Solved QTcpServer listen QHostAddress::Any network operation timed out
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Using Desktop QT 5.9.1 Mingw 32bit, QTcpServer listen on QHostAddress::Any, sometimes it works, sometimes it reports "network operation timed out".
The OS is windows 10Edit:
There was an error message in the Application out window:
QSocks5SocketEnginePrivate::_q_controlSocketReadNotification: Unexpectedly received data while in state=10 and mode=2This seems to be a bug of QTcpServer.
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@mikelij
We need a little more knowledge.
Can you share full code?
https://forum.qt.io/topic/54727/solved-network-problems-qtcpsocket-qtcpserver/5 -
Does upgrading to Qt 5.9.2 solve the problem?
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@Taz742 said in QTcpServer listen QHostAddress::Any network operation timed out:
@mikelij
We need a little more knowledge.
Can you share full code?
https://forum.qt.io/topic/54727/solved-network-problems-qtcpsocket-qtcpserver/5This is my code.
void ServerSocket::startListening() { while (!tcpServer.isListening() && !tcpServer.listen(QHostAddress::Any, this->serverPort)) { QMessageBox::StandardButton ret = QMessageBox::critical(NULL, tr("Loopback"), tr("Unable to start the test: %1.") .arg(tcpServer.errorString()), QMessageBox::Retry | QMessageBox::Cancel); if (ret == QMessageBox::Cancel) return; } connect(&tcpServer, SIGNAL(newConnection()),this, SLOT(acceptConnection())); }
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@VRonin
Tried 5.9.2. It did not work. Still got the "network operation timed out" error. -
Ok, let's try not to stop the event loop:
void ServerSocket::startListening() { while (!tcpServer.listen(QHostAddress::Any, this->serverPort)) { QMessageBox::StandardButton ret = QMessageBox::critical(NULL, tr("Loopback"), tr("Unable to start the test: %1.") .arg(tcpServer.errorString()), QMessageBox::Retry | QMessageBox::Cancel); if (ret == QMessageBox::Cancel) return; } connect(&tcpServer, SIGNAL(newConnection()),this, SLOT(acceptConnection())); }
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@VRonin
Did not work. Still the same error. -
@Taz742
My code is copied from the official loopback example.
//dialog.h
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/#ifndef DIALOG_H
#define DIALOG_H#include <QDialog>
#include <QTcpServer>
#include <QTcpSocket>QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QProgressBar;
class QPushButton;
class QTcpServer;
class QTcpSocket;
class QAction;
QT_END_NAMESPACEclass Dialog : public QDialog
{
Q_OBJECTpublic:
Dialog(QWidget *parent = 0);public slots:
void start();
void acceptConnection();
void startTransfer();
void updateServerProgress();
void updateClientProgress(qint64 numBytes);
void displayError(QAbstractSocket::SocketError socketError);private:
QProgressBar *clientProgressBar;
QProgressBar *serverProgressBar;
QLabel *clientStatusLabel;
QLabel *serverStatusLabel;QPushButton *startButton; QPushButton *quitButton; QDialogButtonBox *buttonBox; QTcpServer tcpServer; QTcpSocket tcpClient; QTcpSocket *tcpServerConnection; int bytesToWrite; int bytesWritten; int bytesReceived;
};
#endif
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/#include <QtWidgets>
#include <QtNetwork>#include "dialog.h"
static const int TotalBytes = 50 * 1024 * 1024;
static const int PayloadSize = 64 * 1024; // 64 KBDialog::Dialog(QWidget *parent)
: QDialog(parent)
{
clientProgressBar = new QProgressBar;
clientStatusLabel = new QLabel(tr("Client ready"));
serverProgressBar = new QProgressBar;
serverStatusLabel = new QLabel(tr("Server ready"));startButton = new QPushButton(tr("&Start")); quitButton = new QPushButton(tr("&Quit")); buttonBox = new QDialogButtonBox; buttonBox->addButton(startButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); connect(startButton, SIGNAL(clicked()), this, SLOT(start())); connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); connect(&tcpServer, SIGNAL(newConnection()), this, SLOT(acceptConnection())); connect(&tcpClient, SIGNAL(connected()), this, SLOT(startTransfer())); connect(&tcpClient, SIGNAL(bytesWritten(qint64)), this, SLOT(updateClientProgress(qint64))); connect(&tcpClient, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError))); QVBoxLayout *mainLayout = new QVBoxLayout; mainLayout->addWidget(clientProgressBar); mainLayout->addWidget(clientStatusLabel); mainLayout->addWidget(serverProgressBar); mainLayout->addWidget(serverStatusLabel); mainLayout->addStretch(1); mainLayout->addSpacing(10); mainLayout->addWidget(buttonBox); setLayout(mainLayout); setWindowTitle(tr("Loopback"));
}
void Dialog::start()
{
startButton->setEnabled(false);#ifndef QT_NO_CURSOR
QApplication::setOverrideCursor(Qt::WaitCursor);
#endifbytesWritten = 0; bytesReceived = 0; while (!tcpServer.isListening() && !tcpServer.listen()) { QMessageBox::StandardButton ret = QMessageBox::critical(this, tr("Loopback"), tr("Unable to start the test: %1.") .arg(tcpServer.errorString()), QMessageBox::Retry | QMessageBox::Cancel); if (ret == QMessageBox::Cancel) return; } serverStatusLabel->setText(tr("Listening")); clientStatusLabel->setText(tr("Connecting")); tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());
}
void Dialog::acceptConnection()
{
tcpServerConnection = tcpServer.nextPendingConnection();
connect(tcpServerConnection, SIGNAL(readyRead()),
this, SLOT(updateServerProgress()));
connect(tcpServerConnection, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(displayError(QAbstractSocket::SocketError)));serverStatusLabel->setText(tr("Accepted connection")); tcpServer.close();
}
void Dialog::startTransfer()
{
// called when the TCP client connected to the loopback server
bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, '@'));
clientStatusLabel->setText(tr("Connected"));
}void Dialog::updateServerProgress()
{
bytesReceived += (int)tcpServerConnection->bytesAvailable();
tcpServerConnection->readAll();serverProgressBar->setMaximum(TotalBytes); serverProgressBar->setValue(bytesReceived); serverStatusLabel->setText(tr("Received %1MB") .arg(bytesReceived / (1024 * 1024))); if (bytesReceived == TotalBytes) { tcpServerConnection->close(); startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}
}void Dialog::updateClientProgress(qint64 numBytes)
{
// callen when the TCP client has written some bytes
bytesWritten += (int)numBytes;// only write more if not finished and when the Qt write buffer is below a certain size. if (bytesToWrite > 0 && tcpClient.bytesToWrite() <= 4*PayloadSize) bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@')); clientProgressBar->setMaximum(TotalBytes); clientProgressBar->setValue(bytesWritten); clientStatusLabel->setText(tr("Sent %1MB") .arg(bytesWritten / (1024 * 1024)));
}
void Dialog::displayError(QAbstractSocket::SocketError socketError)
{
if (socketError == QTcpSocket::RemoteHostClosedError)
return;QMessageBox::information(this, tr("Network error"), tr("The following error occurred: %1.") .arg(tcpClient.errorString())); tcpClient.close(); tcpServer.close(); clientProgressBar->reset(); serverProgressBar->reset(); clientStatusLabel->setText(tr("Client ready")); serverStatusLabel->setText(tr("Server ready")); startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}My code is a little different from the example. My code listens on QHostAddress::Any, and a port number. The loopback example, use listern(), without any parameter. The default value of address is QHostAddress::Any, the default port is 0.
Tried the loopback example again. It failed also.
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Your firewall or Router is blocking your listen function. Nothing wrong with your code as it works on my machine windows 10 x64.
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@Sunfluxgames
No idea now. My Windows 10 firewall is turned off. Regarding Router, no idea about how to do that. -
@Global-Moderators @Sunfluxgames @Taz742 @VRonin
Finally I found the root cause! I set the global proxy settings in internet options. Go to IE, Tools->Internet options->Connections tab->Lan Settings->Check "use a proxy server for your LAN(These settings will not apply to dial up or VPN connections). And set the proxy server ip address/port for protocols, this settings has impact to the QT server listen functionality, causing the "network operation timed out" error. After I turned off the proxy settings in internet options. the QT server listen functionality worked properly.