1/23/2020 Qt Signal Slot Thread Performance
I am new to Qt and am writing a program on Windows, using Visual Studio Community 2015 and the Qt Designer plugin.
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One of the things this program does is create a background thread to monitor some external hardware. I used the WINAPI CreateThread for this, not a Qthread, because a prior version of the program was not GUI based, and I'd rather avoid rewriting anything I don't have to.
I want the main GUI window to update when the external hardware state changes, which may be rarely, or several times per second.
The Threading Classes Thread Support in Qt Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Signal Slot Qt Thread Free Signal Slot Qt Thread Spins: Available after deposit bonus is redeemed/lost, credited as £2 bonus. MONOPOLY Live only. 1x wagering and Max bonus bet of £5 applies to winnings, 7 days Signal Slot Qt Thread to accept & 7 days Signal Slot Qt Thread to Signal Slot Qt Thread complete wagering, maximum withdrawal from. Is this an acceptable/safe way to update GUI from another thread? 98% of my Qt code was generated by the Qt Designer plugin. It has a signal/slot editor but it appears to only have the capability of selecting a GUI feature as a 'sender'. And my worker thread needs to be able to send it. @168gr said in Is this an acceptable/safe way.
I understand that it is unsafe to update the Qt GUI from worker threads, and that the main GUI thread should be signaled to do this work itself. This is the method that I am using. It works, but I want to
Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type. Qt Signals And Slots Fold Unfold. Table of Contents. Meta-Object System. Signals and Slots. Connecting Signals and Slots. Learn the advantages of signals/slots; Understand the concept of signal/slots; Learn how to connect signals to slots; Be able to use and define your own signals/slots; Meta-Object System. Extends C with dynamic.
Stripped down to its bones, this is my method:
In my main QMainWindow class, I've added a function to do the actual GUI update
my_prog_pointer is ultimately passed as a parameter to the worker thread, so that thread will know who to notify when GUI work has to be done.
The GUI update function is something like:
And from the other thread, when I want to update the GUI, I call
And it works.
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Qt Signal Slot Connect
Is this method safe? If so, is there a reason (performance, style, whatever) to do it differently?
Qt Signal Slots
Thank you.
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