please dont rip this site Prev Next

WM_POWER Overview  Group

The WM_POWER message is sent when the system, typically a battery-powered personal computer, is about to enter suspended mode.

The WM_POWER message is obsolete. It is provided to simplify porting of 16-bit Windows-based applications. New Win32-based applications should use the WM_POWERBROADCAST message.

WM_POWER 

fwPowerEvt = wParam;    // power-event notification message 

 

Parameters

fwPowerEvt
Value of wParam. Specifies a power-event notification message. This parameter can be one of the following values:

Value

Meaning

PWR_CRITICALRESUME

Indicates that the system is resuming operation after entering suspended mode without first sending a PWR_SUSPENDREQUEST notification message to the application. An application should perform any necessary recovery actions.

PWR_SUSPENDREQUEST

Indicates that the system is about to enter suspended mode.

PWR_SUSPENDRESUME

Indicates that the system is resuming operation after having entered suspended mode normally ¾ that is, the system sent a PWR_SUSPENDREQUEST notification message to the application before the system was suspended. An application should perform any necessary recovery actions.

Return Values

The value an application returns depends on the value of the wParam parameter. If wParam is PWR_SUSPENDREQUEST, the return value is PWR_FAIL to prevent the system from entering the suspended state; otherwise, it is PWR_OK. If wParam is PWR_SUSPENDRESUME or PWR_CRITICALRESUME, the return value is zero.

Remarks

This message is sent only to an application that is running on a system that conforms to the Advanced Power Management (APM) basic input/output system (BIOS) specification. The message is sent by the power-management driver to each window returned by the EnumWindows function.

The suspended mode is the state in which the greatest amount of power savings occurs, but all operational data and parameters are preserved. Random-access memory (RAM) contents are preserved, but many devices are likely to be turned off.

See Also

EnumWindows, WM_POWERBROADCAST


file: /Techref/os/win/api/win32/mess/src/msg26_28.htm, 3KB, , updated: 2000/4/7 12:20, local time: 2022/5/27 04:28,
TOP NEW HELP FIND: 
100.24.115.215:LOG IN

 ©2022 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="http://www.piclist.com/techref/os/win/api/win32/mess/src/msg26_28.htm"> WM_POWER</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 2022 contributors:
o List host: MIT, Site host massmind.org, Top posters @20220527
* 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 www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .