by Michael S. Kaplan, published on 2006/05/21 15:41 -04:00, original URI: http://blogs.msdn.com/b/michkap/archive/2006/05/21/603374.aspx
For pretty much its entire natural life, Regional and Language Options has passed a WM_SETTINGCHANGE message with an LPARAM value pointing to the string "intl" -- though in earlier versions, it passed WM_WININICHANGE, but astute header file readers who look at winuser.h will note the following definitions:
#define WM_WININICHANGE 0x001A
#if(WINVER >= 0x0400)
#define WM_SETTINGCHANGE WM_WININICHANGE
#endif /* WINVER >= 0x0400 */
People will very naturally ask questions at this point when settings are changed, such as they are when SetLocaleInfo (which still stinks!) is called:
Time displayed in the Task bar is not updated when LOCALE_STIMEFORMAT is updated via SetLocaleInfo.
Even though we're trying to discourage people from calling SetLocaleInfo, it still is a public API, and a user could change the time format in this manner. Not having the time updated seems like something we should fix.
Ah, but if you read the documentation for the WM_SETTINGCHANGE message is explains who is not doing the right thing here:
Applications should send WM_SETTINGCHANGE to all top-level windows when they make changes to system parameters. (This message cannot be sent directly to a window.) To send the WM_SETTINGCHANGE message to all top-level windows, use the SendMessageTimeout function with the hwnd parameter set to HWND_BROADCAST.
So, it is the job of the application that is calling the stinky SetLocaleInfo to let the other applications know that an "intl" change has been made....
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