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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>13 Input and Output</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="extras.css" title="default"/><link rel="stylesheet" type="text/css" href="icons.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" 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href="notation.html" class="tocviewlink" data-pltdoc="x">Notation for Documentation</a></td></tr><tr><td align="right">3 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntactic Forms</a></td></tr><tr><td align="right">4 </td><td><a href="data.html" class="tocviewlink" data-pltdoc="x">Datatypes</a></td></tr><tr><td align="right">5 </td><td><a href="structures.html" class="tocviewlink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">6 </td><td><a href="mzlib_class.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">7 </td><td><a href="mzlib_unit.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">8 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">9 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Control Flow</a></td></tr><tr><td align="right">11 </td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr><tr><td align="right">12 </td><td><a href="Macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">13 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">14 </td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Reflection and Security</a></td></tr><tr><td align="right">15 </td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr><tr><td align="right">16 </td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x">Memory Management</a></td></tr><tr><td align="right">17 </td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Operations</a></td></tr><tr><td align="right">18 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>13 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Input and Output</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">13.1 </td><td><a href="ports.html" class="tocviewlink" data-pltdoc="x">Ports</a></td></tr><tr><td align="right">13.2 </td><td><a href="Byte_and_String_Input.html" class="tocviewlink" data-pltdoc="x">Byte and String Input</a></td></tr><tr><td align="right">13.3 </td><td><a href="Byte_and_String_Output.html" class="tocviewlink" data-pltdoc="x">Byte and String Output</a></td></tr><tr><td align="right">13.4 </td><td><a href="Reading.html" class="tocviewlink" data-pltdoc="x">Reading</a></td></tr><tr><td align="right">13.5 </td><td><a href="Writing.html" class="tocviewlink" data-pltdoc="x">Writing</a></td></tr><tr><td align="right">13.6 </td><td><a href="pretty-print.html" class="tocviewlink" data-pltdoc="x">Pretty Printing</a></td></tr><tr><td align="right">13.7 </td><td><a href="Reader_Extension.html" class="tocviewlink" data-pltdoc="x">Reader Extension</a></td></tr><tr><td align="right">13.8 </td><td><a href="Printer_Extension.html" class="tocviewlink" data-pltdoc="x">Printer Extension</a></td></tr><tr><td align="right">13.9 </td><td><a href="serialization.html" class="tocviewlink" data-pltdoc="x">Serialization</a></td></tr><tr><td align="right">13.10 </td><td><a href="fasl.html" class="tocviewlink" data-pltdoc="x">Fast-<wbr></wbr>Load Serialization</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.3", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.3");">top</a></span><span class="navright"> <a href="syntax-util.html" title="backward to "12.11 Syntax Utilities"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "The Racket Reference"" data-pltdoc="x">up</a> <a href="ports.html" title="forward to "13.1 Ports"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-source-pkg="racket-doc" x-part-tag=""input-and-output"">13<tt> </tt><a name="(part._input-and-output)"></a>Input and Output</h3><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p><span class="imageleft"><img src="finger.png" alt="+" width="24" height="24"/></span><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=guide&rel=i_o.html&version=6.3" class="Sq" data-pltdoc="x">Input and Output</a> in <a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=guide&rel=index.html&version=6.3" class="Sq" data-pltdoc="x"><span style="font-weight: bold">The Racket Guide</span></a> introduces Ports and I/O.</p></blockquote></blockquote></blockquote><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="ports.html" class="toclink" data-pltdoc="x">13.1<span class="hspace"> </span>Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="encodings.html" class="toclink" data-pltdoc="x">13.1.1<span class="hspace"> </span>Encodings and Locales</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-ops.html" class="toclink" data-pltdoc="x">13.1.2<span class="hspace"> </span>Managing Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-buffers.html" class="toclink" data-pltdoc="x">13.1.3<span class="hspace"> </span>Port Buffers and Positions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="linecol.html" class="toclink" data-pltdoc="x">13.1.4<span class="hspace"> </span>Counting Positions, Lines, and Columns</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="file-ports.html" class="toclink" data-pltdoc="x">13.1.5<span class="hspace"> </span>File Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="stringport.html" class="toclink" data-pltdoc="x">13.1.6<span class="hspace"> </span>String Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pipeports.html" class="toclink" data-pltdoc="x">13.1.7<span class="hspace"> </span>Pipes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="portstructs.html" class="toclink" data-pltdoc="x">13.1.8<span class="hspace"> </span>Structures as Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="customport.html" class="toclink" data-pltdoc="x">13.1.9<span class="hspace"> </span>Custom Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-lib.html" class="toclink" data-pltdoc="x">13.1.10<span class="hspace"> </span>More Port Constructors, Procedures, and Events</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-lib.html#%28part._.Port_.String_and_.List_.Conversions%29" class="toclink" data-pltdoc="x">13.1.10.1<span class="hspace"> </span>Port String and List Conversions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-lib.html#%28part._.Creating_.Ports%29" class="toclink" data-pltdoc="x">13.1.10.2<span class="hspace"> </span>Creating Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-lib.html#%28part._.Port_.Events%29" class="toclink" data-pltdoc="x">13.1.10.3<span class="hspace"> </span>Port Events</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="port-lib.html#%28part._.Copying_.Streams%29" class="toclink" data-pltdoc="x">13.1.10.4<span class="hspace"> </span>Copying Streams</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Byte_and_String_Input.html" class="toclink" data-pltdoc="x">13.2<span class="hspace"> </span>Byte and String Input</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Byte_and_String_Output.html" class="toclink" data-pltdoc="x">13.3<span class="hspace"> </span>Byte and String Output</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Reading.html" class="toclink" data-pltdoc="x">13.4<span class="hspace"> </span>Reading</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Writing.html" class="toclink" data-pltdoc="x">13.5<span class="hspace"> </span>Writing</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html" class="toclink" data-pltdoc="x">13.6<span class="hspace"> </span>Pretty Printing</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html#%28part._.Basic_.Pretty-.Print_.Options%29" class="toclink" data-pltdoc="x">13.6.1<span class="hspace"> </span>Basic Pretty-Print Options</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html#%28part._.Per-.Symbol_.Special_.Printing%29" class="toclink" data-pltdoc="x">13.6.2<span class="hspace"> </span>Per-Symbol Special Printing</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html#%28part._.Line-.Output_.Hook%29" class="toclink" data-pltdoc="x">13.6.3<span class="hspace"> </span>Line-Output Hook</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html#%28part._.Value_.Output_.Hook%29" class="toclink" data-pltdoc="x">13.6.4<span class="hspace"> </span>Value Output Hook</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pretty-print.html#%28part._.Additional_.Custom-.Output_.Support%29" class="toclink" data-pltdoc="x">13.6.5<span class="hspace"> </span>Additional Custom-Output Support</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Reader_Extension.html" class="toclink" data-pltdoc="x">13.7<span class="hspace"> </span>Reader Extension</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="readtables.html" class="toclink" data-pltdoc="x">13.7.1<span class="hspace"> </span>Readtables</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="reader-procs.html" class="toclink" data-pltdoc="x">13.7.2<span class="hspace"> </span>Reader-Extension Procedures</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="special-comments.html" class="toclink" data-pltdoc="x">13.7.3<span class="hspace"> </span>Special Comments</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Printer_Extension.html" class="toclink" data-pltdoc="x">13.8<span class="hspace"> </span>Printer Extension</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="serialization.html" class="toclink" data-pltdoc="x">13.9<span class="hspace"> </span>Serialization</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="fasl.html" class="toclink" data-pltdoc="x">13.10<span class="hspace"> </span>Fast-Load Serialization</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a 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