PSN_APPLY


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PSN_APPLY
PSN_APPLY 
    lppsn = (LPPSHNOTIFY) lParam; 
Indicates that the user clicked the OK or Apply Now button and wants all changes to take effect. This notification message is sent in the form of a WM_NOTIFY message.
Returns the PSNRET_INVALID_NOCHANGEPAGE value to prevent the changes from taking effect and to return the focus to the page, or the PSNRET_NOERROR value to accept the changes and allow the property sheet to be destroyed.

lppsn
Address of a PSHNOTIFY structure that contains information about the notification. The lParam member of this structure does not contain any information. The hwndFrom member of the hdr member of this structure contains the handle to the property sheet.

To set the return value, the dialog box procedure for the page must use the SetWindowLong function with the DWL_MSGRESULT value, and the dialog box procedure must return TRUE.
A page should not call the EndDialog function when processing this notification message.
The property sheet is destroyed if the user clicks the OK button and the application returns the PSNRET_NOERROR value in response to this notification.
To receive this notification, a page must set the DWL_MSGRESULT value to FALSE in response the PSN_KILLACTIVE notification message.
The PSHNOTIFY structure is supplied with the PSN_APPLY notification message. The lParam member in this structure is TRUE if the user clicked the OK or Cancel button and is FALSE if the user clicked the Close button.

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