从Qt上的UNIX域套接字(QLocalSocket）读取

Reading from a UNIX domain socket (QLocalSocket) on Qt

本文关键字：QLocalSocket 读取 套接字 Qt 上的 UNIX      更新时间：2023-10-16

我在从UNIX域套接字读取时遇到问题，服务器应用程序是基于Python的，我需要实现IPC以作为客户端与Qt应用程序进行通信。服务器应用程序经过测试，并使用 Python 客户端应用程序。这是我在Qt客户端拥有的内容：

优尼克斯.cpp 

#include "unixsocket.h"
#include <stdio.h>
UnixSocket::UnixSocket(QObject *parent) :
QObject(parent)
{
this->socket = new QLocalSocket (this);
}
UnixSocket::~UnixSocket(){}
void UnixSocket::Test ()
{
connect (this->socket, SIGNAL(connected()), this, SLOT(connected_callback()));
connect (this->socket, SIGNAL(disconnected()), this, SLOT(disconnected_callback()));
connect (this->socket, SIGNAL(readyRead()), this, SLOT(readyRead_callback()));
connect (this->socket, SIGNAL(bytesWritten(qint64)), this, SLOT(bytesWritten_callback(qint64)));
qDebug() << "Connecting...";
socket->connectToServer(ADAPTER_SOCKET);
if (!socket->waitForConnected(1000))
{
qDebug() << "Error: " << this->socket->errorString();
}
else
{
in.setDevice(socket);
in.setVersion(QDataStream::Qt_5_8);
this->blockSize = 0;
}
}
void UnixSocket::connected_callback()
{
qDebug() << "Connected to " << socket->fullServerName();
}
void UnixSocket::disconnected_callback()
{
qDebug() << "Disconnected!";
}
void UnixSocket::bytesWritten_callback(qint64 bytes)
{
qDebug() << "We wrote: " << bytes;
}
void UnixSocket::readyRead_callback()
{
qDebug() << "Reading...";
qDebug() << "Block Size: " << this->blockSize;
if (this->blockSize == 0) {
// Relies on the fact that QDataStream serializes a quint32 into
// sizeof(quint32) bytes
if (socket->bytesAvailable() < (int)sizeof(quint32))
return;
in >> this->blockSize;
}
if (socket->bytesAvailable() < this->blockSize || in.atEnd())
return;
QString recvd_data;
in >> recvd_data;
qDebug() << recvd_data;
}

Unixsocket.h

#ifndef UNIXSOCKET_H
#define UNIXSOCKET_H
#include <QObject>
#include <QAbstractSocket>
#include <QLocalSocket>
#include <QtNetwork>
#include <QIODevice>
#include <QDebug>
#include <QTextStream>
#include <QDataStream>
#define ADAPTER_SOCKET "/opt/adapter/socket"

class UnixSocket: public QObject
{
Q_OBJECT
public:
explicit UnixSocket(QObject *parent = 0);
~UnixSocket();
void Test ();
signals:
public slots:
void connected_callback();
void disconnected_callback();
void bytesWritten_callback (qint64 bytes);
void readyRead_callback();
private:
QLocalSocket *socket;
QDataStream in;
quint32 blockSize;
};
#endif // UNIXSOCKET_H

和主.cpp到火类：

int main(int argc, char* argv[])
{
UnixSocket mUnixSocket;
mUnixSocket.Test();
while (1);
return 1;
}

现在，Unix域套接字连接工作正常。所以，我收到"连接"消息。而且我确定服务器正在异步发送一些数据，但由于某种原因，我的程序根本没有进入readyRead_callback。我需要有关如何解决此问题的指示。任何帮助都非常感谢。

qt信号需要存在于Qt事件循环中，在您的情况下，您没有任何信号，因此它对您不起作用，因此请将代码更改为：

int main(int argc, char *argv[]) { 
QCoreApplication a(argc, argv);
UnixSocket mUnixSocket; 
mUnixSocket.Test(); 
return a.exec(); 
}

如何在服务器中侦听Unix域套接字？ 使用QLocalServer，但不调用onNewConnection

mServer = new QLocalServer;
connect(mServer, SIGNAL(newConnection()), this, SLOT(onNewConnection()));
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