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Editorial Team
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Asked: 2026-05-27T08:40:11+00:00

With my external program I create a PDF file, and try to pass to

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With my external program I create a PDF file, and try to pass to an erlang program. But the PDF contains EOT symbols. When the first EOT is reached, the transfer stops.

How I can pass the whole file?

added after sarnold,

os:cmd(io_lib:format("LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib; 
  export LD_LIBRARY_PATH; /home/yola/progra/cpp/pdf/a.out ~s", ["Hello"]))

this doesnt return whole generated file. First EOT symbol encountered at 2305 pos and erlang got 2304 symbols, but file length 64xxx bytes.

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1 Answer

  1. Editorial Team

    The os:cmd function uses EOT to know when to stop reading from the external program; see os.erl. So you’ll have to do it in some other way, such as redirecting output to a file:

    os:cmd(io_lib:format("LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib; 
  export LD_LIBRARY_PATH; /home/yola/progra/cpp/pdf/a.out ~s > my.pdf", ["Hello"])),
{ok, MyPDF} = file:read_file("my.pdf")
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