项目备份
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76
templates/app_JsToPy.py
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76
templates/app_JsToPy.py
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import webview
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import threading
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import time,os
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CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
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# ---------------------- 1. 定义供 JS 调用的 Python 函数 ----------------------
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class Api:
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"""暴露给 JS 的 Python 接口类(所有方法都会被 JS 访问)"""
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def __init__(self):
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self.window = None # 保存窗口实例,用于 Python 主动调用 JS
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def set_window(self, window):
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"""初始化时绑定窗口实例"""
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self.window = window
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def python_hello(self, name):
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"""JS 调用的同步函数:接收参数,返回结果"""
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print(f"[Python] 收到 JS 调用,参数:{name}")
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return f"Hello {name}! 这是 Python 返回的消息"
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def python_async_task(self, duration):
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"""JS 调用的异步函数:模拟耗时任务(不阻塞前端)"""
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def async_task():
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print(f"[Python] 开始异步任务,耗时 {duration} 秒")
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time.sleep(int(duration))
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# 异步任务完成后,主动调用 JS 函数通知结果
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self.window.evaluate_js(f'js_receive_python_msg("异步任务完成!耗时 {duration} 秒")')
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print(f"[Python] 异步任务结束")
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# 启动子线程执行异步任务,避免阻塞 UI
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threading.Thread(target=async_task, daemon=True).start()
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return "异步任务已启动,请等待结果通知"
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def python_close_window(self):
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"""JS 调用关闭窗口"""
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print("[Python] 收到关闭窗口请求")
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self.window.destroy()
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# ---------------------- 2. Python 主动调用 JS 函数 ----------------------
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def python_call_js_periodically(window):
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"""Python 定时调用 JS 函数(模拟主动推送数据)"""
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count = 0
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while window.is_alive():
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count += 1
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# 执行 JS 函数,传递参数
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window.evaluate_js(f'js_receive_python_msg("Python 主动推送:第 {count} 条消息")')
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time.sleep(3) # 每 3 秒推送一次
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if count >= 5:
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break
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# ---------------------- 3. 启动窗口 ----------------------
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if __name__ == "__main__":
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# 创建 API 实例
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api = Api()
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# 加载本地 HTML 文件(也可加载远程 URL:url="https://xxx.com")
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window = webview.create_window(
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title="PyWebView 双向通信示例",
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url=f"file:///{CURRENT_DIR}/templates/app_JsToPy.html",
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resizable=True,
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js_api=api # 关键:暴露 Python API 给 JS
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)
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# 绑定窗口实例到 API(供异步任务调用 JS)
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api.set_window(window)
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# 启动 Python 主动调用 JS 的线程(非阻塞)
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t = threading.Thread(target=python_call_js_periodically, args=(window,), daemon=True)
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t.start()
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# 运行窗口(阻塞主线程)
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webview.start(
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debug=True, # 开发环境开启调试,生产环境关闭
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http_server=True # 启用内置 HTTP 服务器(加载本地 HTML 必需)
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)
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