Support for Signals and Slots¶ One of the key features of Qt is its use of signals and slots to communicate between objects. Their use encourages the development of reusable components. Tower of trial endless frontier. A signal is emitted when something of potential interest happens. A slot is a Python callable.
I am trying to write a plugin for Wireshark, a Qt GUI application. Wireshark is mostly written in C with C++ and Qt used to handle the user interface. The plugin framework comprises mainly a set of three or four C callback functions. I'm writing the plugin in C++, exposing the callbacks using extern 'C' declarations. The callbacks are being called correctly and that all looks fine.
Boost Signals And Slots
The plugin needs to provide a TCP server. I've cribbed various servers from examples on the web, and they work except for in one respect; the slots in my plugin classes never get called.
- However, the biggest reason I love Qt so much is the Signals and Slots model it uses. All of the programming languages and frameworks based on those programming languages have some method of communicating between different objects or functions.
- Signals and Slots vs Callbacks A callback is a pointer to a function that is called when an event occurs, any function can be assigned to a callback No type-safety Always works as a direct call Signals and Slots are more dynamic A more generic mechanism Easier to interconnect two existing classes Less knowledge shared between involved classes.
The code looks like this:
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mytcpserver.h
mytcpserver.cpp
Pyside2 Signal Slot
packet-syncro.cpp These are excerpts from the file with the callbacks
proto_register_syncro is one of the callback functions that get called two or three times during Wireshark startup.
Qt Signals And Slots Vs Callback
This all creates a DLL called syncro.dll, which builds, loads and runs without problem. I then start Wireshark and use Putty to connect to the TCP server. It connects OK but I don't get the 'Hello client' message. I also find that the newConnection slot is not called.
All of the above code runs on the main application thread which is own the QMainWindow object.
C++ Signal Slot
How does my newConnection slot get added to the Event Loop? What have I done wrong here?
Thanks and regards..Paul
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