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<h1 class="title">std/asyncfile</h1>
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<a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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<details open>
<summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
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<li><a class="reference" href="#AsyncFile" title="AsyncFile = ref object">AsyncFile</a></li>
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<details open>
<summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
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<ul class="simple nested-toc-section">close
<li><a class="reference" href="#close%2CAsyncFile" title="close(f: AsyncFile)">close(f: AsyncFile)</a></li>
</ul>
<ul class="simple nested-toc-section">getFilePos
<li><a class="reference" href="#getFilePos%2CAsyncFile" title="getFilePos(f: AsyncFile): int64">getFilePos(f: AsyncFile): int64</a></li>
</ul>
<ul class="simple nested-toc-section">getFileSize
<li><a class="reference" href="#getFileSize%2CAsyncFile" title="getFileSize(f: AsyncFile): int64">getFileSize(f: AsyncFile): int64</a></li>
</ul>
<ul class="simple nested-toc-section">newAsyncFile
<li><a class="reference" href="#newAsyncFile%2CAsyncFD" title="newAsyncFile(fd: AsyncFD): AsyncFile">newAsyncFile(fd: AsyncFD): AsyncFile</a></li>
</ul>
<ul class="simple nested-toc-section">openAsync
<li><a class="reference" href="#openAsync%2Cstring" title="openAsync(filename: string; mode = fmRead): AsyncFile">openAsync(filename: string; mode = fmRead): AsyncFile</a></li>
</ul>
<ul class="simple nested-toc-section">read
<li><a class="reference" href="#read%2CAsyncFile%2Cint" title="read(f: AsyncFile; size: int): Future[string]">read(f: AsyncFile; size: int): Future[string]</a></li>
</ul>
<ul class="simple nested-toc-section">readAll
<li><a class="reference" href="#readAll%2CAsyncFile" title="readAll(f: AsyncFile): Future[string]">readAll(f: AsyncFile): Future[string]</a></li>
</ul>
<ul class="simple nested-toc-section">readBuffer
<li><a class="reference" href="#readBuffer%2CAsyncFile%2Cpointer%2Cint" title="readBuffer(f: AsyncFile; buf: pointer; size: int): Future[int]">readBuffer(f: AsyncFile; buf: pointer; size: int): Future[int]</a></li>
</ul>
<ul class="simple nested-toc-section">readLine
<li><a class="reference" href="#readLine%2CAsyncFile" title="readLine(f: AsyncFile): Future[string]">readLine(f: AsyncFile): Future[string]</a></li>
</ul>
<ul class="simple nested-toc-section">readToStream
<li><a class="reference" href="#readToStream%2CAsyncFile%2CFutureStream%5Bstring%5D" title="readToStream(f: AsyncFile; fs: FutureStream[string]): owned(Future[void])">readToStream(f: AsyncFile; fs: FutureStream[string]): owned(Future[void])</a></li>
</ul>
<ul class="simple nested-toc-section">setFilePos
<li><a class="reference" href="#setFilePos%2CAsyncFile%2Cint64" title="setFilePos(f: AsyncFile; pos: int64)">setFilePos(f: AsyncFile; pos: int64)</a></li>
</ul>
<ul class="simple nested-toc-section">setFileSize
<li><a class="reference" href="#setFileSize%2CAsyncFile%2Cint64" title="setFileSize(f: AsyncFile; length: int64)">setFileSize(f: AsyncFile; length: int64)</a></li>
</ul>
<ul class="simple nested-toc-section">write
<li><a class="reference" href="#write%2CAsyncFile%2Cstring" title="write(f: AsyncFile; data: string): Future[void]">write(f: AsyncFile; data: string): Future[void]</a></li>
</ul>
<ul class="simple nested-toc-section">writeBuffer
<li><a class="reference" href="#writeBuffer%2CAsyncFile%2Cpointer%2Cint" title="writeBuffer(f: AsyncFile; buf: pointer; size: int): Future[void]">writeBuffer(f: AsyncFile; buf: pointer; size: int): Future[void]</a></li>
</ul>
<ul class="simple nested-toc-section">writeFromStream
<li><a class="reference" href="#writeFromStream%2CAsyncFile%2CFutureStream%5Bstring%5D" title="writeFromStream(f: AsyncFile; fs: FutureStream[string]): owned(Future[void])">writeFromStream(f: AsyncFile; fs: FutureStream[string]): owned(Future[void])</a></li>
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<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
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<p class="module-desc"><p>This module implements asynchronous file reading and writing.</p>
<p><pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Punctuation">[</span><span class="Identifier">asyncfile</span><span class="Punctuation">,</span> <span class="Identifier">asyncdispatch</span><span class="Punctuation">,</span> <span class="Identifier">os</span><span class="Punctuation">]</span>
<span class="Keyword">proc</span> <span class="Identifier">main</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Punctuation">{</span><span class="Operator">.</span><span class="Identifier">async</span><span class="Operator">.</span><span class="Punctuation">}</span> <span class="Operator">=</span>
<span class="Keyword">var</span> <span class="Identifier">file</span> <span class="Operator">=</span> <span class="Identifier">openAsync</span><span class="Punctuation">(</span><span class="Identifier">getTempDir</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Operator">/</span> <span class="StringLit">&quot;foobar.txt&quot;</span><span class="Punctuation">,</span> <span class="Identifier">fmReadWrite</span><span class="Punctuation">)</span>
<span class="Identifier">await</span> <span class="Identifier">file</span><span class="Operator">.</span><span class="Identifier">write</span><span class="Punctuation">(</span><span class="StringLit">&quot;test&quot;</span><span class="Punctuation">)</span>
<span class="Identifier">file</span><span class="Operator">.</span><span class="Identifier">setFilePos</span><span class="Punctuation">(</span><span class="DecNumber">0</span><span class="Punctuation">)</span>
<span class="Keyword">let</span> <span class="Identifier">data</span> <span class="Operator">=</span> <span class="Identifier">await</span> <span class="Identifier">file</span><span class="Operator">.</span><span class="Identifier">readAll</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
<span class="Identifier">doAssert</span> <span class="Identifier">data</span> <span class="Operator">==</span> <span class="StringLit">&quot;test&quot;</span>
<span class="Identifier">file</span><span class="Operator">.</span><span class="Identifier">close</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
<span class="Identifier">waitFor</span> <span class="Identifier">main</span><span class="Punctuation">(</span><span class="Punctuation">)</span></pre></p>
</p>
<div class="section" id="6">
<h1><a class="toc-backref" href="#6">Imports</a></h1>
<dl class="item">
<a class="reference external" href="asyncdispatch.html">asyncdispatch</a>, <a class="reference external" href="os.html">os</a>, <a class="reference external" href="assertions.html">assertions</a>, <a class="reference external" href="syncio.html">syncio</a>, <a class="reference external" href="widestrs.html">widestrs</a>, <a class="reference external" href="winlean.html">winlean</a>
</dl>
</div>
<div class="section" id="7">
<h1><a class="toc-backref" href="#7">Types</a></h1>
<dl class="item">
<div id="AsyncFile">
<dt><pre><a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a> <span class="Other">=</span> <span class="Keyword">ref</span> <span class="Keyword">object</span></pre></dt>
<dd>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L41" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L41" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
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</dl>
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<div class="section" id="12">
<h1><a class="toc-backref" href="#12">Procs</a></h1>
<dl class="item">
<div id="close-procs-all">
<div id="close,AsyncFile">
<dt><pre><span class="Keyword">proc</span> <a href="#close%2CAsyncFile"><span class="Identifier">close</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Closes the file specified.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L505" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L505" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="getFilePos-procs-all">
<div id="getFilePos,AsyncFile">
<dt><pre><span class="Keyword">proc</span> <a href="#getFilePos%2CAsyncFile"><span class="Identifier">getFilePos</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int64"><span class="Identifier">int64</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Retrieves the current position of the file pointer that is used to read from the specified file. The file's first byte has the index zero.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L314" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L314" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="getFileSize-procs-all">
<div id="getFileSize,AsyncFile">
<dt><pre><span class="Keyword">proc</span> <a href="#getFileSize%2CAsyncFile"><span class="Identifier">getFileSize</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int64"><span class="Identifier">int64</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Retrieves the specified file's size.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L78" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L78" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
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<div id="newAsyncFile-procs-all">
<div id="newAsyncFile,AsyncFD">
<dt><pre><span class="Keyword">proc</span> <a href="#newAsyncFile%2CAsyncFD"><span class="Identifier">newAsyncFile</span></a><span class="Other">(</span><span class="Identifier">fd</span><span class="Other">:</span> <a href="asyncdispatch.html#AsyncFD"><span class="Identifier">AsyncFD</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Creates <tt class="docutils literal"><span class="pre"><span class="Identifier">AsyncFile</span></span></tt> with a previously opened file descriptor <tt class="docutils literal"><span class="pre"><span class="Identifier">fd</span></span></tt>.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L92" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L92" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="openAsync-procs-all">
<div id="openAsync,string">
<dt><pre><span class="Keyword">proc</span> <a href="#openAsync%2Cstring"><span class="Identifier">openAsync</span></a><span class="Other">(</span><span class="Identifier">filename</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">;</span> <span class="Identifier">mode</span> <span class="Other">=</span> <span class="Identifier">fmRead</span><span class="Other">)</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Opens a file specified by the path in <tt class="docutils literal"><span class="pre"><span class="Identifier">filename</span></span></tt> using the specified FileMode <tt class="docutils literal"><span class="pre"><span class="Identifier">mode</span></span></tt> asynchronously.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L98" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L98" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="read-procs-all">
<div id="read,AsyncFile,int">
<dt><pre><span class="Keyword">proc</span> <a href="#read%2CAsyncFile%2Cint"><span class="Identifier">read</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">size</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">]</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ValueError</span><span class="Other">,</span> <span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Read <tt class="docutils literal"><span class="pre"><span class="Identifier">size</span></span></tt> bytes from the specified file asynchronously starting at the current position of the file pointer. <tt class="docutils literal"><span class="pre"><span class="Identifier">size</span></span></tt> should be greater than zero.</p>
<p>If the file pointer is past the end of the file then an empty string is returned.</p>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L204" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L204" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="readAll-procs-all">
<div id="readAll,AsyncFile">
<dt><pre><span class="Keyword">proc</span> <a href="#readAll%2CAsyncFile"><span class="Identifier">readAll</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">]</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">stackTrace</span><span class="Other">:</span> <span class="DecNumber">false</span><span class="Other">,</span>
<span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Reads all data from the specified file.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L329" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L329" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="readBuffer-procs-all">
<div id="readBuffer,AsyncFile,pointer,int">
<dt><pre><span class="Keyword">proc</span> <a href="#readBuffer%2CAsyncFile%2Cpointer%2Cint"><span class="Identifier">readBuffer</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">buf</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">;</span> <span class="Identifier">size</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">]</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">ValueError</span><span class="Other">,</span> <span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Read <tt class="docutils literal"><span class="pre"><span class="Identifier">size</span></span></tt> bytes from the specified file asynchronously starting at the current position of the file pointer.</p>
<p>If the file pointer is past the end of the file then zero is returned and no bytes are read into <tt class="docutils literal"><span class="pre"><span class="Identifier">buf</span></span></tt></p>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L127" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L127" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="readLine-procs-all">
<div id="readLine,AsyncFile">
<dt><pre><span class="Keyword">proc</span> <a href="#readLine%2CAsyncFile"><span class="Identifier">readLine</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">]</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">stackTrace</span><span class="Other">:</span> <span class="DecNumber">false</span><span class="Other">,</span>
<span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Reads a single line from the specified file asynchronously.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L299" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L299" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="readToStream-procs-all">
<div id="readToStream,AsyncFile,FutureStream[string]">
<dt><pre><span class="Keyword">proc</span> <a href="#readToStream%2CAsyncFile%2CFutureStream%5Bstring%5D"><span class="Identifier">readToStream</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">fs</span><span class="Other">:</span> <a href="asyncstreams.html#FutureStream"><span class="Identifier">FutureStream</span></a><span class="Other">[</span><a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#owned"><span class="Identifier">owned</span></a><span class="Other">(</span>
<a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#void"><span class="Identifier">void</span></a><span class="Other">]</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">stackTrace</span><span class="Other">:</span> <span class="DecNumber">false</span><span class="Other">,</span> <span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Writes data to the specified future stream as the file is read.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L529" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L529" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="setFilePos-procs-all">
<div id="setFilePos,AsyncFile,int64">
<dt><pre><span class="Keyword">proc</span> <a href="#setFilePos%2CAsyncFile%2Cint64"><span class="Identifier">setFilePos</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">pos</span><span class="Other">:</span> <a href="system.html#int64"><span class="Identifier">int64</span></a><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Sets the position of the file pointer that is used for read/write operations. The file's first byte has the index zero.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L320" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L320" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="setFileSize-procs-all">
<div id="setFileSize,AsyncFile,int64">
<dt><pre><span class="Keyword">proc</span> <a href="#setFileSize%2CAsyncFile%2Cint64"><span class="Identifier">setFileSize</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">length</span><span class="Other">:</span> <a href="system.html#int64"><span class="Identifier">int64</span></a><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">OSError</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
Set a file length.
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L488" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L488" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="write-procs-all">
<div id="write,AsyncFile,string">
<dt><pre><span class="Keyword">proc</span> <a href="#write%2CAsyncFile%2Cstring"><span class="Identifier">write</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">data</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#void"><span class="Identifier">void</span></a><span class="Other">]</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Writes <tt class="docutils literal"><span class="pre"><span class="Identifier">data</span></span></tt> to the file specified asynchronously.</p>
<p>The returned Future will complete once all data has been written to the specified file.</p>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L407" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L407" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="writeBuffer-procs-all">
<div id="writeBuffer,AsyncFile,pointer,int">
<dt><pre><span class="Keyword">proc</span> <a href="#writeBuffer%2CAsyncFile%2Cpointer%2Cint"><span class="Identifier">writeBuffer</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">buf</span><span class="Other">:</span> <a href="system.html#pointer"><span class="Identifier">pointer</span></a><span class="Other">;</span> <span class="Identifier">size</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">)</span><span class="Other">:</span> <a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#void"><span class="Identifier">void</span></a><span class="Other">]</span> {.
<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Writes <tt class="docutils literal"><span class="pre"><span class="Identifier">size</span></span></tt> bytes from <tt class="docutils literal"><span class="pre"><span class="Identifier">buf</span></span></tt> to the file specified asynchronously.</p>
<p>The returned Future will complete once all data has been written to the specified file.</p>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L338" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L338" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
<div id="writeFromStream-procs-all">
<div id="writeFromStream,AsyncFile,FutureStream[string]">
<dt><pre><span class="Keyword">proc</span> <a href="#writeFromStream%2CAsyncFile%2CFutureStream%5Bstring%5D"><span class="Identifier">writeFromStream</span></a><span class="Other">(</span><span class="Identifier">f</span><span class="Other">:</span> <a href="asyncfile.html#AsyncFile"><span class="Identifier">AsyncFile</span></a><span class="Other">;</span> <span class="Identifier">fs</span><span class="Other">:</span> <a href="asyncstreams.html#FutureStream"><span class="Identifier">FutureStream</span></a><span class="Other">[</span><a href="system.html#string"><span class="Identifier">string</span></a><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#owned"><span class="Identifier">owned</span></a><span class="Other">(</span>
<a href="asyncfutures.html#Future"><span class="Identifier">Future</span></a><span class="Other">[</span><a href="system.html#void"><span class="Identifier">void</span></a><span class="Other">]</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">stackTrace</span><span class="Other">:</span> <span class="DecNumber">false</span><span class="Other">,</span> <span class="Identifier">raises</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">Exception</span><span class="Other">,</span> <span class="Identifier">ValueError</span><span class="Other">]</span><span class="Other">,</span>
<span class="Identifier">tags</span><span class="Other">:</span> <span class="Other">[</span><span class="Identifier">RootEffect</span><span class="Other">]</span><span class="Other">,</span> <span class="Identifier">forbids</span><span class="Other">:</span> <span class="Other">[</span><span class="Other">]</span></span>.}</pre></dt>
<dd>
<p>Reads data from the specified future stream until it is completed. The data which is read is written to the file immediately and freed from memory.</p>
<p>This procedure is perfect for saving streamed data to a file without wasting memory.</p>
<a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/asyncfile.nim#L515" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/asyncfile.nim#L515" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
</dd>
</div>
</div>
</dl>
</div>
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