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Qt's meta-object system provides a mechanism to automatically connect signals and slots between QObject subclasses and their children. As long as objects are defined with suitable object names, and slots follow a simple naming convention, this connection can be performed at run-time by the QMetaObject::connectSlotsByName function. Home; Signals and Slots. Contact; Signals and Slots. Signals and slots are used to connect between an event from gui and a function. In other words, you can manage situations what happens after an situations. For example: on this. Signals and slots must have same parameters. It works: QObject::connect(ui.comboBox, SIGNAL. Nov 02, 2009 Exceptionally, if a signal has more parameters than the slot it is connected to, the additional parameters are simply ignored: If the parameter types are incompatible, or if the signal or the slot doesn't exist, Qt will issue a warning at run-time if the application is built in debug mode.
![Qt disconnect signal slot Qt disconnect signal slot](/uploads/1/2/5/1/125190236/258947541.png)
Qt Disconnect Signal Slot
Hello,
I'm making a Sudoku (solving/generating) program in Qt. Now, I'm just a beginner as a programmer, and I have no experience with Qt. I'm stuck in a strange situation. I want to connect a signal and slot with different parameters.
My grid is made up of an array of QLineEdits, and here's how I'm making the connections:
The 3 parameters of checkInput() are the minigrid, row and column numbers of the respective box in the grid. Qt doesn't accept Signals and Slots with different parameters, so how do I go about doing this?
Do I:
1) Overload returnPressed() of QLineEdit ? Is this even possible?
2) Create my own Signal in the Grid class? If so, how do I connect this signal to returnPressed() ? (if I do, then both will need to have void parameters. What how do I get the values of minigrid, row and column then?)
3) Change the structure of my grid? Use 81 connect statements ?
4) Can I subclass QLineEdit, and make my own signal in it?
Any help with this will be greatly appreciated..
Qt Connect Signal Slot With Parameters
Hello,
I'm making a Sudoku (solving/generating) program in Qt. Now, I'm just a beginner as a programmer, and I have no experience with Qt. I'm stuck in a strange situation. I want to connect a signal and slot with different parameters.
My grid is made up of an array of QLineEdits, and here's how I'm making the connections:
The 3 parameters of checkInput() are the minigrid, row and column numbers of the respective box in the grid. Qt doesn't accept Signals and Slots with different parameters, so how do I go about doing this?
Do I:
1) Overload returnPressed() of QLineEdit ? Is this even possible?
2) Create my own Signal in the Grid class? If so, how do I connect this signal to returnPressed() ? (if I do, then both will need to have void parameters. What how do I get the values of minigrid, row and column then?)
3) Change the structure of my grid? Use 81 connect statements ?
4) Can I subclass QLineEdit, and make my own signal in it?
Any help with this will be greatly appreciated..