gnome/SettingsDaemon/MediaKeys')
# this is what gives us the multi media keys.
dbus_interface='org.gnome.SettingsDaemon.MediaKeys'
bus_object.GrabMediaPlayerKeys("MyMultimediaThingy", 0,
dbus_interface=dbus_interface)
# connect_to_signal registers our callback function.
bus_object.connect_to_signal('MediaPlayerKeyPressed',
on_mediakey)
# and we start the main loop.
mainloop = gobject.MainLoop()
mainloop.run()
my c-code does not work, what is missing?
#include <glib.h>
#include <dbus/dbus-glib.h>
static void media_key_pressed(DBusGProxy *proxy, const char *value_name, gpointer user_data) {
g_print("mediakey: %s",value_name);
}
int
main (int argc, char **argv)
{
DBusGConnection *bus;
DBusGProxy *proxy;
GError *error = NULL;
GMainLoop *loop;
g_type_init();
loop = g_main_loop_new (NULL, FALSE);
bus = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
if (!bus) {
g_printerr("Failed to connect to the D-BUS daemon: %s", error->message);
return 1;
}
proxy = dbus_g_proxy_new_for_name(bus,
"org.gnome.SettingsDaemon",
"/org/gnome/SettingsDaemon/MediaKeys",
"org.gnome.SettingsDaemon.MediaKeys");
if(!proxy) {
g_printerr("Could not create proxy object");
}
dbus_g_proxy_add_signal(proxy,
"MediaPlayerKeyPressed",
G_TYPE_STRING,
G_TYPE_INVALID);
dbus_g_proxy_connect_signal(proxy,
"MediaPlayerKeyPressed",
G_CALLBACK(media_key_pressed),
NULL,
NULL);
g_print("Starting media key listener");
g_main_loop_run (loop);
return 0;
}
I solved the problem! Must call dbus_g_proxy_call with the name "GrabMediaPlayerKeys" (which you also can see in the python code)
Must also register a marshaller which is done by first running this command:
glib-genmarshal --header --body mediaplayerkeypressed.list > marshal.h
and then use it in the dbus_g_object_register_marshaller function.
The complete C-code:
#include <glib.h>
#include <dbus/dbus-glib.h>
#include "marshal.h"
static void media_key_pressed(DBusGProxy *proxy, const char *value1, const char *value2, gpointer user_data) {
g_print("mediakey: %s\n",value2);
}
int
main (int argc, char **argv)
{
DBusGConnection *conn;
DBusGProxy *proxy;
GError *error;
GMainLoop *loop;
g_type_init();
error = NULL;
conn = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
if (!conn) {
g_printerr("Failed to connect to the D-BUS daemon: %s\n", error->message);
g_error_free(error);
return 1;
}
loop = g_main_loop_new (NULL, FALSE);
if(!loop) {
g_printerr("Could not create mainloop\n");
return 1;
}
proxy = dbus_g_proxy_new_for_name(conn,
"org.gnome.SettingsDaemon",
"/org/gnome/SettingsDaemon/MediaKeys",
"org.gnome.SettingsDaemon.MediaKeys");
if(!proxy) {
g_printerr("Could not create proxy object\n");
}
error = NULL;
if(!dbus_g_proxy_call(proxy,
"GrabMediaPlayerKeys", &error,
G_TYPE_STRING, "WebMediaKeys",
G_TYPE_UINT, 0,
G_TYPE_INVALID,
G_TYPE_INVALID)) {
g_printerr("Could not grab media player keys: %s\n", error->message);
}
dbus_g_object_register_marshaller (
g_cclosure_user_marshal_VOID__STRING_STRING,
G_TYPE_NONE,
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_INVALID);
dbus_g_proxy_add_signal(proxy,
"MediaPlayerKeyPressed",
G_TYPE_STRING,
G_TYPE_STRING,
G_TYPE_INVALID);
dbus_g_proxy_connect_signal(proxy,
"MediaPlayerKeyPressed",
G_CALLBACK(media_key_pressed),
NULL,
NULL);
g_print("Starting media key listener\n");
g_main_loop_run (loop);
return 0;
}
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