WM_CAP_SET_PREVIEW
The
WM_CAP_SET_PREVIEW message enables or disables preview mode. In preview mode,
frames are transferred from the capture hardware to system memory and then
displayed in the capture window using GDI functions. You can send this message
explicitly or by using the capPreview macro.
WM_CAP_SET_PREVIEW
wParam = (WPARAM) (BOOL) (f);
lParam = 0L;
Parameters
f
Preview flag.
Specify TRUE for this parameter to enable preview mode or FALSE to disable it.
Return Values
Returns TRUE
if successful or FALSE otherwise.
Remarks
The preview mode
uses substantial CPU resources. Applications can disable preview or lower the
preview rate when another application has the focus. The fLiveWindow
member of the CAPSTATUS
structure indicates if preview mode is currently enabled.
Enabling
preview mode automatically disables overlay mode.
See Also