WM_COMPACTING message
Sent to all top-level windows when the system detects more than 12.5 percent of system time over a 30- to 60-second interval is being spent compacting memory. This indicates that system memory is low.
A window receives this message through its WindowProc function.
Note
This message is provided only for compatibility with 16-bit Windows-based applications.
#define WM_COMPACTING 0x0041
Parameters
-
wParam
-
The ratio of central processing unit (CPU) time currently spent by the system compacting memory to CPU time currently spent by the system performing other operations. For example, 0x8000 represents 50 percent of CPU time spent compacting memory.
-
lParam
-
This parameter is not used.
Return value
Type: LRESULT
If an application processes this message, it should return zero.
Remarks
When an application receives this message, it should free as much memory as possible, taking into account the current level of activity of the application and the total number of applications running on the system.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|
See also