将QTcpSocket绑定到特定端口 [英] Bind a QTcpSocket to a specific port
问题描述
我正在通过QTcpSocket
连接到QTcpServer
.我可以在服务器端指定侦听端口,但是客户端会为其连接选择一个随机端口.我尝试使用方法QAbstractSocket::bind
,但这没什么区别.
I am connecting through a QTcpSocket
to a QTcpServer
. I can specify the listening port on the Server side, but the client chooses a random port for its connection. I have tried to use the method QAbstractSocket::bind
but that made no difference.
这是我的代码:
void ConnectionHandler::connectToServer() {
this->socket->bind(QHostAddress::LocalHost, 2001);
this->socket->connectToHost(this->ip, this->port);
if (!this->socket->waitForConnected()) {
this->socket->close();
this->errorMsg = this->socket->errorString();
}
qDebug() << this->socket->localPort();
}
有人知道我想念什么吗?
Does anyone know what I'm missing?
推荐答案
我将您的代码重新编写为 MCVE :
I reformulated your code into a MCVE:
#include <QDebug>
#include <QHostAddress>
#include <QTcpSocket>
#include <memory>
int main()
{
std::unique_ptr<QTcpSocket> socket(new QTcpSocket);
socket->bind(QHostAddress::LocalHost, 2001);
qDebug() << socket->localPort(); // prints 2001
socket->connectToHost(QHostAddress::LocalHost, 25);
qDebug() << socket->localPort(); // prints 0
}
为什么connectToHost
将本地端口重置为0?
Why does connectToHost
reset the local port to 0?
这似乎是Qt中的错误.在版本5.2.1中,QAbstractSocket::connectToHost
包含
This appears to be a bug in Qt. In version 5.2.1, QAbstractSocket::connectToHost
contains
d->state = UnconnectedState;
/* ... */
d->localPort = 0;
d->peerPort = 0;
在5.5版中,该名称已更改为
In version 5.5, this has changed to
if (d->state != BoundState) {
d->state = UnconnectedState;
d->localPort = 0;
d->localAddress.clear();
}
因此升级Qt可能会解决该问题.
So it's likely that upgrading your Qt will fix the issue.
这篇关于将QTcpSocket绑定到特定端口的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!