Handle System Sleep-Wake Transitions Properly

[This is preliminary documentation and subject to change.]

Requirement   (Designed for Microsoft® Windows® Logo)

Applications should handle system sleep/wake transitions by monitoring WM_POWERBROADCAST messages. When applications receive sleep messages (WM_POWERBROADCAST PBT_APMSUSPEND), they must:

• Flush any unsaved user data to nonvolatile media. Applications must save this data to a temporary file or backup file since the user has not given the command to save the original file.
• Close all open files.

When applications receive wake messages (WM_POWERBROADCAST PBT_APMRESUMESUSPEND), they must:

• Reopen any files that had been open.
• Verify the user's files and inform the user if there are any problems (for example: files can no longer be found, files have been modified by someone else, and so forth).

Applications must avoid destabilizing or crashing the system as a result of sleep/wake transitions.

See Also

For a description of pretesting you can do to ensure that your application provides proper ACPI/OnNow support, see Pretesting ACPI/OnNow support.

For more information about the OnNow initiative and for OnNow technical specifications, see http://www.microsoft.com/hwdev/onnow.htm.