标签：get DBUS variant controller BLUEZ bluez result error NULL
使用"GetManagedObjects"方法获取蓝牙控制器列表。
使用GDBUS:
/*
* hci_list_gdbus.c - List bluetooth controllers using GDBUS
* - The example uses GDBUS to get the list of bluetooth controllers using DBUS
* interfaces provided by bluez
* - If any controller is found, it prints the Name and MAC address of the controller
* gcc `pkg-config --cflags glib-2.0 gio-2.0` -o ./bin/hci_list_gdbus ./hci_list_gdbus.c `pkg-config --libs glib-2.0 gio-2.0`
* dbus-send --system --print-reply --type=method_call --dest='org.bluez' '/' org.freedesktop.DBus.ObjectManager.GetManagedObjects
*/
#include <glib.h>
#include <gio/gio.h>
GDBusConnection *con;
static const gchar* bluez_adapter_get_property(const gchar *path, const char *name)
{
GVariant *result;
GVariant *prop;
GError *error = NULL;
const gchar *address = NULL;
result = g_dbus_connection_call_sync(con,
"org.bluez",
path,
"org.freedesktop.DBus.Properties",
"Get",
g_variant_new("(ss)", "org.bluez.Adapter1", name),
NULL,
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if(error != NULL)
return NULL;
g_variant_get(result, "(v)", &prop);
g_variant_unref(result);
return g_variant_get_string(prop, NULL);
}
static void bluez_list_controllers(GDBusConnection *con,
GAsyncResult *res,
gpointer data)
{
GVariant *result = NULL;
GMainLoop *loop = NULL;
gchar *s = NULL;
GVariantIter i;
const gchar *object_path;
GVariant *ifaces_and_properties;
loop = (GMainLoop *)data;
result = g_dbus_connection_call_finish(con, res, NULL);
if(result == NULL)
g_print("Unable to get result for GetManagedObjects\n");
/* Parse the result */
if(result) {
result = g_variant_get_child_value(result, 0);
g_variant_iter_init(&i, result);
while(g_variant_iter_next(&i, "{&o@a{sa{sv}}}", &object_path, &ifaces_and_properties)) {
const gchar *interface_name;
GVariant *properties;
GVariantIter ii;
g_variant_iter_init(&ii, ifaces_and_properties);
while(g_variant_iter_next(&ii, "{&s@a{sv}}", &interface_name, &properties)) {
if(g_strstr_len(g_ascii_strdown(interface_name, -1), -1, "adapter"))
g_print("HCI Name: %s Address: %s\n", bluez_adapter_get_property(object_path, "Name"), bluez_adapter_get_property(object_path, "Address"));
g_variant_unref(properties);
}
g_variant_unref(ifaces_and_properties);
}
g_variant_unref(result);
}
g_main_loop_quit(loop);
}
int main(void)
{
GMainLoop *loop;
con = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, NULL);
if(con == NULL) {
g_print("Not able to get connection to system bus\n");
return 1;
}
loop = g_main_loop_new(NULL, FALSE);
g_dbus_connection_call(con,
"org.bluez",
"/",
"org.freedesktop.DBus.ObjectManager",
"GetManagedObjects",
NULL,
G_VARIANT_TYPE("(a{oa{sa{sv}}})"),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
(GAsyncReadyCallback)bluez_list_controllers,
loop);
g_main_loop_run(loop);
g_object_unref(con);
return 0;
}使用GDBUS Proxy:
/*
* hci_list_gdbus_proxy.c - List bluetooth controllers using GDBUS Proxy
* - The example uses GDBUS proxy to get the list of bluetooth controllers using DBUS
* interfaces provided by bluez
* - If any controller is found, it prints the Name and MAC address of the controller
* gcc `pkg-config --cflags glib-2.0 gio-2.0` -o ./bin/hci_list_gdbus_proxy ./hci_list_gdbus_proxy.c `pkg-config --libs glib-2.0 gio-2.0`
* dbus-send --system --print-reply --type=method_call --dest='org.bluez' '/' org.freedesktop.DBus.ObjectManager.GetManagedObjects
*/
#include <glib.h>
#include <gio/gio.h>
GDBusConnection *conn;
static const gchar* bluez_adapter_get_property(const gchar *path, const char *name)
{
GVariant *prop;
GDBusProxy *proxy;
GError *error = NULL;
GVariant *result;
proxy = g_dbus_proxy_new_sync(conn,
G_DBUS_PROXY_FLAGS_NONE,
NULL,
"org.bluez",
path,
"org.freedesktop.DBus.Properties",
NULL,
&error);
if(error != NULL)
return NULL;
error = NULL;
result = g_dbus_proxy_call_sync(proxy,
"Get",
g_variant_new("(ss)", "org.bluez.Adapter1", name),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if(error != NULL)
return NULL;
g_variant_get(result, "(v)", &prop);
g_variant_unref(result);
return g_variant_get_string(prop, NULL);
}
int main(void)
{
int rc = 0;
GDBusProxy *proxy;
GError *error = NULL;
GVariant *result;
const gchar *object_path;
GVariant *ifaces_and_properties;
GVariantIter i;
conn = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
if(error != NULL)
return 1;
proxy = g_dbus_proxy_new_sync(conn,
G_DBUS_PROXY_FLAGS_NONE,
NULL,
"org.bluez",
"/",
"org.freedesktop.DBus.ObjectManager",
NULL,
&error);
if(error != NULL)
return 1;
error = NULL;
result = g_dbus_proxy_call_sync(proxy,
"GetManagedObjects",
NULL,
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if(error != NULL)
return 1;
/* Parse the result */
if(result) {
result = g_variant_get_child_value(result, 0);
g_variant_iter_init(&i, result);
while(g_variant_iter_next(&i, "{&o@a{sa{sv}}}", &object_path, &ifaces_and_properties)) {
const gchar *interface_name;
GVariant *properties;
GVariantIter ii;
g_variant_iter_init(&ii, ifaces_and_properties);
while(g_variant_iter_next(&ii, "{&s@a{sv}}", &interface_name, &properties)) {
if(g_strstr_len(g_ascii_strdown(interface_name, -1), -1, "adapter"))
g_print("HCI Name: %s Address: %s\n", bluez_adapter_get_property(object_path, "Name"), bluez_adapter_get_property(object_path, "Address"));
g_variant_unref(properties);
}
g_variant_unref(ifaces_and_properties);
}
g_variant_unref(result);
}
fail:
rc = 1;
done:
if(proxy)
g_object_unref(proxy);
if(conn)
g_object_unref(conn);
if(error)
g_error_free(error);
return rc;
}
标签：get,DBUS,variant,controller,BLUEZ,bluez,result,error,NULL 来源： https://blog.csdn.net/huohongpeng/article/details/115793722
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。