QTcpServer监听地址0.0.0.0

Question

我有下面的启动QTcpServer的代码块

void UeConnectionServer::ueStartConnectionServer()
{
    QString logText=QString();

    if(!this->isListening())
    {
        if(!this->listen(QHostAddress::Any,
                         1234))
        {
            logText=tr("[ERROR]").append(" ")
                                 .append(QDateTime::currentDateTime().toString("dd.MM.yyyy hh:mm:ss:zzz"))
                                 .append(" ")
                                 .append(this->errorString());

            emit this->ueSignalEventInfoAdded(logText);
        }
        else
        {
            logText=tr("[INFO]").append(" ")
                                .append(QDateTime::currentDateTime().toString("dd.MM.yyyy hh:mm:ss:zzz"))
                                .append(" ")
                                .append(tr("Server started on address ")
                                .append(this->serverAddress().toString())
                                .append(":")
                                .append(QString::number(this->serverPort())));

            emit this->ueSignalEventInfoAdded(logText);
        }   // if
    }   // if
}   // ueStartConnectionServer

服务器已成功启动，但是，下面的日志行显示它正在侦听地址0.0.0.0

信息25.03.2016 12:02:36:265服务器在地址0.0.0.0:1234上启动

为什么QTcpServer不获得工作站的IP，对于我的情况192.168.0.100。我使用的是Linux，下面是ifconfig输出：

eth0      Link encap:Ethernet  HWaddr 1c:6f:65:92:82:02  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:18984 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18984 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3979893 (3.9 MB)  TX bytes:3979893 (3.9 MB)

vmnet1    Link encap:Ethernet  HWaddr 00:50:56:c0:00:01  
          inet addr:172.16.115.1  Bcast:172.16.115.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:327 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

vmnet8    Link encap:Ethernet  HWaddr 00:50:56:c0:00:08  
          inet addr:192.168.77.1  Bcast:192.168.77.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:326 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 6c:fd:b9:2d:cc:90  
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::6efd:b9ff:fe2d:cc90/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1047445 errors:0 dropped:0 overruns:0 frame:0
          TX packets:583455 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1267590187 (1.2 GB)  TX bytes:99542638 (99.5 MB)

这可能是QTcpServer试图从列表中的first网络接口和而不是active one获取IP address的问题吗？

Answer 1

因为QT文档这么说：QHostAddress

QHostAddress::Any: IPv4任意地址。相当于QHostAddress("0.0.0.0")。

您不必担心，您的服务器侦听它的所有IP地址。您有多个网络接口。如果您指定了192.168.0.100，您可以从所有这些服务器中找到它们，您将将服务器限制在一个网络接口上。