[Moved] qt creator build a dll

wtrich

Inside the network connections of Qt and thread made of a DLL library, use the code to use the Qt library can listen to the connection and send data, but on the inside C # to call to die, do not know why? Which can help me? Thank you!

lgeyer

Please rephrase and elaborate your question.

tobias.hunger

How does the question involve Qt Creator?

wtrich

@

//qtcpdll.pro
QT += network core

QT -= gui

TARGET = qtcpdll
TEMPLATE = lib

DEFINES += QTCPDLL_LIBRARY

SOURCES += qtcpdll.cpp
thread.cpp

HEADERS += qtcpdll.h
thread.h

///////////////////////////////////////////////////////////////
//qtcpdll.h
#ifndef QTCPDLL_H
#define QTCPDLL_H

#define MYDLLEXPORT extern "C" __declspec(dllexport)

MYDLLEXPORT int start();

#endif // QTCPDLL_H

/////////////////////////////////////////////////////////////
//thread.h
#ifndef THREAD_H
#define THREAD_H

#include <QThread>

class thread : public QThread
{
Q_OBJECT
public:
explicit thread(QObject *parent = 0);

void run();

};

#endif // THREAD_H

/////////////////////////////////////////////////////////////
//qtcpdll.cpp
#include "qtcpdll.h"

#include "thread.h"

#include <QtCore/QCoreApplication>

thread *t;

MYDLLEXPORT int start()
{
// int r = 1;
// QCoreApplication a(r, 0);
t = new thread;

t->start();

return 9999999;

// return a.exec();
}

////////////////////////////////////////////////////////////////
//thread.cpp

#include "thread.h"

thread::thread(QObject *parent) :
QThread(parent)
{
qWarning("thread is constructed!");
}

void thread::run()
{
for(int i = 0; i < 1000; i++)
{
qWarning("%d", i);
//sleep(1000);
}
}
@

This is an example I wrote, ready to call in C # inside.
I call that in C # which exported functions, the thread can not function properly.
thanks!

lgeyer

As said, please elaborate your question. Are there any error messages or debug messages? Does the application crash? Does your thread even start? How does your C# application look like? Does your code work when called from C++, not C#?

"thread can not function properly" is no useful piece of information.

wtrich

@
C# code
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
public static class Test
{
[DllImport("qtcpdll.dll", EntryPoint="start", CallingConvention=CallingConvention.Cdecl)]
public extern static int start();
}
}

///////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
class Program
{

    static void Main(string[] args)
    {
        int res = Test.start();

        Console.WriteLine(res);

        Console.Read();
     }
 }

}

///////////////////////////////////////////
QT CODE
tcpserver

#ifndef SERVER_H
#define SERVER_H

#include <QObject>
#include <QTcpServer>
#include <QTcpSocket>

class server : public QObject
{
Q_OBJECT
public:
explicit server(QObject *parent = 0);

QTcpServer *tserver;
QTcpSocket *socket;

public slots:
void newConnect();
void receiveMSG();

};

#endif // SERVER_H

//server.cpp
#include "server.h"

server::server(QObject *parent) :
QObject(parent)
{
tserver = new QTcpServer;
if(tserver->listen(QHostAddress::Any, 9999))
qWarning("listing on 9999");

connect(tserver, SIGNAL(newConnection()), this, SLOT(newConnect()));

}

void server::newConnect()
{
socket = tserver->nextPendingConnection();
connect(socket, SIGNAL(readyRead()), this, SLOT(receiveMSG()));
}

void server::receiveMSG()
{
QByteArray data;
data.resize(socket->bytesAvailable());
socket->read(data.data(), data.size());
qWarning("receive# %s", data.data());
}

@
Thread running normally now. I was in the project which added a "tcpserver", used to monitor the connection and receive messages. In C # to call when the client "socket" shows the state is "already connected", but in C # where not receive data, "incomingConnection" function has not been called. If I use QT to use the DLL functions can be done, then, C # in the die. Is no event loop ah?