我尝试在一个窗口上显示图片（最多6张）。在此之前，您必须在第一个窗口中输入一个名称（以下代码未提供）。
照片会自动从我的相机传输到计算机，因此一开始文件夹中将没有照片，但是一段时间后可能直到6。
通过运行代码，不会出现任何错误，但是当所有6张图像都位于正确的文件夹中时，窗口olny将完全加载。因此，sys.exit(app.exec_())运行之前什么也不会显示。
我尝试在sys.exit(app.exec_())之后打电话给ui.update_picture(MainWindow)，但随后Skript停了下来。
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QIcon, QPixmap
import sys
import os
import time
path = "C:/Users/benni/Desktop/" # given from the first Window
folder_name = "exit_folder_test" # given from the first Window
source = "test" # given
os.makedirs(path + folder_name)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.resize(1920, 1080)
self.frame = QtWidgets.QWidget(MainWindow)
start_x = 20 # origin from the grid
start_y = 80
distance = 40 # distance between the pictures
global image_width
image_width = 600
global image_height
image_height = 400
self.picture1 = QtWidgets.QLabel(self.frame) # all the different fields for the pictures, grid-layout
self.picture1.setGeometry(QtCore.QRect(start_x, start_y, image_width, image_height))
self.picture2 = QtWidgets.QLabel(self.frame)
self.picture2.setGeometry(QtCore.QRect((start_x + image_width + distance), start_y, image_width, image_height))
self.picture3 = QtWidgets.QLabel(self.frame)
self.picture3.setGeometry(QtCore.QRect((start_x + 2*image_width + 2*distance), start_y, image_width, image_height))
self.picture4 = QtWidgets.QLabel(self.frame)
self.picture4.setGeometry(QtCore.QRect((start_x), (start_y + image_height + distance), image_width, image_height))
self.picture5 = QtWidgets.QLabel(self.frame)
self.picture5.setGeometry(QtCore.QRect((start_x + image_width + distance), (start_y + image_height + distance), image_width, image_height))
self.picture6 = QtWidgets.QLabel(self.frame)
self.picture6.setGeometry(QtCore.QRect((start_x + 2*image_width + 2*distance), (start_y + image_height + distance), image_width, image_height))
self.print_button = QtWidgets.QPushButton(self.frame)
self.print_button.setGeometry(QtCore.QRect((start_x + 3*image_width + 2*distance) - 74, (start_y + 2*image_height + 2*distance), 75, 24))
MainWindow.setCentralWidget(self.frame)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def update_picture(self, MainWindow): # funktions to add pictures to the fields in setupUi
pixmap1 = QPixmap(path + folder_name + "/image1.jpg").scaled(image_width, image_height)
self.picture1.setPixmap(pixmap1)
pixmap2 = QPixmap(path + folder_name + "/image2.jpg").scaled(image_width, image_height)
self.picture2.setPixmap(pixmap2)
pixmap3 = QPixmap(path + folder_name + "/image3.jpg").scaled(image_width, image_height)
self.picture3.setPixmap(pixmap3)
pixmap4 = QPixmap(path + folder_name + "/image4.jpg").scaled(image_width, image_height)
self.picture4.setPixmap(pixmap4)
pixmap5 = QPixmap(path + folder_name + "/image5.jpg").scaled(image_width, image_height)
self.picture5.setPixmap(pixmap5)
pixmap6 = QPixmap(path + folder_name + "/image6.jpg").scaled(image_width, image_height)
self.picture6.setPixmap(pixmap6)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "Fotobox"))
self.print_button.setText(_translate("MainWindow", "print"))
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
recording = True
amount = 0
number = 0
while recording == True:
pictures = os.listdir(path + source) # reads the content of the given folder
amount_update = len(pictures)
if amount != amount_update: # checks if the amount of files in the folder has changed
amount = amount_update
for picture_name in pictures:
number += 1
time.sleep(1) # wait until the picture is transferred
picture_new_name = "image" + str(number) + ".jpg"
os.rename(path + source + "/" + picture_name, path + folder_name + "/" + picture_new_name) # renames all the given pictures and transfer them in a new folder
if number > 0 and number < 7:
ui.update_picture(MainWindow)
print(number)
else:
recording = False
recording = False
sys.exit(app.exec_())
答案 0 :(得分：0)
此问题与app.exec_（）无关，问题在于您有一个阻止GUI的任务阻止了它的正确显示，因此在这种情况下，您必须在另一个线程中运行该任务并通知GUI通过信号：
import os
import time
from PyQt5 import QtCore, QtGui, QtWidgets
path = "C:/Users/benni/Desktop/" # given from the first Window
folder_name = "exit_folder_test" # given from the first Window
source = "test"
extension = "jpg"
if not os.path.isdir(os.path.join(path, folder_name)):
os.makedirs(os.path.join(path, folder_name))
class PictureWorker(QtCore.QObject):
updateSignal = QtCore.pyqtSignal()
@QtCore.pyqtSlot()
def search(self):
recording = True
number = 0
amount = 0
while recording:
pictures = []
for file in os.listdir(os.path.join(path, source)):
if file.endswith(".{}".format(extension)):
pictures.append(file)
amount_update = len(pictures)
if (
amount != amount_update
): # checks if the amount of files in the folder has changed
amount = amount_update
for picture_name in pictures:
number += 1
time.sleep(1) # wait until the picture is transferred
picture_new_name = "image{}.{}".format(number, extension)
os.rename(
os.path.join(path, source, picture_name),
os.path.join(path, folder_name, picture_new_name),
) # renames all the given pictures and transfer them in a new folder
if 0 < number < 7:
print(number)
self.updateSignal.emit()
else:
recording = False
recording = False
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
widget = QtWidgets.QWidget()
self.setCentralWidget(widget)
grid_layout = QtWidgets.QGridLayout(widget)
rows, cols = 2, 3
self._labels = []
image_width, image_height = 600, 400
for row in range(rows):
for col in range(cols):
label = QtWidgets.QLabel(alignment=QtCore.Qt.AlignCenter)
label.setFixedSize(image_width, image_height)
grid_layout.addWidget(label, row, col)
self._labels.append(label)
self.print_button = QtWidgets.QPushButton("print")
grid_layout.addWidget(self.print_button, 3, 3)
self.resize(1920, 1080)
def update_image(self):
for i, label in enumerate(self._labels):
pixmap = QtGui.QPixmap(
os.path.join(
path, folder_name, "image{}.{}".format(i + 1, extension)
)
)
label.setPixmap(pixmap)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
worker = PictureWorker()
worker.updateSignal.connect(w.update_image)
thread = QtCore.QThread()
thread.start()
worker.moveToThread(thread)
QtCore.QTimer.singleShot(0, worker.search)
sys.exit(app.exec_())