我是dbus新手,我正在尝试捕捉网络电缆插入或拔出时生成的信号。我正在尝试使用“http://software.intel.com/en-us/articles/detecting-network-connectivity-using-d-bus中给出的示例代码。
我在dbus_message_中使用的信号名是_signal()来获取信息。请提供任何可以清除我的概念的示例代码。
我的代码是:
enter code here
#include<stdio.h>
#include<dbus/dbus.h>
#include <gdbus.h>
#include<stdbool.h>
#include<unistd.h>
#include<stdlib.h>
#include<dbus/dbus-glib-bindings.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>
#define PLATFORM_SERVICE "org.freedesktop.NetworkManager"
#define PLATFORM_PATH "/org/freedesktop/NetworkManager"
#define PLATFORM_CONNECTION_IF "org.freedesktop.NetworkManager"
main()
{
DBusMessage* msg;
DBusConnection* conn;
DBusError err;
printf("Listening for signals\n");
// initialise the errors
dbus_error_init(&err);
//connect to the bus and check for errors
conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
if (dbus_error_is_set(&err))
{
fprintf(stderr, "Connection Error (%s)n", err.message);
dbus_error_free(&err);
}
if (NULL == conn)
{
printf("Error in connection\n");
exit(1);
}
dbus_bus_add_match(conn, "type='signal',interface='org.freedesktop.NetworkManager'", &err);
dbus_connection_flush(conn);
if (dbus_error_is_set(&err))
{
fprintf(stderr, "Match Error (%s)n", err.message);
exit(1);
}
printf("Match rule sent\n");
g_message("Listening to D-BUS signals using a connection filter");
// loop listening for signals being emmitted
while (true)
{
printf("in while \n");
// non blocking read of the next available message
dbus_connection_read_write(conn,0);
msg = dbus_connection_pop_message(conn);
// loop again if we haven't read a message
if (NULL == msg)
{
sleep(1);
continue;
}
if (dbus_message_is_signal(msg, PLATFORM_CONNECTION_IF,"PropertiesChanged"))
printf("Received signal propertyChanged \n");
if (dbus_message_is_signal(msg, PLATFORM_CONNECTION_IF, "DeviceRemoved"))
printf("Received signal %s\n", "Device changed");
// free the message
dbus_message_unref(msg);
}
}
我可以得到属性改变的信号,但如何得到其他信号。
最佳答案
查看networkmanager规范,它为您提供了界面的所有细节。
您可能感兴趣的信号将是“DeviceAdded”和“DeviceRemoved”,以发现设备何时来时走(电缆插入和拔出)。您还可以深入到org.freedesktop.networkmanager.device以获取“propertieschanged”信号并获取“state”属性等。
关于c - 在Linux中的网络管理器的接口(interface)“org.freedesktop.NetworkManager.Device”上生成的信号名称,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15833637/