Israel, Maybe the problem is that fact that you call worker initVLC(videoWin) from the main thread.
Maybe you could connect a signal to the thread started signal to call initVLC. Try to debug QThread::currentThread() when initVLC is called and when worker is created to see if what I say makes sense. Best, Nuno > On 19 Jul 2021, at 04:29, Israel Brewster <ijbrews...@alaska.edu> wrote: > > Yes, this is a FAQ, but I can’t seem to figure out what I am doing wrong. I > am using the worker pattern of QThread, (as opposed to subclassing), running > Qt 5.15.2. In my controller’s constructor, I have the following code to > initialize a worker: > > worker=new VLCWorker(); > worker->moveToThread(&vlcWorkerThread); > worker->initVLC(videoWin); > vlcWorkerThread.start(); > > The initVLC function, among other things, creates a timer and connects it to > a slot in the worker: > > rtspStartTimer=new QTimer; > rtspStartTimer->setSingleShot(true); > connect(rtspStartTimer, &QTimer::timeout, > this, &VLCWorker::rtspStarting); > > > Later, at some point during program execution, I try to start this timer from > a function in the worker (which itself was triggered by a signal from the > main thread): > > qDebug()<<"*****Trying to start timer which lives in > thread"<<(long)rtspStartTimer->thread()<<" from thread > "<<(long)this->thread(); > rtspStartTimer->start(250); > qDebug()<<"*****Timer attempt complete"; > > Unfortunately, this doesn’t work, giving me the following output: > > Debug: 2021-07-18T19:26:12.009 - *****Trying to start timer which lives in > thread 140235980165688 from thread 140235980165688 > (../DoorBellCamC/vlccontroller.cpp:121, void VLCWorker::rtspStarting()) > Warning: 2021-07-18T19:26:12.009 - QObject::startTimer: Timers cannot be > started from another thread (:0, ) > Debug: 2021-07-18T19:26:12.009 - *****Timer attempt complete > (../DoorBellCamC/vlccontroller.cpp:123, void VLCWorker::rtspStarting()) > > So even though the output of the debug confirms that the timer lives in the > same thread I am trying to call start from, I still get the error about > “timers cannot be started from another thread”. What am I doing wrong? > --- > Israel Brewster > Software Engineer > Alaska Volcano Observatory > Geophysical Institute - UAF > 2156 Koyukuk Drive > Fairbanks AK 99775-7320 > Work: 907-474-5172 > cell: 907-328-9145 > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest
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