问我需要得到超文本标记语言的源代码作为字符串CEFPython

EN

def save_screenshot(browser):    
    # Browser object provides GetUserData/SetUserData methods
    # for storing custom data associated with browser. The
    # "OnPaint.buffer_string" data is set in RenderHandler.OnPaint.
    buffer_string = browser.GetUserData("OnPaint.buffer_string")
    if not buffer_string:
        raise Exception("buffer_string is empty, OnPaint never called?")
    mainFrame = browser.GetMainFrame()
    print("Main frame is ", mainFrame)
    # print("buffer string" ,buffer_string)

    # visitor object
    visitorObj = cef_string()
    temp = mainFrame.GetSource(visitorObj).GetString()
    print("temp : ", temp)

    visitorText = mainFrame.GetText(temp)
    siteHTML = mainFrame.GetSource(visitorText)
    print("siteHTML is ", siteHTML)