在 PySide6 中实现跨应用键盘输入：解决焦点切换问题

pip install PySide6 keyboard pygetwindow

import pygetwindow as gw
import time

def activate_and_type(target_window_title, symbol_to_write):
    """
    激活指定标题的窗口，并向其发送键盘输入。
    """
    try:
        # 获取所有包含指定标题的窗口
        windows = gw.getWindowsWithTitle(target_window_title)
        if not windows:
            print(f"错误：未找到标题包含 '{target_window_title}' 的窗口。")
            return

        # 通常选择第一个匹配的窗口
        target_window = windows[0]

        # 激活窗口并使其获得焦点
        # 注意：某些系统上，activate() 可能需要一些时间来完全生效
        target_window.activate()
        time.sleep(0.1) # 给予系统足够的时间来切换焦点

        # 执行键盘输入
        import keyboard
        keyboard.write(symbol_to_write)

    except Exception as e:
        print(f"执行激活和输入时发生错误: {e}")

# 示例用法
# activate_and_type("记事本", "Hello from PySide6!")

<!-- test/ui_file.ui 示例结构 (简化) -->
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <widget class="QWidget" name="centralwidget">
   <layout class="QVBoxLayout" name="verticalLayout">
    <widget class="QLineEdit" name="lineEdit_target_window">
     <property name="placeholderText">
      <string>输入目标窗口标题 (例如: 记事本)</string>
     </property>
    </widget>
    <widget class="QPushButton" name="pushButton_arrow">
     <property name="text">
      <string>输入箭头 ⇒</string>
     </property>
    </widget>
    <widget class="QPushButton" name="pushButton_checkmark">
     <property name="text">
      <string>输入对勾 ✔</string>
     </property>
    </widget>
    <widget class="QPushButton" name="pushButton_cross">
     <property name="text">
      <string>输入叉号 ✖</string>
     </property>
    </widget>
   </layout>
  </widget>
 </widget>
</ui>

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

# -------------------- 窗口激活和输入函数 --------------------
def write_symbol_to_external_app(symbol, target_window_title):
    """
    尝试激活指定标题的外部窗口，并向其发送符号输入。
    """
    if not target_window_title:
        print("错误：目标窗口标题不能为空。")
        return

    try:
        # 获取所有包含指定标题的窗口
        windows = gw.getWindowsWithTitle(target_window_title)
        if not windows:
            print(f"错误：未找到标题包含 '{target_window_title}' 的窗口。请确保窗口已打开且标题正确。")
            return

        # 优先选择第一个匹配的窗口
        target_window = windows[0]

        # 激活窗口并使其获得焦点
        # maximize() 和 activate() 确保窗口可见并获得焦点
        # target_window.maximize() # 根据需要决定是否最大化
        target_window.activate()

        # 给予系统足够的时间来处理窗口激活
        time.sleep(0.1) 

        # 执行键盘输入
        keyboard.write(symbol)
        print(f"已尝试向 '{target_window.title}' 输入: {symbol}")

    except IndexError:
        print(f"错误：未找到标题包含 '{target_window_title}' 的窗口。")
    except Exception as e:
        print(f"在向外部应用输入时发生错误: {e}")

# -------------------- PySide6 应用程序设置 --------------------
app = QApplication([])

# 假设 UI 文件在 "test" 文件夹中
ui_file_path = "test/ui_file.ui" # 请确保路径正确
ui_file = QFile(ui_file_path)
if not ui_file.open(QFile.ReadOnly):
    print(f"错误：无法打开 UI 文件 '{ui_file_path}'。请检查路径和文件是否存在。")
    exit(-1) # 退出程序

loader = QUiLoader()
window = loader.load(ui_file)
ui_file.close()

# 设置窗口为置顶，方便操作
window.setWindowFlags(window.windowFlags() | Qt.WindowStaysOnTopHint)

# 查找 UI 控件
pushButton_arrow = window.findChild(QPushButton, "pushButton_arrow")
pushButton_checkmark = window.findChild(QPushButton, "pushButton_checkmark")
pushButton_cross = window.findChild(QPushButton, "pushButton_cross")
lineEdit_target_window = window.findChild(QLineEdit, "lineEdit_target_window")

# 设置默认的目标窗口标题，方便测试
if lineEdit_target_window:
    # 示例：如果您想默认瞄准记事本，可以设置为 "记事本"
    # 请注意，实际的窗口标题可能包含 "无标题 - 记事本" 或其他内容
    lineEdit_target_window.setText("记事本") 

# 连接按钮点击事件到我们的输入函数
if pushButton_arrow:
    pushButton_arrow.clicked.connect(lambda: write_symbol_to_external_app(
        "⇒", lineEdit_target_window.text() if lineEdit_target_window else ""
    ))
if pushButton_cross:
    pushButton_cross.clicked.connect(lambda: write_symbol_to_external_app(
        "✖", lineEdit_target_window.text() if lineEdit_target_window else ""
    ))
if pushButton_checkmark:
    pushButton_checkmark.clicked.connect(lambda: write_symbol_to_external_app(
        "✔", lineEdit_target_window.text() if lineEdit_target_window else ""
    ))

window.show()
app.exec()