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为什么信号连接会使socketclient对象无效?

glibmm libsigc++ gio glib c++

0

Jens Mühlenhoff · 技术社区 · 6 年前

我试图通过giomm从gio与socketclient类建立tcp/tls连接。

一切都很好,直到我连接到 SocketClient::event_signal () 信号与 sigc::ptr_fun () .

下面是一个精简的示例代码,演示了该问题:

#include <giomm/error.h>
#include <giomm/init.h>
#include <giomm/networkaddress.h>
#include <giomm/socketclient.h>
#include <glibmm/main.h>
#include <iostream>

void socket_client_event (Gio::SocketClientEvent event,
              const Glib::RefPtr<Gio::SocketConnectable> &connectable,
              const Glib::RefPtr<Gio::IOStream> &connection) {
}

int main () {
  auto loop = Glib::MainLoop::create ();
  Gio::init ();
  auto network_address = Gio::NetworkAddress::create ("www.example.org", 437);
  auto socket_client = Gio::SocketClient::create ();
  socket_client->set_tls (true);
  socket_client->signal_event ().connect (sigc::ptr_fun (&socket_client_event));
  Glib::RefPtr<Gio::SocketConnection> socket_connection;
  try {
    socket_connection = socket_client->connect (network_address);
  }
  catch (const Gio::TlsError &e) {
    std::cerr << e.what (). c_str () << std::endl;
    return 1;
  }
  catch (const Gio::Error &e) {
    std::cerr << e.what (). c_str () << std::endl;
    return 1;
  }

  loop->run ();
}

当 connect () 方法被称为i get this console output:

(process:9046): GLib-GIO-CRITICAL **: g_socket_connection_connect: assertion 'G_IS_SOCKET_CONNECTION (connection)' failed

(process:9046): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

(process:9046): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed

(process:9046): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed

然后一个分割错误使程序死掉。

我打开了g_debug=all并在第一个错误时停止,但是根据回溯,这是 连接() 方法。

奇怪的是,注释掉连接信号处理程序的源代码行可以解决问题。

那么我在这里连接信号时做错了什么?为什么连接后套接字客户端无效?

1 回复 | 直到 6 年前

1

0

Jens Mühlenhoff 6 年前

那里 seems to be a bug 在glibmm或gio中的引用计数中。

如果在问题消失时手动引用对象:

void socket_client_event (Gio::SocketClientEvent event,
              const Glib::RefPtr<Gio::SocketConnectable> &connectable,
              const Glib::RefPtr<Gio::IOStream> &connection) {
  // Workaround for reference counting problems
  if (connectable) {
    connectable->reference ();
  }
  if (connection) {
    connection->reference ();
  }
}