Qt Signal Slot Priority
Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. The minimal example requires a class with one signal, one slot and one connection: counter.h. Signals and slots were one of the distinguishing features that made Qt an exciting and innovative tool back in time. But sometimes you can teach new tricks to an old dog, and QObjects gained a new way to connect between signals and slots in Qt5, plus some extra features to connect to other functions which are not slots.
Code for this videothis video we will learn How Qt Signals and Slots Wor. Qt will indeed call directly the function pointer of the slot, and will not need moc introspection anymore. (It still needs it for the signal) (It still needs it for the signal) But what we can also do is connecting to any function or functor. Disconnect follows the same syntax as connect so 'disconnect(A,signal,B,slot)' could be read as: A no longer signals B in the slot. B can stop suffering now. Emitting the signal: A emits the signal by calling emit, all objects whose slots have been connected to that type of signal will be, emmm signaled then: void ObjectADialog:: onpushButton.
Hi all!
Small fragment of the project:
mainwindow.cpp
protocol.cpp
If I do not put valve and pressureSensors in a separate thread, then everything works more or less normally.
But if I put them in a separate thread, the valve opening slot works very late (~ 10-20 seconds, as lucky). As I understand it, this is because the signal is emitted from the main thread, and the slot is in the other thread. Is it possible to build a queue?
Qt Signal Slot Priority Box
Slot open from Valve class must have the highest priority
Qt Signal Slot Priority Track
Thankful in advance for the help!