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在我的 Windows 7 PC 上，命令行输入“pdftotext myfile.pdf”会在与 myfile.pdf 相同的目录中创建一个 .txt 文件。但是，当我在具有相同 myfile.pdf 的 ubuntu-12.04 服务器上尝试相同的命令行输入时，我得到如下错误输出：

Error: May not be a PDF file (continuing anyway)
Error (2): Illegal character <21> in hex string
Error (4): Illegal character <4f> in hex string
Error (6): Illegal character <54> in hex string
Error (7): Illegal character <59> in hex string
Error (8): Illegal character <50> in hex string
Error (11): Illegal character <48> in hex string
Error (12): Illegal character <54> in hex string
Error (13): Illegal character <4d> in hex string
Error (14): Illegal character <4c> in hex string
Error (16): Illegal character <50> in hex string
Error (17): Illegal character <55> in hex string
Error (19): Illegal character <4c> in hex string
Error (20): Illegal character <49> in hex string
Error (23): Illegal character <22> in hex string
Error (24): Illegal character <2d> in hex string
Error (25): Illegal character <2f> in hex string
Error (26): Illegal character <2f> in hex string
Error (27): Illegal character <57> in hex string
Error (30): Illegal character <2f> in hex string
Error (31): Illegal character <2f> in hex string
Error (33): Illegal character <54> in hex string
Error (36): Illegal character <48> in hex string
Error (37): Illegal character <54> in hex string
Error (38): Illegal character <4d> in hex string

等等...

Error (122): Illegal character <6c> in hex string
Error: PDF file is damaged - attempting to reconstruct xref table...
Error: Couldn't find trailer dictionary
Error: Couldn't read xref table

Windows 7 pdf 实用程序包是否与 Linux（来自 Poppler）上可用的不同？否则，相同的调用应该产生相同的结果，不是吗？

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这是因为您尝试作为输入的文件不是 PDF 文件。

它以（空格是未知字符）开头

 ! O TYP  HTML PU LI  "-//W  // T  HTM

...可以很快（？）被解释为...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML

所以它很可能是下载 PDF 时出现的错误页面。无论哪种情况，它都是 HTML 文件，而不是 PDF。

于 2013-01-27T00:07:31.993 回答