0x0118消息就是WM_SYSTIMER

編輯框出現(xiàn)輸入光標(biāo)時(shí),產(chǎn)生的消息.

0x0118 would be the undocumented WM_SYSTIMER, which appears to be used for caret blinks.

0x0118是一個(gè)undocument?消息，?微軟沒(méi)有記錄。
但在一些庫(kù)的源碼中可以看到，比如ATL的庫(kù)文件atlapp.h中，如此寫到：

static?BOOL?IsIdleMessage(MSG*?pMsg)
{
//?These?messages?should?NOT?cause?idle?processing
switch(pMsg->message)
{
case?WM_MOUSEMOVE:
#ifndef?_WIN32_WCE
case?WM_NCMOUSEMOVE:
#endif?//!_WIN32_WCE
case?WM_PAINT:
case?0x0118: //?WM_SYSTIMER?(caret?blink)
return?FALSE;
}return?TRUE;
}

由此可知0x0118是WM_SYSTIMER?消息

INFO: Windows WM_SYSTIMER Message Is an Undocumented Message
Q108938
The information in this article applies to:
Microsoft Win32 Software Development Kit (SDK)
Microsoft Windows Software Development Kit (SDK) 3.1

SUMMARY
The WM_SYSTIMER message in Windows is an undocumented system message; it should not be trapped or relied on by an application. This message can occasionally be viewed in Spy or in CodeView while debugging. Windows uses the WM_SYSTIMER message internally to control the scroll rate of highlighted text (text selected by the user) in edit controls, or highlighted items in list boxes.
NOTE: The WM_SYSTIMER message is for Windows's internal use only and can be changed without prior notice.