php - 从 PHP : Unable to open the initial device 调用 Ghostscript

Question

我已经从 MacPorts 安装了 Ghostscript，并尝试从 PHP 脚本调用它以从多页 PDF 文件中提取单页，然后将其输出。我的代码如下所示:

<?php

$cmd = '/opt/local/bin/gs -sDEVICE=pdfwrite -dNOPAUSE \
    -dBATCH -dSAFER -dFirstPage=20 -dLastPage=20
    -sOutputFile=%stdout  "/path/to/input/pdf.pdf"';

// Will uncomment this when it works
// header("Content-Type: application/pdf");

putenv("GS_LIB=/opt/local/share/ghostscript/9.02/lib");
putenv("GS_FONTPATH=/opt/local/share/ghostscript/fonts");
putenv("TMPDIR=/tmp");

passthru($cmd);

当我在网络浏览器中点击这个脚本时，我看到:

GPL Ghostscript 9.02 (2011-03-30) Copyright (C) 2010 Artifex Software, Inc.
All rights reserved. This software comes with NO WARRANTY: see the file
PUBLIC for details. **** Unable to open the initial device, quitting.

相同的命令在 shell 中起作用。

Answer 1

apache/webserver 用户可能没有权限或相同的环境变量。也许尝试 sudo，或确保 apache 具有适当的权限。