PHP_PRINTER.DLL : how to use printer_create_dc?

According to the sample at http://www.php.net/manual/en/function.printer-create-dc.php <?php $handle = printer_open(); printer_start_doc($handle); printer_start_page($handle); printer_create_dc($handle); /* do some stuff with the dc */ printer_set_option($handle, PRINTER_TEXT_COLOR, "333333"); printer_draw_text($handle, 1, 1, "text"); printer_delete_dc($handle); /* create another dc */ printer_create_dc($handle); printer_set_option($handle, PRINTER_TEXT_COLOR, "000000"); printer_draw_text($handle, 1, 1, "text"); /* do some stuff with the dc */ printer_delete_dc($handle); printer_end_page($handle); printer_end_doc($handle); printer_close($handle); ?> PHP throw me this: PHP Warning: printer_create_dc(): Deleting old DeviceContext in C:\WinBinder\phpcode\examples\print_dc.php on line 6 PHP Warning: printer_end_page(): couldn't end the page in C:\WinBinder\phpcode\examples\print_dc.php on line 20 PHP Warning: printer_end_doc(): couldn't terminate print job in C:\WinBinder\phpcode\examples\print_dc.php on line 21 I figure out already that printer_open() create a new DC till it's deleted or another is created. But that means it only can exist one document in each dc because it cannot be printed if the dc is deleted... I want to use PRINTER_TEXT_ALIGN but it seems it doesn't work... I download the php_printer.dll from http://pecl4win.php.net/ext.php/php_printer.dll and found the source code printer.c at http://viewcvs.php.net/viewvc.cgi/pecl/printer/printer.c?revision=1.34&view=markup