This prints a representation of a page preview called sheet, which is an NSBox

- (void)sendToPrinter:(int)code {
    NSPrintInfo *printInfo;
    NSPrintInfo *sharedInfo;
    NSPrintOperation *printOp;
    NSMutableDictionary *printInfoDict;
    NSMutableDictionary *sharedDict;

     sharedInfo = [NSPrintInfo sharedPrintInfo];
     sharedDict = [sharedInfo dictionary];
     printInfoDict = [NSMutableDictionary dictionaryWithDictionary:
                     sharedDict];
    [printInfoDict setObject:NSPrintSpoolJob 
                      forKey:NSPrintJobDisposition];
     printInfo = [[NSPrintInfo alloc] initWithDictionary: printInfoDict];
    [printInfo setHorizontalPagination: NSAutoPagination];
    [printInfo setVerticalPagination: NSAutoPagination];
    [printInfo setVerticallyCentered:NO];
    [printInfo setLeftMargin:10];
    [printInfo setRightMargin:10];
    [printInfo setTopMargin:10];
    [printInfo setBottomMargin:10];
    [printInfo setScalingFactor:1.1];
     printOp = [NSPrintOperation printOperationWithView:sheet 
                                             printInfo:printInfo];
    [printOp setShowsPrintPanel:YES];
    [printOp runOperation];
}

- (BOOL)knowsPageRange:(NSRangePointer)aRange;
{ 
    *aRange = NSMakeRange(1, 10);
    return YES;
}

- (void)beginPageInRect:(NSRect)aRect atPlacement:(NSPoint)location;
{
    [self setTitle:[NSString stringWithFormat:@"Page %d", [[NSPrintOperation currentOperation] currentPage]]];
    [super beginPageInRect:aRect atPlacement:location];
}

- (NSRect)rectForPage:(NSInteger)page;
{
    return [self bounds];
}

@end