pdflib: unable to generate on the fly, need to write to file

I have successfully installed pdflib with PHP4.0.4pl1 and all the necessary components. However, I don't know how to output a generated pdf to the browser without writing it to disk first and then reading it in. Below are the examples that I use. This example tries to directly output the pdf to the browser and doesn't work. The browser says "An error has occured while trying to use this document." ------------ <? header( "Content-type: application/pdf" ); $pdf = PDF_open(); pdf_set_info_author($pdf, "Me"); PDF_set_info_title($pdf, "Test"); PDF_set_info_author($pdf, "Name of Author"); pdf_set_info_creator($pdf, "See Author"); pdf_set_info_subject($pdf, "Testing"); PDF_begin_page($pdf, 595, 842); PDF_add_outline($pdf, "Page 1"); pdf_set_font($pdf, "Times-Roman", 30, "winansi"); pdf_set_text_rendering($pdf, 1); PDF_show_xy($pdf, "Times Roman outlined", 50, 750); pdf_moveto($pdf, 50, 740); pdf_lineto($pdf, 330, 740); pdf_stroke($pdf); PDF_end_page($pdf); PDF_close($pdf); ?> ------------ However, the following script that writes the pdf to disk first and is then read in works fine: ------------ <? $fp = fopen("pdftesting.pdf", w); $pdf = PDF_open($fp); pdf_set_info_author($pdf, "Me"); PDF_set_info_title($pdf, "Test"); PDF_set_info_author($pdf, "Name of Author"); pdf_set_info_creator($pdf, "See Author"); pdf_set_info_subject($pdf, "Testing"); PDF_begin_page($pdf, 595, 842); PDF_add_outline($pdf, "Page 1"); pdf_set_font($pdf, "Times-Roman", 30, "winansi"); pdf_set_text_rendering($pdf, 1); PDF_show_xy($pdf, "Times Roman outlined", 50, 750); pdf_moveto($pdf, 50, 740); pdf_lineto($pdf, 330, 740); pdf_stroke($pdf); PDF_end_page($pdf); PDF_close($pdf); fclose($fp); header( "Content-type: application/pdf" ); $fp = fopen("pdftesting.pdf", "r"); fpassthru($fp); fclose($fp); ?> ------------ Any reason why I have to write the pdf to disk instead of just sending it to the browser? Am I missing an output function? Thanks. -- Dominic