如何使用dbus/gio向bluez注册配置文件

Question

我正试图通过D-Bus/Gio向bluez注册一个配置文件。当我调用RegisterProfile时，一切都正常。我检查了我的GError，它是NULL，并且我的返回值是一个空的GVariant。我尝试了很多方法，但这是我的最新代码。当我运行它时，它会打印"g_dbus_connection_call_sync successed"，但我无法使用D-feet在D-Bus中看到我的新配置文件，也无法使用我的测试设备连接到它。我知道测试设备上的代码是有效的，或者至少可以直接使用bluez，但我正在努力找出如何将bluez与D-Bus一起使用。

这是我的代码.h文件：

#ifndef BT_SERVER_H
#define BT_SERVER_H
#include <glib.h>
#include <gio/gio.h>
// ---------------------------------------------------------------------------
class BTProfile
{
public:
BTProfile();
void init();
void destroy();
static void method_call(GDBusConnection *connection,
const gchar *sender, const gchar *object_path,
const gchar *interface_name, const gchar *method_name,
GVariant *parameters, GDBusMethodInvocation *invocation,
gpointer user_data);
static GVariant *get_property(GDBusConnection *connection,
const gchar *sender, const gchar *object_path,
const gchar *interface_name, const gchar *property_name,
GError **error, gpointer user_data);
static gboolean set_property(GDBusConnection *connection,
const gchar *sender, const gchar *object_path,
const gchar *interface_name, const gchar *property_name,
GVariant *value, GError **error, gpointer userData);
protected:
GDBusConnection *bus_connection;
};

这是我的.cpp文件：

#include <stdio.h>
#include "bt_server.h"
static const char *serial_service_class_uuid =
"00001101-0000-1000-8000-00805F9B34FB";
static const char *my_service_uuid =
"E62C4DCA-9ABC-11E5-8994-FEFF819CDC9F";
static const gchar btp_introspection_xml[] =
"<node>"
"  <interface name='org.bluez.Profile1'>"
"    <method name='Release' />"
"    <method name='NewConnection'>"
"      <arg type='o' name='device' direction='in' />"
"      <arg type='h' name='fd' direction='in' />"
"      <arg type='a{sv}' name='fd_properties' direction='in' />"
"    </method>"
"    <method name='RequestDisconnection'>"
"      <arg type='o' name='device' direction='in' />"
"    </method>"
"  </interface>"
"</node>";
static const GDBusInterfaceVTable btp_interface_vtable =
{
BTProfile::method_call,
BTProfile::get_property,
BTProfile::set_property
};
BTProfile::BTProfile() : bus_connection(NULL)
{
}
// ---------------------------------------------------------------------------
void BTProfile::init()
{
GError *error = NULL;
GDBusNodeInfo *introspection = g_dbus_node_info_new_for_xml(
btp_introspection_xml, &error);
if (!error)
{
GDBusInterfaceInfo *interface_info = g_dbus_node_info_lookup_interface(
introspection, "org.bluez.Profile1");
bus_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
if (!error)
{
g_dbus_connection_register_object(bus_connection,
"/org/bluez/myprofile", interface_info, &btp_interface_vtable,
this, NULL, &error);
if (!error)
{
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE_DICTIONARY);
g_variant_builder_add(&builder, "{sv}", "Name",
g_variant_new("s", "myprofile"));
g_variant_builder_add(&builder, "{sv}", "Service",
g_variant_new("s", serial_service_class_uuid));
g_variant_builder_add(&builder, "{sv}", "Channel",
g_variant_new("q", 1));
g_variant_builder_add(&builder, "{sv}", "RequireAuthentication",
g_variant_new("b", FALSE));
g_variant_builder_add(&builder, "{sv}", "Role",
g_variant_new("s", "client"));
g_variant_builder_add(&builder, "{sv}", "Version",
g_variant_new("q", 1));
g_variant_builder_add(&builder, "{sv}", "AutoConnect",
g_variant_new("b", true));
g_dbus_connection_call_sync(bus_connection, "org.bluez",
"/org/bluez", "org.bluez.ProfileManager1",
"RegisterProfile", g_variant_new("(osa{sv})",
"/org/bluez/myprofile", my_service_uuid, &builder),
NULL, G_DBUS_CALL_FLAGS_NONE, G_MAXINT, NULL, &error);
if (!error)
{
g_print("g_dbus_connection_call_sync succeededn");
}
else
{
g_print("g_dbus_connection_call_sync failed: %sn",
error->message);
g_error_free(error);
}
}
else
{
g_print("g_dbus_connection_register_object failed: %sn",
error->message);
g_error_free(error);
}
}
else
{
g_print("g_bus_get_sync failed: %sn", error->message);
g_error_free(error);
}
}
else
{
g_print("g_dbus_node_info_new_for_xml failed: %sn", error->message);
g_error_free(error);
}
}
// ---------------------------------------------------------------------------
void BTProfile::destroy()
{
if (bus_connection)
{
g_object_unref(bus_connection);
}
}
// ---------------------------------------------------------------------------
void BTProfile::method_call(GDBusConnection *connection, const gchar *sender,
const gchar *object_path, const gchar *interface_name,
const gchar *method_name, GVariant *parameters,
GDBusMethodInvocation *invocation, gpointer user_data)
{
g_print("handle_method_call: calledn");
g_dbus_method_invocation_return_value(invocation, NULL);
}
// ---------------------------------------------------------------------------
GVariant *BTProfile::get_property(GDBusConnection *connection,
const gchar *sender, const gchar *object_path, const gchar *interface_name,
const gchar *property_name, GError **error, gpointer user_data)
{
g_print("get_property: calledn");
return NULL;
}
// ---------------------------------------------------------------------------
gboolean BTProfile::set_property(GDBusConnection *connection,
const gchar *sender, const gchar *object_path, const gchar *interface_name,
const gchar *property_name, GVariant *value, GError **error,
gpointer userData)
{
g_print("set_property: calledn");
return false;
}

我有点不知所措，因为我没有得到错误信息。谢谢大家。

编辑：在四处挖掘后，我发现了dbus bluetooth.conf文件，这是我的：

<!-- This configuration file specifies the required security policies
for Bluetooth core daemon to work. -->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- ../system.conf have denied everything, so we just punch some holes -->
<policy user="root">
<allow own="org.bluez"/>
<allow send_destination="org.bluez"/>
<allow send_interface="org.bluez.Agent1"/>
<allow send_interface="org.bluez.MediaEndpoint1"/>
<allow send_interface="org.bluez.MediaPlayer1"/>
<allow send_interface="org.bluez.ThermometerWatcher1"/>
<allow send_interface="org.bluez.AlertAgent1"/>
<allow send_interface="org.bluez.Profile1"/>
<allow send_interface="org.bluez.HeartRateWatcher1"/>
<allow send_interface="org.bluez.CyclingSpeedWatcher1"/>
<allow send_interface="org.bluez.GattCharacteristic1"/>
<allow send_interface="org.bluez.GattDescriptor1"/>
<allow send_interface="org.bluez.ProfileManager1"/>
<allow send_interface="org.bluez.Device1"/>
<allow send_interface="org.freedesktop.DBus.ObjectManager"/>
<allow send_interface="org.freedesktop.DBus.Properties"/>
</policy>
<policy at_console="true">
<allow send_destination="org.bluez"/>
</policy>
<!-- allow users of lp group (printing subsystem) to 
communicate with bluetoothd -->
<policy group="lp">
<allow send_destination="org.bluez"/>
</policy>
<policy context="default">
<deny send_destination="org.bluez"/>
</policy>
</busconfig>

我添加了ProfileManager 1和Device1，但仍然没有成功。有人知道我在这里错过了什么吗？我可以使用直接bluez注册和使用配置文件，所以我知道这是一个bluez/dbus问题。

Answer 1

我相信我已经想通了。不管怎样，我还是让它工作。在反复阅读了这些例子之后，我最终这样做了：

1：拥有一个总线名称g_bus_own_name。

2:在我的on_bus_acquired回调中，我使用该GDBusConnection作为g_dbus_connection_register_object的参数(而不是尝试自己创建GDBusConnection)

3：调用RegisterProfile方法

如果有人感兴趣，我可以发布代码。

现在一切似乎都正常了。另一件让我感到困惑的事情是RegisterProfile的参数。我使用SerialUUID进行连接，但一开始我还将角色参数设置为"服务器"。它导致我的个人资料拒绝连接。我认为这个参数只适用于不同类型的配置文件，但我不确定。有人知道吗？