python – 如何为Xerox打印机创建动态作业单？

我遇到了同样的问题.最后,我发现由于对 PDF格式的误解导致我的方式错误.我们认为PDF文件是打印机的WYSIWYG.不是这种情况.在任何类型的打印流程中,PDF文件通常会转换为某种中间格式,PostScript,TIFF图像或 PCL.

这可能发生在您的本地计算机上,这就是您需要驱动程序或打印机本身的原因.如果它在打印机上发生,您只需将PDF文件传输到另一台计算机并设置适当的转换系统.

这一切都很好,但是PDF没有定义页面顺序,这对于打印就绪格式非常违反直觉.这意味着您的文档没有第一页,您将无法以任何形式或形式本地定义它.

你有两个解决方案：

>选择打印机架构并使用其设置媒体类型的独特方法,这是一种痛苦,不可移植.
>转换为允许设置媒体类型的格式,并包括页面排序的概念,例如PostScript.然后添加媒体命令并将此文件一起发送到您的打印机.如果您的打印机具有用于读取所选中间格式的驱动程序,则应将命令转换为其媒体切换版本.这更便携但仍然不完美.

这类似于将C程序转换为程序集以将其移植到新架构的想法.它主要起作用,但你必须把每个系统都搞砸了.

假设的管道将是：

Create your PDF file > run it through a PDF-to-PostScript conversion utility or library > run through a custom lexer to add media type commands at each new page > send to PostScript file to printer

这是一项很多工作,但这是你要找到的唯一可以解决问题的方法.

样品

%{
char paper[] = 'yourPaper';
%}
%option 8bit outfile="scanner.c"
%option nounput nomain noyywrap
%option warn

%%
showpage { printf("showpagensetpagedevice MediaType '%s'",paper); }
%%
int main(int argc,char **argv);

int main (argc,argv)
int argc;
char **argv;
{
    yylex();
    return 0;
}

以上是一个非常简单的词法分析器,用于查找从stdin获取的每个showpage命令并输出showpage setpagedevice命令集. setpagedevice MediaType命令是与打印机无关的设置用于页面的纸张类型的方法.

要使用flex和GCC编译代码：

flex -Cf scanner.l
gcc -O -o lineCount.exe scanner.c

它通过stdin接受输入并输出到stdout.

下面列出了更完整的词法分析器.它使用GNU getopts作为命令行选项,并有两个规则,因此它也将为第一页设置页面设??备.它可能无法完美地抓取页面,并且它只有一个用于纸张类型的变量,因此功能有限.另一方面,它非常开放,但是您希望它确定要使用的页面设备.

要么识别它正在查看的页面类型的新规则,要么是每页有一行的附加输入文件,这两个立即浮现在脑海中.

/*
 * This file is part of flex.
 *
 * Redistribution and use in source and binary forms,with or without
 * modification,are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice,this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice,this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * Neither the name of the University nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES,INCLUDING,WITHOUT LIMITATION,THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

     /**************************************************
        Start of definitions section

    ***************************************************/

%{
/* A template scanner file to build "scanner.c". */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
/*#include "parser.h" */

//put your variables here
char FileName[256];
FILE *outfile;
char inputName[256];
char paper[] = 'yourPaper';

// flags for command line options
static int specificFile_flag = 0;
static int output_flag = 0;
static int help_flag = 0;

%}


%option 8bit outfile="scanner.c"
%option nounput nomain noyywrap
%option warn

%%
    /************************************************
        start of rules section

    *************************************************/


    /* These flex patterns will eat all input */
EndSetup { printf("showpagensetpagedevice MediaType '%s'",paper); }
showpage { printf("showpagensetpagedevice MediaType '%s'",paper); }


%%
    /****************************************************
        Start of code section


    *****************************************************/

int main(int argc,argv)
int argc;
char **argv;
{
    /****************************************************
        The main method drives the program. It gets the filename from the
        command line,and opens the initial files to write to. Then it calls the lexer.
        After the lexer returns,the main method finishes out the report file,closes all of the open files,and prints out to the command line to let the
        user know it is finished.
    ****************************************************/

    int c;

    // The GNU getopt library is used to parse the command line for flags
    // afterwards,the final option is assumed to be the input file

    while (1) {
        static struct option long_options[] = {
            /* These options set a flag. */
            {"help",no_argument,&help_flag,1},/* These options don't set a flag. We distinguish them by their indices. */

            {"useStdOut",'o'},{0,0}
        };
           /* getopt_long stores the option index here. */
        int option_index = 0;
        c = getopt_long (argc,argv,"o",long_options,&option_index);

        /* Detect the end of the options. */
        if (c == -1)
            break;

        switch (c) {
            case 0:
               /* If this option set a flag,do nothing else now. */
               if (long_options[option_index].flag != 0)
                 break;
               printf ("option %s",long_options[option_index].name);
               if (optarg)
                 printf (" with arg %s",optarg);
               printf ("n");
               break;

            case 'o':
               output_flag = 1;
               break;


            case '?':
               /* getopt_long already printed an error message. */
               break;

            default:
               abort ();
            }
    }

    if (help_flag == 1) {
        printf("proper syntax is: traySwitch.exe [OPTIONS]... INFILE OUTFILEn");
        printf("adds tray switching information to postscript filenn");
        printf("Option list: n");
        printf("-o                        sets output to stdoutn");
        printf("--help                   print help to screenn");
        printf("n");
        printf("inputfile example: traySwitch.exe test.psn");
        printf("If infile is left out,then stdin is used for input.n");
        printf("If outfile is a filename,then that file is used.n");
        printf("If there is no outfile,then infile-EDIT.ps is used.n");
        printf("There cannot be an outfile without an infile.n");
        return 0;
    }

    //Get the filename off the command line and redirect it to input
    //if there is no filename or it is a - then use stdin.


    if (optind < argc) {
        FILE *file;

        file = fopen(argv[optind],"rb");
        if (!file) {
            fprintf(stderr,"Flex could not open %sn",argv[optind]);
            exit(1);
        }
        yyin = file;
        strcpy(inputName,argv[optind]);
    }
    else {
        printf("no input file set,using stdin. Press ctrl-c to quit");
        yyin = stdin;
        strcpy(inputName,"bbbbbagainst stdin");
    }

    //Increment current place in argument list
    optind++;


    /********************************************
        If no input name,then output set to stdout.
        If no output name then copy input name and add -EDIT.csv.
        If input name is '-' then output set to stdout,otherwise use output name.

    *********************************************/
    if (optind > argc) {
        yyout = stdout;
    }
    else if (output_flag == 1) {
        yyout = stdout;
    }
    else if (optind < argc){
        outfile = fopen(argv[optind],"wb");
        if (!outfile) {
            fprintf(stderr,FileName);
            exit(1);
        }
        yyout = outfile;
    }
    else {
        strncpy(FileName,argv[optind-1],strlen(argv[optind-1])-4);
        FileName[strlen(argv[optind-1])-4] = '';
        strcat(FileName,"-EDIT.ps");
        outfile = fopen(FileName,FileName);
            exit(1);
        }
        yyout = outfile;
    }

    yylex();
    if (output_flag == 0) {
        fclose(yyout);
    }
    printf("Flex program finished running file %sn",inputName);
    return 0;
}