Максим's questions

程序中有两个线程，它们依次必须在显示器上显示它们的值LCD，但只显示第二个线程的数据。

必须显示第一个流float，然后显示第二个int。

from PyQt5 import QtCore, QtWidgets, QtGui
import sys

class FirstThread(QtCore.QThread):
    first_thread_signal = QtCore.pyqtSignal(float)
    first_done_signal = QtCore.pyqtSignal()
    def __init__(self):
        super().__init__()
        self.flag = True
        self.done = True
        self.num = 8
    
    def run(self):
        while self.num < 24 and self.flag:
            if self.done:
                self.first_thread_signal.emit(self.counter(self.num))
                self.num += 1
                self.first_done_signal.emit()
                self.msleep(1000)
            else:
                pass         
    
    def counter(self, num):
        self.count = 0
        while num > 0:
            self.count += (2 * num - 1) / 2 ** num
            num -= 1
        return float('{0:.3f}'.format(self.count))

class SecondThread(QtCore.QThread):
    second_thread_signal = QtCore.pyqtSignal(int)
    second_done_signal = QtCore.pyqtSignal()
    def __init__(self):
        super().__init__()
        self.flag = True
        self.done = False
        self.num = 51

    def run(self):
        while self.num < 67 and self.flag:
            if self.done:
                self.second_thread_signal.emit(self.counter(self.num))
                self.num += 1
                self.second_done_signal.emit()
                self.msleep(1000)
            else:
                pass
    
    def counter(self, num):
        return num // 5

class Window(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(400, 200)
        self.centralwidget = QtWidgets.QWidget()
        self.lcdNumber = QtWidgets.QLCDNumber(self.centralwidget)
        self.lcdNumber.setGeometry(QtCore.QRect(60, 50, 270, 60))
        self.start = QtWidgets.QPushButton(self.centralwidget)
        self.start.setGeometry(QtCore.QRect(70, 150, 90, 30))
        self.start.setText("Старт")
        self.stop = QtWidgets.QPushButton(self.centralwidget)
        self.stop.setGeometry(QtCore.QRect(230, 150, 90, 30))
        self.stop.setText("Стоп")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(170, 20, 90, 20))
        self.setCentralWidget(self.centralwidget)
        #first thread
        self.first_thread = FirstThread()
        self.first_thread.first_thread_signal.connect(self.first_lcd)
        self.first_thread.first_done_signal.connect(self.first_thread_done)
        #second thread
        self.second_thread = SecondThread()
        self.second_thread.second_thread_signal.connect(self.second_lcd)
        self.second_thread.second_done_signal.connect(self.second_thread_done)

        self.start.clicked.connect(self.launch_threads)
        self.stop.clicked.connect(self.stop_threads)

    def first_thread_done(self):
        self.first_thread.done = False
        self.second_thread.done = True

    def second_thread_done(self):
        self.first_thread.done = True
        self.second_thread.done = False

    def first_lcd(self, value):
        self.label.setText("Первый поток")
        self.lcdNumber.display(value)

    def second_lcd(self, value):
        self.label.setText("Второй поток")
        self.lcdNumber.display(value)

    def launch_threads(self):
        self.first_thread.flag = True
        self.second_thread.flag = True
        self.first_thread.done = True
        self.second_thread.done = False
        self.first_thread.start()
        self.second_thread.start()

    def stop_threads(self):
        self.first_thread.flag = False
        self.second_thread.flag = False

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    main_window = Window()
    main_window.show()
    sys.exit(app.exec_())

该程序在单独的窗口中绘制和弦和铭文，我需要添加选择字体和阴影样式以绘制和弦的功能，我使用通过按键调用的对话框来执行此操作，我从字体，但在绘制自身时出现错误

这是代码：

import sys
from PyQt5.QtWidgets import QWidget, QApplication, QMainWindow, QPushButton, QLabel, QFontDialog
from PyQt5.QtGui import QPainter, QColor, QPen, QFont
from PyQt5.QtCore import Qt, QRect

class Example(QWidget):

    def __init__(self, mainwindow):
        super().__init__()
        self.mainwindow = mainwindow
        self.initUI()

    def initUI(self):
        self.text = '\u0412\u0020\u043b\u0435\u0432\u043e\u043c\u0020\u043d\u0438\u0436\u043d\u0435\u043c\u0020\u0443\u0433\u043b\u0443\u0020\u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u043d\u0430\u0020\u0445\u043e\u0440\u0434\u0430\u002e'
        self.setGeometry(100, 100, 380, 270)
        self.setWindowTitle('ЛР №3')
        self.show()

    def paintEvent(self, event):
        qp = QPainter()
        qp.begin(self)
        self.drawText(event,qp)
        self.drawChord(qp)
        qp.end()

    def drawText(self, event, qp):
        qp.setPen(QColor(168, 34, 3))
        self.font = self.mainwindow.draw_font
        qp.setFont(self.font)
        qp.drawText(event.rect(), Qt.AlignRight, self.text)

    def drawChord(self, qp):
        pen = QPen(Qt.black, 6, Qt.SolidLine)
        qp.setPen(pen)
        qp.drawChord(0, 200, 320, 140, 30 * 16, 120 * 16)

class window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(565, 232)
        font = QFont()
        font.setPointSize(16)
        self.centralwidget = QWidget()
        self.centralwidget.setObjectName("centralwidget")
        self.label = QLabel(self.centralwidget)
        self.label.setGeometry(QRect(120, 10, 351, 31))
        self.label.setObjectName("label")
        self.label_2 = QLabel(self.centralwidget)
        self.label_2.setGeometry(QRect(120, 55, 391, 25))
        self.label_2.setObjectName("label_2")
        self.label_3 = QLabel(self.centralwidget)
        self.label_3.setGeometry(QRect(120, 90, 361, 31))
        self.label_3.setObjectName("label_3")
        self.pushButton = QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QRect(180, 170, 211, 31))
        self.pushButton.setObjectName("pushButton")
        self.label.setText("Нажмите F1 чтобы выбрать кисть")
        self.label_2.setText("Нажмите F2 чтобы выбрать .txt файл")
        self.label_3.setText("Нажмите F3 чтобы выбрать шрифт")
        self.pushButton.setText("Нарисовать")
        self.label.setFont(font)
        self.label_2.setFont(font)
        self.label_3.setFont(font)
        self.pushButton.setFont(font)
        self.setCentralWidget(self.centralwidget)

        self.pushButton.clicked.connect(self.draw)

        self.draw_font = QFont('Decorative', 10)


    def draw(self):
        self.ex = Example(mainwindow = self)

    def keyPressEvent(self, press):
        if press.key() == Qt.Key_F1:
            pass
        elif press.key() == Qt.Key_F2:
            pass
        elif press.key() == Qt.Key_F3:
            self.draw_font = QFontDialog.getFont()
            print(self.draw_font)

if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = window()
    window.show()
    sys.exit(app.exec_())

我需要在按下按钮时Stop，线程停止工作，并且界面不会卡住，然后我可以单击Start以使线程从停止的位置继续工作。

from PyQt5 import QtCore, QtGui, QtWidgets
import sys

"""Класс инициализирующий первый поток"""
class first_thread(QtCore.QThread):
    def __init__(self, mainwindow, parent = None):
        super().__init__()
        self.mainwindow = mainwindow

    def run(self):
        self.count = 0
        while self.count < 100:
            self.count += 1
            self.mainwindow.first_lcd.display(self.count)
            QtCore.QThread.msleep(100)

"""Класс инициализирующий второй поток"""
class second_thread(QtCore.QThread):
    def __init__(self, mainwindow, parent = None):
        super().__init__()
        self.mainwindow = mainwindow

    def run(self):
        self.count = 0
        while self.count < 100:
            self.count += 1
            self.mainwindow.second_lcd.display(self.count)
            QtCore.QThread.msleep(100)

"""Класс, который создает окно и распологает на нем виджеты"""
class MyWindow(QtWidgets.QMainWindow):
    def __init__(self, parent = None):
        super().__init__()
        #Объявляем центральный виджет, на нем будут располагаться остальные
        self.resize(810, 310)
        self.centralwidget = QtWidgets.QWidget()
        #Располагаем два LCD Number
        self.first_lcd = QtWidgets.QLCDNumber(self.centralwidget)
        self.first_lcd.setGeometry(QtCore.QRect(10, 70, 380, 80))
        self.second_lcd = QtWidgets.QLCDNumber(self.centralwidget)
        self.second_lcd.setGeometry(QtCore.QRect(420, 70, 370, 80))
        #Распологаем кнопки start и stop 
        self.start_btn = QtWidgets.QPushButton(self.centralwidget)
        self.start_btn.setGeometry(QtCore.QRect(270, 240, 110, 50))
        self.start_btn.setText("Start")

        self.stop_btn = QtWidgets.QPushButton(self.centralwidget)
        self.stop_btn.setGeometry(QtCore.QRect(410, 240, 110, 50))
        self.stop_btn.setText("Stop")
        #Располагаем два текстовых указателя(label)
        font = QtGui.QFont()
        font.setPointSize(16)
        self.first_thr_lbl = QtWidgets.QLabel(self.centralwidget)
        self.first_thr_lbl.setGeometry(QtCore.QRect(130, 20, 160, 30))
        self.first_thr_lbl.setFont(font)
        self.first_thr_lbl.setText("Первый поток")

        self.second_thr_lbl = QtWidgets.QLabel(self.centralwidget)
        self.second_thr_lbl.setGeometry(QtCore.QRect(550, 20, 150, 30))
        self.second_thr_lbl.setFont(font)
        self.second_thr_lbl.setText("Второй поток")
        #Располагаем центральный виджет на окно
        self.setCentralWidget(self.centralwidget)

        #Объявляем потоки
        self.first_thread = first_thread(mainwindow = self)
        self.second_thread = second_thread(mainwindow = self)

        self.start_btn.clicked.connect(self.launch_threads)#Кнопка подает сигнал в функцию, запускающую потоки
        self.stop_btn.clicked.connect(self.stop_threads)#Кнопка подает сигнал в функцию, останавливающую потоки

    #Функция, запускающая потоки
    def launch_threads(self):
        self.first_thread.start()
        self.second_thread.start()
    #Функция, останавливающая потоки
    def stop_threads(self):
        self.first_thread.usleep()
        self.second_thread.usleep()

"""Запуск скрипта"""
app = QtWidgets.QApplication(sys.argv)
window = MyWindow()
window.show()
sys.exit(app.exec_())

我从 tkinter 切换到 PyQt5. 作为练习，我想创建一个简单的图像编辑器也使用PIL. 到目前为止，该程序只有Label一个按钮可以调用文件选择对话框，并且在选择一个文件时，在7个图像中，仅显示一个图像Label，在其他情况下，以下是错误： http： //mmolabel.ru/ wp-content/uploads/2018 /03/pamyat-ne-mozhet-byt-read.jpg

这是小部件代码

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(70, 40, 651, 391))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(644, 560, 131, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Здесь будет фото"))
        self.pushButton.setText(_translate("MainWindow", "Выберите изображение"))

这是逻辑文件，你需要运行它，并且从与第一个相同的目录中运行

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QFileDialog
from pr_visual import Ui_MainWindow
import sys
from PIL import Image
from PIL.ImageQt import ImageQt
def opendialog():
    dialog = QFileDialog()
    fname = dialog.getOpenFileName(None, 'Open file', '/')[0]
    img = Image.open(fname)
    width = img.size[0]
    height = img.size[1]
    qimg = ImageQt(img)
    width = img.size[0]
    height = img.size[1]
    pixmap = QtGui.QPixmap.fromImage(qimg)
    ui.label.setGeometry(QtCore.QRect(0, 0, width, height))
    ui.label.setPixmap(pixmap)

#Create main window
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(window)
window.setWindowTitle('PR')
window.show()

#Logic
ui.pushButton.clicked.connect( opendialog )

#mainloop
sys.exit(app.exec_())