Slot Connection

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Slot Connection

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Slot Connection - Slotconnection Wendelstein

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How do I make Patients classes know about global api instance? Some qDebug s around connection, in the very first line of Patients::eventHandlerTwo and in the deconstructor of Patients should help to prove that.

I actually did not do anything other that making apiinstance as global in main. I truly, truly do not understand. So I will leave others to help, who obviously understand your source code better than I.

JonB Yes, that's interesting. You can't include main. So main. You really should not do it like this.

Pass pointer to the constructors of the classes which need it. No, but you might be including main. No need to define it outside as main lives as long as the application is running.

Could you give me an example to show how do I pass a pointer to the constructor of the classes? That's why I made it global, but now I realize it's not a good way of programming!

You may not need to pass it around that way. What happens? If there is an error, unfortunately it's time we saw all your relevant code which should work but does not, because there is way too much incomplete information in what you have posted.

I hesitate to say this, because I have a bad feeling that's going to be at least 3. Which is an awful lot for to paste and for us to look through : If you could cut it down to a relevant, minimal subset which reproduces the bad behaviour you say you see, that would be really good JonB Thanks a lot for your feedback.

From the suggestions from you guys, I feel like there is something wrong in making use of global variables. I should try also the other way of passing pointer to the class.

But instead If I call both Patieints and Settings in the main as shown below , both behave as expected. Do you immedatly think of any reason for this!?

We need to see exactly how Settings calls Patients , plus the signal connections, with whatever is relevant to that case, to judge where the problem is.

Qt Forum. Only users with topic management privileges can see it. Reply Quote 0 2 Replies Last reply. Reply Quote 3 1 Reply Last reply.

Reply Quote 4 1 Reply Last reply. Reply Quote 0 1 Reply Last reply. If this is of your class Settings the following should work.

Reply Quote 1 1 Reply Last reply. So where do you call your connect statement? JonB I'm connecting with the same signal in the previous window , so do I need to disconnect that and connection to use the same signal in with a new slot?

What is the reason for this? Reply Quote 2 1 Reply Last reply. Hi, russjohn said in same signal-slot connection in two windows : QObject::connect api.

JonB This is how I make the connection in Settings. JonB I thought api should be known and accessible to all classes if intialized as global in the main.

JonB it did not mention anything like that. For now, humour me: Go into your main. If there is no error, see whether your program behaves correctly now.

But I was trying to understand a reason program behaves this way. JonB Can't see any change. Loading More Posts 60 Posts.

It's only work is to call SomeUtil 's slot forward the signal. You can connect the signal to both slots and they will both be called, in the order you connect them.

As suggested by ctinka, defining SomeController::processText as a signal is the right solution. It is even possible to connect a signal directly to another signal.

This will emit the second signal immediately whenever the first is emitted. On the other hand, signals are generated by Qt moc and therefore are able to call connected slots:.

Learn more. Ask Question. Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed 4k times.

Signals are considered to be function which "speaks", not "listens". Active Oldest Votes. Jesper Juhl Jesper Juhl On the other hand, signals are generated by Qt moc and therefore are able to call connected slots: Signals are automatically generated by the moc and must not be implemented in the.

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I mean, are they created in some "higher level" container object? I'm thinking what will happen if you need to add 2 more windows, are you going to connect the api and LED handling in those new windows as well?

Note: this is just a test example. Where the Test is your current class and it emitting a signal and receiving it. Also, you can do it using lambda.

You need to provide more info about the api global variable, where and how you have initialized it? Cobra Thank you. The new connect syntax seems ok.

It did not complain about anything. But I'm not getting the expected output. Just to summarize. In the Patients constructor, I did connect as follows:.

When I put a breakpoint in the connect statement, it did not went into the eventHandlerTwo slot. What do you mean? When the connect statement is executed it will not cause any entry into Patients::eventHandlerTwo , that only comes when the signal is later emit ted.

I'm connecting with the same signal in the previous window , so do I need to disconnect that and connection to use the same signal in with a new slot?

No, you do not have to disconnect, a signal may have any number of slots attached. Though if a previously-attached slot does not return, or misbehaves like if the slot instance is no longer around, it is possible the second slot might not get called.

So if debugging what is going you might be advised to temporarily not connect the Settings slot, just the Patients slot and concentrate on sorting that out.

It is not possible to say from what you have posted why one slot works and the other does not. JonB Thank you. I tried to connect only the Patients slot but cant see where I'm wrong..

I just noticed this thing if I call both my Settings and Patients from my main the connection is successful see below. My signal source api is a global variable which is initialized in the main as shown above.

So constructing both classes in the main makes connection ok and I'm gettting expected output. But if I call one window from other makes connection true but my slot is not being called at all.

In these cases where do you do the connect s from? And, how do you know your connect s are successful? QObject::connect api. And I see nothing in code about any QLabel in either case, not mentioned by you before Use a debugger to make sure whether slots are being hit.

You can connect the signal to both slots and they will both be called, in the order you connect them. As suggested by ctinka, defining SomeController::processText as a signal is the right solution.

It is even possible to connect a signal directly to another signal. This will emit the second signal immediately whenever the first is emitted.

On the other hand, signals are generated by Qt moc and therefore are able to call connected slots:.

Learn more. Ask Question. Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed 4k times. Signals are considered to be function which "speaks", not "listens".

Active Oldest Votes. Jesper Juhl Jesper Juhl From the other answers in this thread, I would conclude that I can safely replace the emit of fooSignal by a call to fooSlot thereby improving the readability of our code.

I had made the change, but our unit tests started failing because of this change and the conclusion was that I overlooked something. Had the legacy code writer done that as well, you would have never thought about replacing that connect with a direct function call.

PS: you can also use QMetaObject::invokeMethod instead of signal slot and connect, it excepts a connectiontype as argument and its shorter if you call the method only once.

That is actually the reason, why I always pass the 5th parameter - Qt::QueuedConnection - to QObject::connect, when I know, that the connection crosses threads.

That assumes you know the call will be across threads. One of the reasons to have AutoConnection is to have the behaviour independent of the receiver's thread.

Also by passing Qt::QueuedConnection, you enforce the event to go through the event loop, which isn't necessary in most cases think also copying of the slot's arguments , and furthermore it may cause out of order execution in your emitting object in some rare cases i.

I actually use this quite a bit to connect a slot of a derived class to a signal of the base class. Yes, I realize I'm connecting a signal to another signal, instead of a slot, but the exact same thing applies.

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