please dont rip this site Prev Next

OpenWaitableTimer info  Overview  Group

The OpenWaitableTimer function returns a handle to an existing named “waitable” timer object.

HANDLE OpenWaitableTimer(

    DWORD dwDesiredAccess,

// access flag

    BOOL bInheritHandle,

// inherit flag

    LPCTSTR lpTimerName

// pointer to timer object name




Specifies the requested access to the timer object. For systems that support object security, the function fails if the security descriptor of the specified object does not permit the requested access for the calling process.

This parameter can be any combination of the following values:




Specifies all possible access rights for the timer object.


Enables use of the timer handle in the SetWaitableTimer and CancelWaitableTimer functions to modify the timer’s state.


Enables use of the timer handle in any of the wait functions to wait for the timer’s state to be signaled.

Specifies whether the returned handle is inheritable. If TRUE, a process created by the CreateProcess function can inherit the handle; otherwise, the handle cannot be inherited.
Points to a null-terminated string specifying the name of the timer object. The name is limited to MAX_PATH characters and can contain any character except the backslash path-separator character (\). Name comparison is case sensitive.

Return Value

If the function succeeds, the return value is a handle to the timer object.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.


The OpenWaitableTimer function enables multiple processes to open handles to the same timer object. The function succeeds only if some process has already created the timer using the CreateWaitableTimer function. The calling process can use the returned handle in any function that requires the handle of a timer object, such as the wait functions, subject to the limitations of the access specified in the dwDesiredAccess parameter.

The returned handle can be duplicated by using the DuplicateHandle function. Use the CloseHandle function to close the handle. The system closes the handle automatically when the process terminates. The timer object is destroyed when its last handle has been closed.

See Also

CancelWaitableTimer, CloseHandle, CreateProcess, CreateWaitableTimer, DuplicateHandle, SetWaitableTimer

file: /Techref/os/win/api/win32/func/src/f66_12.htm, 4KB, , updated: 2000/4/7 12:19, local time: 2024/7/20 09:14,

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> OpenWaitableTimer</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2024 contributors:
o List host: MIT, Site host, Top posters @none found
- Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.

Welcome to!