如何向所有的资源管理器窗口发送刷新消息

http://www.cnblogs.com/flappy/archive/2006/06/22/432329.html

如何向所有的资源管理器窗口发送刷新消息

     原始问题是这样的：我想编程实现文件扩展名的显示与隐藏，实际上就是修改HKCU/Software/Microsoft/Windows/ CurrentVersion/Explorer/Advanced" 的HideFileExt的值，但问题是将此键值修改后，系统并不知道这个更新，我想应该是向系统广播某个消息（或者是某些消息）。我试着向 windows发送各种各样的消息，包括试了BroadcastSystemMessage、SHChangeNotify、 SystemParametersInfo等函数，但是都没有成功。

进一步一个折衷的问题是：我发现，在更改上面的注册表键值以后，在资源管理器窗口中按F5键刷新并起不到作用，只有点右键刷新才能使扩展名隐藏或显 示。但是，如果已经在某个资源管理器窗口中点右键刷新了，则其它的资源管理器窗口可以通过F5键来得到隐藏或显示扩展名的目的。
     退一步，我应该如何向所有打开的资源管理器窗口都发送F5按键消息呢？我的思路是通过PostMessage(handle,WM_KEYDOWN, VK_F5,0);PostMessage(handle,WM_KEYUP,VK_F5,0);但是handle的确定相当困难，我试过用窗口的顶级 handle及里面的FolderView的句柄，都不起作用。而且，我想，即使是找到用VK_F5遍历发送消息的方法，也会引起巨大的系统开销。而且， 由于所有的资源管理器窗口都被遍历一遍（这是不是意味着所有的资源管理器窗口都会获得一次焦点？），如果遍历顺序控制不好的话会引起各窗口覆盖顺序的变 化，肯定会让使用者感到不爽。
    问题大概就这么多，诸位有没有什么好的办法啊？请各路高手不吝赐教，多谢了先。

posted on 2006-06-22 08:53 李现民 阅读(401) 评论(2)  编辑 收藏 所属分类: Help

FeedBack:

#1楼 

2007-12-19 15:57 | renke [未注册用户]

查询相关SystemParametersInfo的接口
你可以解决此问题
  回复  引用  查看    

#2楼 

2007-12-20 10:44 | renke [未注册用户]
HWNDhCurWnd = NULL;
TCHARszClassName[MAX_PATH] = {0};

hCurWnd = ::GetTopWindow(NULL);
while(IsWindow(hCurWnd))
{
GetClassName(hCurWnd, szClassName, MAX_PATH);
if( _tcscmp( szClassName, _T("CabinetWClass") ) == 0 || _tcscmp(szClassName, _T("ExploreWClass") )== 0 )
{
::PostMessage(hCurWnd, WM_COMMAND, 41504, 0);
}
hCurWnd = ::GetNextWindow(hCurWnd, GW_HWNDNEXT);
continue;
}

http://osdir.com/ml/version-control.cvs.tortoisecvs.user/2003-09/msg00063.html
http://osdir.com/ml/version-control.cvs.tortoisecvs.user/2003-09/msg00076.html
http://osdir.com/ml/version-control.cvs.tortoisecvs.user/2003-09/msg00070.html

Update window after Update, Commit, &c: msg#00063

At 12:32 PM 9/12/2003, Torsten Martinsen wrote:

Per Lindberg wrote:

Wouldn't it be nice if TortoiseCVS could update the window (= F5)
after an Update, Commit etc? Possible? Old question?

TortoiseCVS already does this:

The files & directories in the file pane update fine for me.  However, the directory icons on the tree don't update until I close/open explorer--is that a Windows problem or should it be put into the bug database?

It is apparently an Explorer bug, and I think it is already in the RFE tracker.

Wouldn't it be nice if TortoiseCVS could update the window (= F5)
after an Update, Commit etc? Possible? Old question?

TortoiseCVS already does this:

void TortoiseAct::RefreshExplorerWindow()
{
  PostMessage(myRemoteHandle, WM_COMMAND, 41504, 0);
}

http://www.eggheadcafe.com/forumarchives/VisualBasicwinapi/Jul2005/post23415399.asp
7/21/2005 2:21:23 PM    SendMessage API

Dear All  
  
Can anyone please help me on the following:  
  
I like to write a VB program that instructs internet explorer to refresh its  
  
window(like pressing F5 or pressing refresh button).  
  
Problem is that internet explorer should not be the active window(not having  
  
focus) so its just running in background as an icon.  
  
Therefore VB's Sendkeys-Statement can't be used and I assume I need to use  
  
Sendmessage API instead.  
  
Although I haven't done much investigations yet I don't think that it should  
  
be a problem getting IE's window handle because the I know the  
  
caption(window title) of it.  
  
However, I don't know what WM_xxx message I need to send to get a  
  
refresh(retransmitting the actual website of IE)?  
  
Would also be nice if one of you also have a piece of code how to use  
  
Sendmessage or a link to a good example.  
  
Regards  
  
Peter

7/21/2005 5:12:31 PM    Re: SendMessage API

<->  
  
1. Get the IE handle using FindWindow("ieframe", vbNullString)  
  
2. Use 'Call SendMessage(hIE, WM_COMMAND, ByVal 41504&, ByVal 0&)'  
  
WM_COMMAND = &H111, and 41504 is the menue identifier of the view-refresh  
  
submenu. May be, it differs between the IE versions, but I don' believe it.  
  
If so, you can get the right one using Spy++.  
  
Juergen.

7/22/2005 10:57:25 AM    Re: SendMessage API

Many Thanks!!!!  
  
I will test it....  
  
Peter  
  
"Juergen Thuemmler" <[e-mail]> wrote in message  
  
news:[e-mail]...  
  
it.

7/25/2005 9:07:27 AM    Re: SendMessage API

Hi Juergen  
  
Thanks again!!! This works!  
  
Another question: Where can I get the various parameter values(like 41504&)  
  
and their meanings to invoke several other functions of IE?  
  
Regards  
  
Peter  
  
"Juergen Thuemmler" <[e-mail]> wrote in message  
  
news:[e-mail]...  
  
it.

7/25/2005 10:11:16 AM    Re: SendMessage API

"Peter" <[e-mail]> wrote in message  
  
news:1121948485.276417@stern...  
  
That is the API solution. There is also a COM solution and that is what I  
  
would use. If you were to ask in the VB COM newsgroup or an IE programmer's  
  
newsgroup you would get the alternative solution.

7/25/2005 10:24:58 AM    Re: SendMessage API

You need a tool like Spy++ (shipped with Visual Studio), select "Spy" ->  
  
"Messages" in its menu bar, drag the Finder Tool to the IE main windows  
  
title bar, select the message "WM_COMMAND" only from the message list, and  
  
then operate anything in IE, e.g. menu click. You'll see the generated  
  
messages in the capturing window and have to interpret them (needs a little  
  
knowledge how Windows is working and the meaning of the message  
  
parameters...).  
  
Juergen.

7/25/2005 11:04:44 AM    Re: SendMessage API

Thanks, I aready played around with Spy++.  
  
Thought that there is also some documentation available instead of spying.  
  
Regards  
  
Peter  
  
"Juergen Thuemmler" <[e-mail]> wrote in message  
  
news:[e-mail]...  
  
little