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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Writes a slice of bytes as the new contents of a file."><title>write in async_fs - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="async_fs" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../async_fs/index.html"><img src="https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../async_fs/index.html"><img src="https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png" alt="logo"></a><h2><a href="../async_fs/index.html">async_<wbr>fs</a><span class="version">2.1.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">write</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#errors" title="Errors">Errors</a></li><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate async_<wbr>fs</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">async_fs</a></span><h1>Function <span class="fn">write</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/async_fs/lib.rs.html#707-711">Source</a> </span></div><pre class="rust item-decl"><code>pub async fn write&lt;P: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.84.0/std/path/struct.Path.html" title="struct std::path::Path">Path</a>&gt;, C: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;[<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u8.html">u8</a>]&gt;&gt;(
path: P,
contents: C,
) -&gt; <a class="type" href="https://doc.rust-lang.org/1.84.0/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.unit.html">()</a>&gt;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Writes a slice of bytes as the new contents of a file.</p>
<p>This function will create a file if it does not exist, and will entirely replace its contents
if it does.</p>
<h2 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</h2>
<p>An error will be returned in the following situations:</p>
<ul>
<li>The files parent directory does not exist.</li>
<li>The current process lacks permissions to write to the file.</li>
<li>Some other I/O error occurred.</li>
</ul>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code>async_fs::write(<span class="string">"a.txt"</span>, <span class="string">b"Hello world!"</span>).<span class="kw">await</span><span class="question-mark">?</span>;</code></pre></div>
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