Sent to a WIMMessageCallback function to indicate an update in the progress of an image application.
WIM_MSG_PROGRESS wParam = (UINT) dwPercent; lParam = (UINT) dwTicksRemaining;
Parameters
wParam
[in] Specifies the percentage of the image that was already applied.
lParam
[in] Specifies the estimated number of milliseconds until the image application is complete.
Return Value
Your routine must return WIM_MSG_SUCCESS.
Remarks
Progress estimates typically increase during the early stages of an image apply and later decrease, so the calling process must handle this as appropriate.