Qt signal slot different arguments

Multithreading with Qt | Packt Hub

[solved] Qt Signal/Slots in one class but emitted from ... So the GUI class defines slots and signals, the signals are emitted in the implemented interface functions. The signals and slots are connected using: @"connect(this, SIGNAL(xyz), this SLOT(xyz));"@ I think the problem is that the intface functions that emit the signals are running in thread a but the GUI runs in thread b. Lambda that uses signal argument to connect to a slot | Qt ... @ofmrew said in Lambda that uses signal argument to connect to a slot: @sierdzio What if the someInt in your response is created on the fly and only exists as an argument in the signal. I has no name; that is why in my example code I had to declare a variable in which to store a value and be able to address it by name. signal/slot arguments | Qt Forum Hi It depends how you have connected the mySignal. If within same thread, the emit should be like a function call and it should not crash. However, if between threads ( Qt::QueuedConnection ) and and Qt saves the pointer and deliver the signal via event loop, it would not be good.

Multithreading - Qt send signal to different thread

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. SOLVED Qt: qt slots with parameters Signal and slot different

Passing extra arguments to Qt slots - Eli Bendersky's website

Signals and slots can take any number of arguments of any type. ... The situation is slightly different when using queued connections; in such a case, the code ... New Signal Slot Syntax - Qt Wiki

Connecting signals to slots with less params allowed in Qt?

Qt Signals And Slots - Programming Examples Connecting Signals and Slots. Features. Examples. Objectives. Learn the advantages of signals/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 features. Multithreading - Qt send signal to different thread Tag: multithreading,qt,signals,slot. I have searched SO for this question, but they were a bit different than mine. My problem is that I dont want to receive a signal from another thread, but I want to send one. Receiving works in my app, but when trying to send, I am getting error that I am trying to send to...

Disclaimer: My qt is rather rusty, but the signal/slot mechanism is still just C++ function calls. If the signal/slot mechanism actually copies objects into internal storage, my apologies (you'll need to check the Qt pages, there's a big one on signals/slots afaik) - as the bits below will only be relevant in a C++ context, not in a C++ + Qt context.

Connecting signals and slots with different parameters: Is ... HI, I wish to make a connection, and I'm aware that they both must have the same type of parameter in order to work. My question is: Is there a way, or workaround, to this issue? In my project, I want to connect a simple valuechanged signal to a a slot th... How to pass parameters to a SLOT function? | Qt Forum connect(buttonOne, SIGNAL(clicked()), this, SLOT(doSomething(double *))); @ This should work. But clicked() will not pass any data to your slot, so the pointer will be dangling. Plus you probably put the connect statement in a wrong place: it should be shown earlier, not on button click (but that depends on your design. Signals and Slots - Qt Documentation 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.