问如何在不使用applescript打开的情况下获取弹出菜单中的项目数？

EN

tell application "System Events"
    tell process "Your application"
        --we need to menu to appear first
        click pop up button 1 of window 1
        --now the menu appeared we can count the items in it
        count menu items of menu 1 of pop up button 1 of window 1
        --now hide the menu again by pressing escape
        key code 53
    end tell
end tell

set menuItemToSelect to "Title of menu item I prefer to check"

tell application "System Events"
    tell process "Your Application"
        tell pop up button 1 of window 1
            --Only continue if the menu item isn't already selected
            if value of it is not equal to menuItemToSelect then
                --we need to menu to appear first
                click it
                --now the menu appeared we can get the items
                set menuItemTitles to name of menu items of menu 1
                --check if the menu item exists
                if menuItemToSelect is in menuItemTitles then
                    --menu item exists; click on it
                    click menu item menuItemToSelect of menu 1
                else
                    --the menu item to select doesn't exist; hide the menu
                    key code 53
                end if
            end if
        end tell
    end tell
end tell