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Questions tagged [qtcpsocket]

The QTcpSocket class, part of the Qt framework, provides a TCP socket.

TCP (Transmission Control Protocol) is a reliable, stream-oriented, connection-oriented transport protocol. It is especially well suited for continuous transmission of data.

QTcpSocket is a convenience subclass of QAbstractSocket that allows you to establish a TCP connection and transfer streams of data.

The official Qt documentation can be found here for Qt 4.8 and here for Qt 5.

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QTcpSocket gets NULL after QTcpServer::nextPendingConnection()

So I have a QTcpServer here (simplified version of Qt's Fortune Server Example). It was working fine earlier. Then I moved some things around and changed some code. Now my server crashes on start. As far as I can tell, after tcpSocket =…
DDauS
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Reading Variable length messages in Qtcp readyRead()

The following code is intended to display an Image sent over network. I sent a header of 16 bytes which I use to calculate the size of image that follows and then read that many bytes and display the image. I used the concept at this link Tcp…
Hanu
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QTcpSocket readyRead() signal emits multiple times

I'm new to Qt and currently learning to code with QTcpServer and QTcpSocket. My code to process data is like Myclass() { connect(&socket, &QTcpSocket::readyRead, this, &MyClass::processData); } void MyClass::processData() { /* Process the…
Ryan
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Qt convert QTextEdit HTML to QByteArray

I have a QTextEdit where text can be inserted as html. This text needs to be sent over a QTcpSocket. I retrieve the text from the QTextEdit as follows: QString text = ui->message->toPlainText(); socket->write(text.toLatin1().data()); This works…
wasp256
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Connection problems: TCP Socket with QTcpServer and Android client

I'm trying to make a Socket connection via TCP protocol. But my server (written in C++ and running on my PC) does not receive connection request from my client (written in Java and running on Android) ServerSocket.h (in my PC) class ServerSocket:…
josper04
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Qt Client received junk characters in addition to expected string

I am implementing a simple Qt based client which sends one command at a time to NON_QT server and server responds back. Once I get a reply from server I use it to for other purposes depending on the response Everything works as expected. Only slight…
samprat
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QTCPSocket start by timer at the same time

I have problem with synchronize(start at the same time QTCPSocket) in my application I have 10 sockets. I have to read data at the similar time to all sockets. At this moment I have something that: ///.../// if(!socket->waitForConnected(-1)) { …
Szymson
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How to wait for Qtcpsocket data without freezing the GUI in Qt?

I have implemented a **QTcpserver ** . After succesfull connection with the client( PLC), both exchange data in a 2 way hand shake. Means Server sends the data with a counter value and client will reply with the same value, the moment server…
vishnu
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How to let QTcpsocket remain connection after closing DialogWindow?

In my Qt application, I have a MainWindow and a DialogWindow. The DialogWindow is for setting up server's IP address and port. While MainWindow is for performing communication after successful connection. However, setting up QTcpSocket *socket in…
Ryan
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QTcpSocket Not Connecting

I am trying to setup a QTcpSocket connection. I am working on a simple application that involves bidirectional communication via a single TCP socket. I am testing my code by running two instances of the same application and connecting both to…
mtwister
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Qt creator cannot find, QTcpServer and QTcpSocket

Eventhough, I put 'network' in .pro file, My Qt creator cannot find QTcpSocket and QTcpServer. What should I do? I remove the Qtcreator and redownloaded already but it also did not work. My Linux version is Ubuntu 14.04 LTS and I downloaded QT…
Ray
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Making a client in Qt that tries to connect to server, and if it fails, it keeps trying until it connects

I'm using QTcpSocket for this program. void MainWindow::connectFunction() { socket->connectToHost(ip, port); if(socket->waitForConnected(2000)) { QTime time = QTime().currentTime(); ui->textBrowser->append('[' +…
user4958936
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QTcpSocket not emit any error or connected signals

I have a small project which send some data over network using QTcpSocket. The server works fine but the client(code here) seems does nothing. If I set breakpoint at tcpSocket.connectToHost("127.0.0.1",port); it does jump in, but not any slots I…
Tiana987642
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QTcpServer with android client unable to print or use data received from client

I am developing Client-Server application in C++ using Qt framework, but the clients can be android phones and computers(Qt client app) Now i'm having troubles to handle Reception of data on the server side; the server is not receiving data…
Xsmael
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QTcpServer - how to multi-thread - example is bad

I'm trying to make QTcpServer start a separate thread for each connection. There's example code available that does just that: http://doc.qt.io/qt-5/qtnetwork-threadedfortuneserver-example.html This code works by subclassing QThread. If I build my…
Philipp
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