发送WM_SETTINGCHANGE消息以刷新桌面 [英] Send WM_SETTINGCHANGE message to refresh desktop

问题描述

我设法通过此一线程序以编程方式更改了我的桌面背景:

I managed to programmatically change my desktop background via this one-liner:

DllCall("user32.dll", "int", "SystemParametersInfo", "int", 20, "int", 0, "str", $CmdLine[1], "int", 0)

…通过将所需的墙纸拖放到已编译的脚本上.

… by drag and drop of the desired wallpaper onto the compiled script.

我有另一个程序可以更改桌面，但是由于某种原因无法发送WM_SETTINGCHANGE消息(我可以看到键HKCU\Control Panel\Desktop\Wallpaper正在更新).如何发送此消息以触发墙纸刷新? WM_SETTINGCHANGE是正确的消息吗?还是第一个脚本是唯一的方法?

I have another program that changes the desktop but for some reason fails to send the WM_SETTINGCHANGE message (I can see the key HKCU\Control Panel\Desktop\Wallpaper getting updated). How can I send this message to trigger a wallpaper refresh? Is WM_SETTINGCHANGE the correct message? Or is the first script the only way?

我尝试了这个，但是不起作用:

I tried this but it doesn't work:

DllCall("user32.dll", "lresult", "SendMessage", _
     "int", 0xffff, _
     "int", 0x001a, _
     "int", 0x0014, _
     "str", "HKCU\Control Panel")

0xffff用于将消息广播到每个窗口，0x001a代表WM_SETTINGCHANGE，0x0014是spi_setdeskwallpaper的代码. Windows 7中的任务栏闪烁，但墙纸没有变化.

0xffff is for broadcasting the message to every window, 0x001a stands for WM_SETTINGCHANGE, 0x0014 is the code for spi_setdeskwallpaper. The taskbar in Windows 7 flickers but the wallpaper doesn't change.

如果您使用C，C ++或Visual Basic解决了我的问题，我自己将其转换为AutoIt(我只需要被调用函数的数字代码)即可.

If you solve my problem in C, C++ or Visual Basic I'll convert it to AutoIt myself (I just need the numerical codes of the called functions).

推荐答案

#include <SendMessage.au3>
#include <WindowsConstants.au3>

Dim $hWnd = WinGetHandle('[CLASS:Progman]')
_SendMessage($hWnd, $WM_COMMAND, 0x0001A220)

应该工作.让我知道是否可以，所以我可以更新此答案.

Should work. Let me know if it doesn't, so I can update this answer.

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