Qt connect signal slot another class
Jan 14, · connect(WOWMONEY.EU_btn, SIGNAL(clicked()), SLOT(main_win_test_function())); I cant call the test function from the other class unless I call it from the main_win_test_function() I know I'm missing the 'receiver widget' from the connect statement, although it does work without it in the main window class and I don't get any errors when compiling. Old syntax Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) connect(sender, SIGNAL(valueChanged(QString, QString)), receiver, SLOT(updateValue(QString))); New: connecting to QObject member. 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.
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Wieland If I do it in main. Now you understand why posting code is very important. In GUI programming we often want a change in one widget to be notified to another widget. Re-run quake, rebuild, and post here once you've verified that it works and demonstrates the problem. Signals and slots are loosely coupled: a class which emits a signal neither knows nor cares which slots receive the signal.
Signals and Slots
Thank You. Without full code, it's quite difficult to identify the exact issue of the problem, so I'll outline a few important points to check. Once a signal is declared in a class, a slot to receive the signal should match the arguments passed in and when you connect a signal to a slot, you must not add the function argument names. Finally, if you're using Qt 5, you can use the new connection call, which doesn't require you to specify any argument, but instead takes the addresses of slot and signal functions.
Since it references the address of a function, in actuality, the functions don't need to be classed as a slot and will still be called. One more thing, you didn't show enough code but I suspecting that you program leaves scope of objectA variable and your emitting object is just destroyed before it can emit any signal objectA is local variable created on stack not on heap.
You should new your object to get it allocated in heap. Meet The Overflow, a newsletter by developers, for developers. Fascinating questions, illuminating answers, and entertaining links from around the web.
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The Issue: Connecting a signal from client. Your MainWindow lives on the stack. I think by the time your doSomething slot is triggered, the MainWindow object is already long gone. Try creating your MainWindow on the heap instead. You have created an instance of MainWindow in the file main.
But in your client. You are not seeing two main windows because you do not run the exec or show methods of this second instance. Now coming to the solution, you will have to connect the signal from client to the proper MainWindow instance. I will suggest two methods below. I believe you create an instance of client in one of the member functions of the class MainWindow. If so then shift the connect method to the file mainwindow.
If you cannot do what is explained above, then you can use a combination of a static pointer and a static function to get the instance of MainWindow. Note that this method can also be used to ensure that there is only one instance of MainWindow at any given time. Now in whatever class you need to get the instance of MainWindow in use, simply use the static function MainWindow::GetInstance to get the pointer to the MainWindow instance and use that as the parameter for connect.
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Many readers have read my Appendix 3A and asked about higher coinages. Until May I have resisted publishing my results because of an insufficient sample size.
However I have been asked so many times that I'll give you what I've got. First let me say that my emphasis is still nickel slots.
The vast majority of video display slots that I test are nickel games. So there isn't much need to bet more than that unless the player has a very large bankroll.
As of this writing I have only seen quarter video display slots in 16 Las Vegas casinos and dollar slots in 8. Even those that had them did not have a large selection. The following table lists all casinos in which I found at least one quarter or dollar video display slot machine. The table shows the nickel, quarter, and dollar returns, sorted by nickel return.
You will notice some casinos actually go down slightly from nickels to quarters. This is due to sampling variation.