public static extern int TessPageIteratorBoundingBox( PageIterator handle, PageIteratorLevel level, out int left, out int top, out int right, out int bottom);
public static extern PolyBlockType TessPageIteratorBlockType(PageIterator handle);
public static extern void TessPageIteratorOrientation( PageIterator handle, out Orientation orientation, out WritingDirection writingDirection, out TextLineOrder textLineOrder, out float deskewAngle);
public static extern bool TessPageIteratorIsAtFinalElement( PageIterator handle, PageIteratorLevel level, PageIteratorLevel element);
public static extern bool TessPageIteratorIsAtBeginningOf(PageIterator handle, PageIteratorLevel level);
public static extern bool TessPageIteratorNext(PageIterator handle, PageIteratorLevel level);
public static extern void TessPageIteratorBegin(PageIterator handle);