[python] 初识 PyQt5

昨天想着用 Python 写个展示的 demo，之前打算熟悉一下 PyQt ，正好边学边做，学以致用。

主要的流程是在 cmd 下运行 .exe 并读取输出结果，运到的困难是如何实时回传数据以及修改图片大小并显示（缩放到固定大小）。

以下是代码，只展示框架，部分参数未设置。基于 Python3 + PyQt5

import os
import time
import sys

import subprocess
from configparser import ConfigParser
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
 
 
class Example(QMainWindow):    
    def __init__(self):
        super().__init__()        
        self.initUI()
                
    def initUI(self):     
        self.command = ""
        self.inipath = r""
        self.cf = ConfigParser()
        self.cf.read(self.inipath)

        main_ground = QWidget()
        self.setCentralWidget(main_ground)

        grid = QGridLayout()
        grid.setSpacing(10)
        
        self.title = QLabel('Result',self)
        self.titleEdit = QLineEdit(self)
        self.label = QLabel("photo",self)
        
        self.title.setGeometry(30,30,50,25)
        self.title.setFont(QFont('SansSerif', 12))
        
        """
        grid.addWidget(self.title,1,0)
        grid.addWidget(self.titleEdit,1,1)
        grid.addWidget(self.label,2,0,5,5)
        main_ground.setLayout(grid)
        """
             
        self.statusBar()
        QAction()
        QAction.triggered.connect() 
        
        menubar = self.menuBar()
        RunMenu = menubar.addMenu('&Run')
        RunMenu.addAction()     
        EditMenu = menubar.addMenu('&Edit')
        EditMenu.addAction()
        
        self.setGeometry(300, 300, 740, 480)
        self.setWindowTitle('VehicleDetect')
        #self.setWindowFlags(Qt.WindowMinimizeButtonHint) #禁止调整窗口大小
        self.setFixedSize(self.width(), self.height())
        self.show()
         
    def Action(self):
        self.cf.set()
        self.cf.write(open(self.inipath,'w'))
        self.showDialog()
        if self.fname[0]:
            self.command = ''
            subprocess.call(self.command)
            print("\n",end = "")
            return           
    
    def showDialog(self):
        self.fname = QFileDialog.getOpenFileName(self, 'Open file', r'D:\')  
        return
    
    def update_item_data(self,data):
        self.titleEdit.setText(data)
        ResultPath = r''
        imglist = os.listdir(ResultPath)
        if int(data):
            imgshow = os.path.join(ResultPath,imglist[-1])
            image = QImage()            
            image.load(imgshow)
            #self.label.setPixmap(QPixmap(imgshow))
            self.label.setPixmap(QPixmap.fromImage(image).scaled(self.label.size(), Qt.KeepAspectRatio, Qt.SmoothTransformation));

class UpdateData(QThread):
    data = pyqtSignal(str)
    cnt = 0
    def run(self):
        while(True):
            cnt = len(os.listdir(r''))
            self.data.emit(str(cnt))
            time.sleep(1)
                      
                  
if __name__ == '__main__':   
    app = QApplication(sys.argv)
    ex = Example()
    
    update_thread = UpdateData()
    update_thread.data.connect(ex.update_item_data)
    update_thread.start()
    
    sys.exit(app.exec_())