TOPIC:

PDFAnnot *annotation = [currentPage annotAtIndex:0]; // We are having annotation here
PDF_RECT rect;
rect.left = 0.f;
rect.right = 0.f;
rect.top = 0.f;
rect.bottom = 0.f;
[annotation getRect:&rect];

-(void)getRect:(PDF_RECT *)rect
{
Page_getAnnotRect( m_page, m_handle, rect );
}