TBM_SETRANGE Overview Group

The TBM_SETRANGE message sets the range of minimum and maximum logical positions for the slider in a trackbar.

TBM_SETRANGE 

wParam = (WPARAM) (BOOL) fRedraw; 

lParam = (LPARAM) MAKELONG(lMinimum, lMaximum);

Parameters

fRedraw: Redraw flag. If this parameter is TRUE, the trackbar is redrawn after the range is set. If this parameter if FALSE, the message sets the range but does not redraw the trackbar.
lMinimum: Minimum position for the slider.
lMaximum: Maximum position for the slider.

No return value.

If the current slider position is outside the new range, the TBM_SETRANGE message sets the slider position to the new maximum or minimum value.