Python:PostMessage后台发送鼠标消息给模拟器无效的解决办法

• 问题
• 过程
• 解决

在使用自己写的 Python开发游戏自动化后台脚本过程中，发现其对安卓模拟器这种Qt5QWindowIcon类名的窗口不起作用，下面是解决办法

首先通过spy++确定了需要发送消息的窗口不是最上层的Qt5QWindowIcon类，而是第四级RenderWindowWindow,Qt5QWindowIcon这一窗口
其次通过监视其鼠标消息，发现实际用鼠标点击的消息队列如下：
并且需要注意的是在WM_LBUTTONDOWN这条消息中，fwKeys参数为MK_LBUTTON，而原代码中没有考虑这一参数，直接设置0.
在进一步的验证过程中，发现只要涵盖最后三条消息即可成功。

首先修改原左键按下函数：

    def __left_down(self, handle: HWND, x: int, y: int):
        """在坐标(x, y)按下鼠标左键

        Args:
            handle (HWND): 窗口句柄
            x (int): 横坐标
            y (int): 纵坐标
        """
        # https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-lbuttondown
        wparam = 0x001 # MK_LBUTTON
        lparam = y << 16 | x
        self.__PostMessageW(handle, self.__WM_LBUTTONDOWN, wparam, lparam)

补充参数：

__SendMessageW = windll.user32.SendMessageW
__WM_SETCURSOR = 0x20
__WM_MOUSEACTIVATE = 0x21

__HTCLIENT = 1
__MA_ACTIVATE = 1

补充函数：

    def __set_cursor(self, handle: HWND, msg):
        """
        @Description : Sent to a window if the mouse causes the cursor to move within a window and mouse input is not captured
        ---------
        @Args : handle (HWND): 窗口句柄, msg : setcursor消息
        -------
        @Returns : 
        -------
        """
        # https://docs.microsoft.com/en-us/windows/win32/menurc/wm-setcursor
        lparam = (msg << 16) | self.__HTCLIENT
        self.__SendMessageW(handle, self.__WM_SETCURSOR, handle, lparam)

    def __activate_mouse(self, handle: HWND):
        """
        @Description : 激活窗口接受鼠标消息
        ---------
        @Args : handle (HWND): 窗口句柄
        -------
        @Returns : 
        -------
        """
        # https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-mouseactivate
        lparam = (self.__WM_LBUTTonDOWN << 16) | self.__HTCLIENT
        self.__SendMessageW(handle, self.__WM_MOUSEACTIVATE, self.__handle, lparam)

完整的点击函数为：

    def mouse_click(self, x, y, times=0.5):
        """
        @description : 单击左键
        ---------
        @param : 位置坐标x,y 单击后延时times(s)
        -------
        @Returns : 
        -------
        """
        self.__set_cursor(self.__clickhandle, self.__WM_MOUSEACTIVATE)
        self.__move_to(self.__clickhandle, int(x / scale), int(y / scale))
        self.__activate_mouse(self.__clickhandle)
        self.__set_cursor(self.__clickhandle, self.__WM_LBUTTONDOWN)
        self.__left_down(self.__clickhandle, int(x / scale), int(y / scale))
        self.__move_to(self.__clickhandle, int(x / scale), int(y / scale))
        self.__left_up(self.__clickhandle, int(x / scale), int(y / scale))
        time.sleep(times)

仅含最后3条消息的精简版点击函数：

    def mouse_click(self, x, y, times=0.5):
        """
        @description : 单击左键
        ---------
        @param : 位置坐标x,y 单击后延时times(s)
        -------
        @Returns : 
        -------
        """
        # self.__set_cursor(self.__clickhandle, self.__WM_MOUSEACTIVATE)
        # self.__move_to(self.__clickhandle, int(x / scale), int(y / scale))
        # self.__activate_mouse(self.__clickhandle)
        # self.__set_cursor(self.__clickhandle, self.__WM_LBUTTONDOWN)
        self.__left_down(self.__clickhandle, int(x / scale), int(y / scale))
        self.__move_to(self.__clickhandle, int(x / scale), int(y / scale))
        self.__left_up(self.__clickhandle, int(x / scale), int(y / scale))
        time.sleep(times)