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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WM_POWER
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The WM_POWER message is obsolete.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  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
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