You can use readProcess[1], but it has some downsides:<div><br></div><div>1. Can&#39;t specify all options to CreateProcess, e.g., working directory and environment variables.</div><div>2. Relies on lazy I/O</div><div><br></div><div>I use Data.Conduit.Process[2] for this kind of thing, which has a full tutorial[3]. However, it *does* involve non-base dependencies.<br><br><div>[1] <a href="http://www.stackage.org/haddock/2014-12-10-ghc78-exc/process-1.2.0.0/System-Process.html#v:readProcess">http://www.stackage.org/haddock/2014-12-10-ghc78-exc/process-1.2.0.0/System-Process.html#v:readProcess</a></div></div><div>[2] <a href="http://www.stackage.org/haddock/2014-12-10-ghc78-exc/conduit-extra-1.1.4.2/Data-Conduit-Process.html">http://www.stackage.org/haddock/2014-12-10-ghc78-exc/conduit-extra-1.1.4.2/Data-Conduit-Process.html</a></div><div>[3] <a href="https://www.fpcomplete.com/user/snoyberg/library-documentation/data-conduit-process?show=tutorials">https://www.fpcomplete.com/user/snoyberg/library-documentation/data-conduit-process?show=tutorials</a></div><br><div class="gmail_quote">On Thu Dec 11 2014 at 11:11:12 AM Ernesto Rodriguez &lt;<a href="mailto:neto@netowork.me">neto@netowork.me</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Dear All,<br><br></div>I have a program which invokes an external program via exec. I wish to capture the standard output of the program without using external (temporary) files. Is it possible to create an in memory handle which I can tell exec to use as standard output of the invoked program. It would be great if it can be done without any extra dependencies.<br><br></div>Best,<br clear="all"><div><div><div><br>-- <br><div><div dir="ltr"><div>Ernesto Rodriguez<br></div><div><br></div><div>Masters Student</div><div>Computer Science</div><div>Utrecht University</div><div><br></div><div><a href="http://www.netowork.me" target="_blank">www.netowork.me</a></div><div><a href="http://github.com/netogallo" target="_blank">github.com/netogallo</a></div><div><br></div><div><br></div></div></div>
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