XP中更改文件关联后如何刷新图标? [英] how to refresh icon after change file association in XP?

问题描述

大家好
我试图在XP中更改.htm文件的文件关联，这是我的操作方法:

1.更改关联的注册表项值.

2.调用SHChangeNotify(SHCNE_ASSOCCHANGED，SHCNF_IDLIST，0，0)刷新图标；

完成这些操作后，我双击.htm文件，然后由预期的浏览器将其打开.但是桌面上的图标不会更改为新图标(例如，从IE到Chrome).但是，如果重新启动explorer.exe，图标将更改为正确的图标.

谁能告诉我更改文件关联后如何刷新桌面上的图标?

感谢您的任何答复.

Hi all
I tried to change file association of .htm file in XP, and here is how I did it:

1. Change the associated registry key values.

2. Call SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0) to refresh the icon;

After doing these, I double clicking the .htm file, and it is opened by the browser I expected. But the icon on the desktop is not changed into the new one(e.g. from IE to Chrome). However, if I restart explorer.exe, the icon changed to the correct one.

Can anyone please tell me how to refresh the icon on desktop after changing the file association ?

Any replies from you will be appreciated, thanks.

推荐答案

您可以使用WINAPI函数SendMessageTimeout，该函数接收消息与当前线程属于同一队列，即窗口该过程将直接调用-超时值将被忽略.以下代码将帮助您

You can use SendMessageTimeout WINAPI function, which receives the message belongs to the same queue as the current thread, the window procedure is called directly—the time-out value is ignored. The below code will help

DWORD result2 = 0; 
LRESULT result = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,(LPARAM)_T("Environment"), SMTO_ABORTIFHUNG, 5000, &result2);

我从网上找到了两种解决方案:
1.在注册表中更改图标大小，然后将其更改回，并使用
发送消息 SendMessage(HWND_BROADCAST，WM_WININICHANGE，0,0);
上面解决方案的副作用是，即使未启用自动排列，它也会重新排列桌面上的图标布局.

2.SHChangeNotify(SHCNE_ASSOCCHANGED，SHCNF_IDLIST，0，0);
这样就可以完成工作，并且完全没有副作用.

There are two solutions I found from web:
1.change the icon size in the registry then change it back, and sendmessage with
SendMessage(HWND_BROADCAST,WM_WININICHANGE,0,0);
The side effect of solution above is that it will re-arrange the icon layout on the desktop even the auto-arrange is not enabled.

2.SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0);
This can do the job and have no side effect at all.

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