解决PySide6应用无法向外部程序输入字符的问题

from PySide6.QtWidgets import QApplication, QPushButton
from PySide6.QtCore import QFile, Qt
from PySide6.QtUiTools import QUiLoader
import keyboard, time

app = QApplication([])

# 假设UI文件位于"test"文件夹
ui_file = QFile("test/ui_file.ui")
ui_file.open(QFile.ReadOnly)
loader = QUiLoader()
window = loader.load(ui_file)
ui_file.close()

# 设置窗口始终置顶
window.setWindowFlags(window.windowFlags() | Qt.WindowStaysOnTopHint)

# 获取UI中的按钮
pushButton_arrow = window.findChild(QPushButton, "pushButton_arrow")
pushButton_checkmark = window.findChild(QPushButton, "pushButton_checkmark")
pushButton_cross = window.findChild(QPushButton, "pushButton_cross")

def write_symbol(symbol):
    keyboard.write(symbol)

# 绑定按钮点击事件
pushButton_arrow.clicked.connect(lambda: write_symbol("⇒"))
pushButton_cross.clicked.connect(lambda: write_symbol("✖"))
pushButton_checkmark.clicked.connect(lambda: write_symbol("✔"))

window.show()
app.exec()

pip install pygetwindow

from PySide6.QtWidgets import QApplication, QPushButton
from PySide6.QtCore import QFile, Qt
from PySide6.QtUiTools import QUiLoader
import keyboard
import time
import pygetwindow as gw # 引入pygetwindow库

app = QApplication([])

# 假设UI文件位于"test"文件夹
ui_file = QFile("test/ui_file.ui")
ui_file.open(QFile.ReadOnly)
loader = QUiLoader()
window = loader.load(ui_file)
ui_file.close()

# 设置窗口始终置顶（可选，但有助于调试）
window.setWindowFlags(window.windowFlags() | Qt.WindowStaysOnTopHint)

# 获取UI中的按钮
pushButton_arrow = window.findChild(QPushButton, "pushButton_arrow")
pushButton_checkmark = window.findChild(QPushButton, "pushButton_checkmark")
pushButton_cross = window.findChild(QPushButton, "pushButton_cross")

# 定义一个函数来激活指定标题的窗口
def activate_target_window(target_window_title):
    try:
        # 查找所有标题中包含目标字符串的窗口
        # 注意：getWindowsWithTitle返回一个列表，通常我们取第一个匹配项
        target_windows = gw.getWindowsWithTitle(target_window_title)
        if target_windows:
            target_window = target_windows[0]
            # 激活窗口，使其获得焦点
            target_window.activate()
            # 某些情况下，可能需要短暂延迟以确保窗口完全激活
            time.sleep(0.1)
            return True
        else:
            print(f"未找到标题包含 '{target_window_title}' 的窗口。")
            return False
    except Exception as e:
        print(f"激活窗口时发生错误: {e}")
        return False

# 修改后的写入函数，先激活目标窗口再写入
def write_symbol_to_external(symbol, target_window_title="记事本"): # 默认目标为记事本
    if activate_target_window(target_window_title):
        keyboard.write(symbol)
    else:
        print("无法向外部程序写入，目标窗口未激活。")

# 绑定按钮点击事件，现在它们会调用新的写入函数
pushButton_arrow.clicked.connect(lambda: write_symbol_to_external("⇒", "记事本"))
pushButton_cross.clicked.connect(lambda: write_symbol_to_external("✖", "记事本"))
pushButton_checkmark.clicked.connect(lambda: write_symbol_to_external("✔", "记事本"))

window.show()
app.exec()

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>200</width>
    <height>150</height>
   </rect>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <widget class="QPushButton" name="pushButton_arrow">
      <property name="text">
       <string>写入箭头 ⇒</string>
      </property>
     </widget>
    </item>
    <item>
     <widget class="QPushButton" name="pushButton_checkmark">
      <property name="text">
       <string>写入对勾 ✔</string>
      </property>
     </widget>
    </item>
    <item>
     <widget class="QPushButton" name="pushButton_cross">
      <property name="text">
       <string>写入叉号 ✖</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>