[Interest] Problems with QWebSocketServer

Wed Jun 22 17:28:12 CEST 2016

Oh,

wow what a stupid mistake. Thanks for the hint, it seems i need more 
sleep :)

Adrian

Am 22.06.2016 um 16:42 schrieb André Hartmann:
> Hi,
>
> > void MainWindow::buttonClicked()
> > {
> > // uncomment this for not working websocketserver in mainwindow
> > //  QWebSocketServer server(QStringLiteral("QWebSocketServer"),
> > QWebSocketServer::NonSecureMode);
> > //  if (!server.listen(QHostAddress::LocalHost, 12345)) {
> > //    qFatal("Failed to open web socket server.");
> > //  }
> > }
>
>
> Your'e creating the server in the stackframe of 
> MainWindow::buttonClicked(). As soon as the function is leaved, the 
> stackframe is cleared and the destructor of QWebSocketServer is called.
>
> Solution: add a member variable QWebSocketServer *m_server and 
> allocate memory for it in the buttonClicked():
>
> m_server = new QWebSocketServer(QStringLiteral("QWebSocketServer"),
> > QWebSocketServer::NonSecureMode);
>
> Best regards,
> André
>
> PS: I know this problem because I had it same way with QTcpServer :)
>
> Am 22.06.2016 um 16:28 schrieb Adrian Jäkel:
>> Hi,
>>
>> i'm having problems starting a QWebSocketServer from within a
>> QMainWindow. Perhaps i'm missing something obvious?
>>
>> When starting it from the main.cpp it works correctly and i can connect
>> to it from my sample html page. But inside a QMainWindow e.g. after
>> clicking a button my html page refuses to connect with "Error in
>> connection establishment: net::ERR_CONNECTION_REFUSED"
>>
>> Below is a small sample app. Just un/comment accordingly when testing
>> both cases.
>>
>> Regards,
>> A. Jäkel
>>
>> main.cpp
>>
>> #include <QApplication>
>> #include <QMainWindow>
>> #include <QWebSocketServer>
>>
>> #include "mainwindow.h"
>>
>> int main(int argc, char** argv)
>> {
>>      QApplication app(argc, argv);
>>
>>      // comment the following lines when trying websocketserver from
>> mainwindow
>>      QWebSocketServer server(QStringLiteral("QWebSocketServer"),
>> QWebSocketServer::NonSecureMode);
>>      if (!server.listen(QHostAddress::LocalHost, 12345)) {
>>          qFatal("Failed to open web socket server.");
>>      }
>>
>>      MainWindow w;
>>      w.show();
>>
>>      return app.exec();
>> }
>>
>> mainwindow.cpp
>>
>> #include "mainwindow.h"
>>
>> #include <QWebSocketServer>
>> #include <QPushButton>
>>
>> MainWindow::MainWindow(QWidget *parent) :
>>    QMainWindow(parent)
>> {
>> // uncomment this for not working websocketserver in mainwindow
>> //  QPushButton *button = new QPushButton("start server");
>> //  setCentralWidget(button);
>> //  connect(button, &QPushButton::clicked, this,
>> &MainWindow::buttonClicked);
>> }
>>
>> void MainWindow::buttonClicked()
>> {
>> // uncomment this for not working websocketserver in mainwindow
>> //  QWebSocketServer server(QStringLiteral("QWebSocketServer"),
>> QWebSocketServer::NonSecureMode);
>> //  if (!server.listen(QHostAddress::LocalHost, 12345)) {
>> //    qFatal("Failed to open web socket server.");
>> //  }
>> }
>>
>> mainwindow.h
>>
>> #ifndef MAINWINDOW_H
>> #define MAINWINDOW_H
>>
>> #include <QMainWindow>
>>
>> class MainWindow : public QMainWindow
>> {
>>    Q_OBJECT
>>
>> public:
>>    explicit MainWindow(QWidget *parent = 0);
>>    ~MainWindow() {}
>>
>>    void buttonClicked();
>> };
>>
>> #endif // MAINWINDOW_H
>>
>>
>> index.html
>>
>> <html>
>>      <head>
>>          <script type="text/javascript">
>>              window.onload = function() {
>>                  var baseUrl = "ws://localhost:12345";
>>
>>                  console.info("Connecting to WebSocket server at " +
>> baseUrl + ".");
>>                  var socket = new WebSocket(baseUrl);
>>
>>                  socket.onclose = function()
>>                  {
>>                      console.error("web channel closed");
>>                  };
>>                  socket.onerror = function(error)
>>                  {
>>                      console.error("web channel error: " + error);
>>                  };
>>                  socket.onmessage = function(e)
>>                  {
>>                      console.info("message: " + e.data);
>>                  };
>>                  socket.onopen = function()
>>                  {
>>                      console.warn("WebSocket connected.");
>>                  }
>>              }
>>          </script>
>>      </head>
>>      <body>
>>      </body>
>> </html>
>>
>> .pro file
>> QT += gui widgets websockets
>>
>> SOURCES += \
>>      main.cpp \
>>      mainwindow.cpp
>>
>> HEADERS += \
>>      mainwindow.h
>>
>> DISTFILES += \
>>      index.html
>>
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