How can I set PrintDialog's options in background.

Hi everybody.

I want to print something with Printer of "Microsoft Print to PDF" and file name of "myfile.pdf".  But I do not want to show any dialog box.

/* This is a code displaying PrintDialog and SaveDialog */

if ( PrintDialog->Execute() ) {

    Printer->BeginDoc();

    // some code

    Printer->EndDoc();

}

Is there anybody knows how to do this?

Thanks.