【发布时间】：2017-10-15 15:55:06
【问题描述】：
当尝试列出网络属性 - https://w1.fi/wpa_supplicant/devel/dbus.html#dbus_network 使用 dbus-cpp 时，我收到了一些关于缺少 operator== for core::dbus::types::Variant 的错误
/usr/include/core/dbus/impl/object.h:185:17: required from ‘std::shared_ptr<core::dbus::Property<PropertyDescription> > core::dbus::Object::get_property() [with PropertyDescription = fi::w1::wpa_supplicant1::Network::Properties::Propertiez]’ /home/martin/ClionProjects/ang-wifi-controller/src/wpasupplicantclient.cpp:149:118: required from here /usr/include/c++/6/bits/stl_pair.h:364:51: error: no match for ‘operator==’ (operand types are ‘const core::dbus::types::Variant’ and ‘const core::dbus::types::Variant’)
{ return __x.first == __y.first && __x.second == __y.second; }
我的代码基于 dbus-cpp 示例和 http://quaintous.com/2015/08/30/cpp11-dbus/，但它们仅提供有限的帮助。 表示Properties属性的代码如下：
namespace fi {
namespace w1 {
struct wpa_supplicant1 {
struct Network {
struct Properties {
struct Propertiez {
inline static std::string name() { return "Properties"; };
typedef Network Interface;
typedef std::map<std::string, core::dbus::types::Variant> ValueType;
static const bool readable = true;
static const bool writable = true;
};
};
};
.cpp 中的违规行是networkProxy->get_property<fi::w1::wpa_supplicant1::Network::Properties::Propertiez>();
我发现这个问题已经在https://answers.launchpad.net/ubuntu/+source/dbus-cpp/+question/593271 提出过，但没有人提供任何建议。通过apt-cache rdepends libdbus-cpp5 列出的包代码也没有产生任何结果。
我尝试弄乱ValueType，但这一切都导致了运行时错误，因为预期的结果可能真的是地图。老实说，这对我来说似乎是库中的一个错误，但由于这一定是一个明显的用例，我试图找出我使用库时的错误。那我做错了什么？
编辑：由于我没有收到任何回复，因此我包含了最少的样本。
#include <core/dbus/bus.h>
#include <core/dbus/object.h>
#include <core/dbus/property.h>
#include <core/dbus/service.h>
#include <core/dbus/result.h>
#include <core/dbus/asio/executor.h>
#include <core/dbus/interfaces/properties.h>
#include <core/dbus/types/stl/string.h>
#include <core/dbus/types/stl/tuple.h>
#include <core/dbus/types/stl/vector.h>
#include <core/dbus/types/struct.h>
#include <core/dbus/types/variant.h>
using namespace std::chrono_literals;
using DBusDict = std::map<std::string, core::dbus::types::Variant>;
namespace fi {
namespace w1 {
struct wpa_supplicant1
{
struct GetInterface {
typedef wpa_supplicant1 Interface;
static const std::string &name()
{
static const std::string s("GetInterface");
return s;
}
inline static const std::chrono::milliseconds default_timeout() { return 1s; }
};
struct Iface
{
struct AddNetwork {
typedef Iface Interface;
static const std::string &name()
{
static const std::string s("AddNetwork");
return s;
}
inline static const std::chrono::milliseconds default_timeout() { return 1s; }
};
struct Properties
{
struct Networks
{
inline static std::string name()
{ return "Networks"; };
typedef Iface Interface;
typedef std::vector<core::dbus::types::ObjectPath> ValueType;
static const bool readable = true;
static const bool writable = false;
};
};
};
struct Network
{
struct Properties
{
struct Propertiez
{
inline static std::string name()
{ return "Properties"; };
typedef Network Interface;
typedef DBusDict ValueType;
static const bool readable = true;
static const bool writable = true;
};
};
};
};
};
};
namespace core {
namespace dbus {
namespace traits {
template <> struct Service<fi::w1::wpa_supplicant1> {
inline static const std::string &interface_name()
{
static const std::string s("fi.w1.wpa_supplicant1");
return s;
}
};
template <> struct Service<fi::w1::wpa_supplicant1::Iface> {
inline static const std::string &interface_name()
{
static const std::string s("fi.w1.wpa_supplicant1.Interface");
return s;
}
};
template <> struct Service<fi::w1::wpa_supplicant1::Network> {
inline static const std::string &interface_name()
{
static const std::string s("fi.w1.wpa_supplicant1.Network");
return s;
}
};
}
}
}
int main()
{
//bus
auto systemBus = std::make_shared<core::dbus::Bus>(core::dbus::WellKnownBus::system);
systemBus->install_executor(core::dbus::asio::make_executor(systemBus));
auto busThread = std::thread(std::bind(&core::dbus::Bus::run, systemBus));
//service
auto wpaService = core::dbus::Service::use_service<fi::w1::wpa_supplicant1>(systemBus);
auto wpaObjectPath = core::dbus::types::ObjectPath("/fi/w1/wpa_supplicant1");
auto wpaRootProxy = wpaService->object_for_path(wpaObjectPath);
//iface
auto ifacePath = wpaRootProxy->transact_method<fi::w1::wpa_supplicant1::GetInterface,
core::dbus::types::ObjectPath,
std::string>("wlan0"); //change this to your own wireless interface
auto wpaIfaceProxy = wpaService->object_for_path(ifacePath.value());
auto networkPaths = wpaIfaceProxy->get_property<fi::w1::wpa_supplicant1::Iface::Properties::Networks>();
//network
std::string ssid("network");
std::string password("password");
DBusDict args = {
{"ssid", core::dbus::types::Variant::encode(ssid)},
{"psk", core::dbus::types::Variant::encode(password)},
};
auto networkPath = wpaIfaceProxy->transact_method<fi::w1::wpa_supplicant1::Iface::AddNetwork,
core::dbus::types::ObjectPath,
DBusDict>(args);
auto networkProxy = wpaService->object_for_path(networkPath.value());
//get properties - uncomment line below to get compiler errors
//auto netProps = networkProxy->get_property<fi::w1::wpa_supplicant1::Network::Properties::Propertiez>();
while (true) {
continue;
}
}
编译使用：g++ $(pkg-config --cflags dbus-1 dbus-cpp) ./main.cpp $(pkg-config --libs dbus-1 dbus-cpp) -lpthread
【问题讨论】：
-
+1 提示使用 apt-cache rdepends libdbus-cpp5。我一直在考虑使用这个 d-bus 绑定，但似乎支持很少。我想使用 Introspectable 接口，但那家伙甚至没有开箱即用地编译。
-
FWIW，我在 Ubuntu 14.04 上工作并尝试过：apt-cache rdepends libdbus-cpp2，它提供了几个服务。我现在正在研究其中的一些来源（例如 libubuntu-location-service-dev）。
标签： c++ dbus wpa-supplicant