[Qt-interest] can't send signal in multithread

[Mihail Naydenov]

You'd better search the archives, this has been discussed thousand times...

At a first glance it seams wrong you are waiting for the thread before app exec.
a.exec will never be reached and the signal to jm cannot be delivered.
I might be wrong, my thread skills are rusty at the moment, 
but as I said, search the list, you will find the answer for sure!

MihailNaydenov  


>
>From: beka nosky <bekanosky at gmail.com>
>To: Qt-interest at trolltech.com
>Sent: Thu, April 15, 2010 11:08:38 AM
>Subject: [Qt-interest] can't send signal in multithread
>
>>Hi All, 
>I make some simple code to send signal in multithread environment. But it failed.
>The code was successfull in non-threading environment.
>
>This is my code. Where is my fault ?
>
>/*------------------------------------------------------------*/
>>main.cpp 
>/*------------------------------------------------------------*/
>#include <QtCore/QCoreApplication>
>#include "JobMgr.h"
>
>int main(int argc, char *argv[])
>{
>    QCoreApplication a(argc, argv);
>
>    JobMgr jm;
>
>    jm.start();
>    jm.wait();
>
>    return a.exec();
>}
>
>/*------------------------------------------------------------*/
>>JobMgr.h
>>/*------------------------------------------------------------*/
>
>#ifndef JOBMGR_H
>#define JOBMGR_H
>
>#include <QThread>
>#include <QFileSystemWatcher>
>
>class JobMgr : public QThread
>{
>Q_OBJECT
>public:
>    explicit JobMgr(QObject *parent = 0);
>>    void run();
>
>private:
>    QFileSystemWatcher fsw;
>signals:
>
>public slots:
>    void dirChangedHandler(QString dir_path);
>};
>
>#endif // JOBMGR_H
>
>
>
>>/*------------------------------------------------------------*/
>>
>JobMgr.cpp
>>
>/*------------------------------------------------------------*/
>
>#include "JobMgr.h"
>#include <stdio.h>
>
>JobMgr::JobMgr(QObject *parent) :
>    QThread(parent)
>{
>}
>
>void JobMgr::run()
>{
>    fsw.addPath("/tmp/job/");
>
>    if( connect(&fsw,SIGNAL(directoryChanged(QString)),SLOT(dirChangedHandler(QString))) == false) {
>>        fprintf(stderr,"%s connect error\n",__func__);
>    }
>    else
>        fprintf(stderr,"%s connect succeed\n",__func__);
>
>    fflush(stderr);
>
>    exec();
>}
>
>void JobMgr::dirChangedHandler(QString dirPath)
>>{
>    fprintf(stderr,"%s() ada perubahan di dir :%s\n",__func__,  dirPath.toStdString().c_str());
>    fflush(stderr);
>}
>
>