执行时报错
qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem
.
根据给出的提示可以看出错误原因是系统找不到Qt平台的插件，解决方法则是将PySide2或者PyQt5的plugins目录加入到QT_QPA_PLATFORM_PLUGIN_PATH环境变量里面。
例如：
#%%
import sys
import os
from PySide6 import QtCore, QtWidgets, QtGui
import PySide6
# 加入以下脚本即可正常显示窗口
dirname = os.path.dirname(PySide6.__file__)
plugin_path = os.path.join(dirname, 'plugins', 'platforms')
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = plugin_path
print(plugin_path)
#%%
class MyWidget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.button = QtWidgets.QPushButton("点这里")
self.layout = QtWidgets.QVBoxLayout(self)
self.layout.addWidget(self.button)
self.button.clicked.connect(self.showMessage)
@QtCore.Slot()
def showMessage(self):
msgBox = QtWidgets.QMessageBox()
msgBox.setText("Hello world")
msgBox.setStandardButtons(QtWidgets.QMessageBox.Ok)
ret = msgBox.exec()
if __name__ == "__main__":
app = QtWidgets.QApplication([])
widget = MyWidget()
widget.resize(300, 200)
widget.show()
sys.exit(app.exec())
二、修改配置文件，避免重复代码
首先 在VS中运行以下代码，找到 platforms 的 路径
import sys
import os
from PySide6 import QtCore, QtWidgets, QtGui
import PySide6
# 加入以下脚本即可正常显示窗口
dirname = os.path.dirname(PySide6.__file__)
plugin_path = os.path.join(dirname, 'plugins', 'platforms')
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = plugin_path
print(plugin_path)
第一个方法：修改PySide2的初始化文件"c:\users\XXX.virtualenvs\pyqt5-3bre18dc\lib\site-packages\PySide2_init_.py" ，在下图位置添加上述代码即可：
第二个方法：set QT_QPA_PLATFORM_PLUGIN_PATH='C:\ProgramData\Anaconda3\lib\site-packages\PySide6\plugins\platforms’
第三个方法：在cmd中运行sysdm.cpl ,在高级、环境变量中添加