20201025 visual studio2019 qt5.14 use of signal and slot functions

QT5.14 Use of signals and slots

1. Explanation of signal and slot principle

1.1 General signal and slot use connect function ,connect The function is QT Special signals and slot functions . Generally speaking , Only inherited objcet Class has the function of signal and slot , Because this is QT Library function comes with . Otherwise , You need to write a connect The function of .

1.2 But this is not very serious , Because you only need to inherit object That's all right. , You can inherit by yourself object Add the functions you need . As shown in the figure

 

2. Add macro definitions of signals and slots

 

3. Add signal

4. Sending signal

5. Received signal

6. Processing signals