├── README.md
└── main.py


/README.md:
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 1 | # PyQT5 Threading The Right Way
 2 | 
 3 | ### History
 4 | After researching PyQT5 threading while updating a simple app with [cleary](https://github.com/cleary), we found that most of the documentation regarding this topic is incorrect, including official documentation.
 5 | 
 6 | We eventually stumbled across a few articles (listed below) that had correct methods and documentation as to how this works.
 7 | 
 8 | **Reference:** 
 9 |  * https://www.learnpyqt.com/courses/concurrent-execution/multithreading-pyqt-applications-qthreadpool/  
10 |  * https://stackoverflow.com/questions/11426335/qthread-execution-freezes-my-gui
11 |  * https://blog.qt.io/blog/2010/06/17/youre-doing-it-wrong/ ...which dead links to where they promise the real information is. [Here is the referenced blog post on archive.org](https://web.archive.org/web/20200128030120/https://www.qt.io/blog/2006/12/04/threading-without-the-headache)
12 | 
13 | ### Example Code:
14 | 
15 | Functional threading example: [main.py](https://github.com/Givo29/pyqt5-threading/blob/master/main.py)
16 | 


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/main.py:
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 1 | import sys
 2 | import time
 3 | from PyQt5.QtWidgets import QApplication, QWidget, QCheckBox
 4 | from PyQt5.QtGui import QIcon
 5 | from PyQt5.QtCore import QThread, pyqtSignal, QThreadPool, pyqtSlot, QRunnable, QObject
 6 | 
 7 | 
 8 | class Signals(QObject):
 9 |     return_signal = pyqtSignal(str)
10 | 
11 | 
12 | class Thread(QRunnable):
13 |     signal = pyqtSignal(str)
14 | 
15 |     def __init__(self):
16 |         super(Thread, self).__init__()     
17 |         self.signal = Signals()    
18 | 
19 |     @pyqtSlot()
20 |     def run(self):
21 |         time.sleep(5)
22 |         result = "Some String"
23 |         self.signal.return_signal.emit(result)
24 | 
25 | 
26 | class App(QWidget):
27 |     def __init__(self):
28 |             super().__init__()
29 |             self.title='Hello, world!'
30 |             self.left=2100
31 |             self.top=500
32 |             self.width=640
33 |             self.height=480
34 |             self.threadpool = QThreadPool()
35 |             self.initUI()
36 | 
37 |     def initUI(self):
38 |             self.setWindowTitle(self.title)
39 |             self.setGeometry(self.left,self.top,self.width,self.height)
40 |             checkbox = QCheckBox('Check Box', self)
41 |             checkbox.stateChanged.connect(self.clickCheckbox)
42 |             self.show()
43 | 
44 |     def clickCheckbox(self):
45 |         thread = Thread()
46 |         thread.signal.return_signal.connect(self.function_thread)
47 |         self.threadpool.start(thread)
48 | 
49 |     def function_thread(self, signal):
50 |         print(signal)
51 | 
52 | 
53 | if __name__=='__main__':
54 |         app=QApplication(sys.argv)
55 |         ex=App()
56 |         sys.exit(app.exec_())


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