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<article role="main" id="furo-main-content">
<section id="handlestream">
<h1>HandleStream<a class="headerlink" href="#handlestream" title="Link to this heading">¶</a></h1>
<p>Qualified name: <code class="docutils literal notranslate"><span class="pre">delphivcl.HandleStream</span></code></p>
<dl class="py class">
<dt class="sig sig-object py" id="delphivcl.HandleStream">
<em class="property"><span class="k"><span class="pre">class</span></span><span class="w"> </span></em><span class="sig-name descname"><span class="pre">HandleStream</span></span><a class="headerlink" href="#delphivcl.HandleStream" title="Link to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="delphivcl.Stream.html#delphivcl.Stream" title="delphivcl.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">Stream</span></code></a></p>
<p>THandleStream enables applications to read from and write to communications resources identified by a handle.
Use THandleStream to access files, sockets, named pipes, mailslots, or other communications resources that provide a handle when opened. For example, the FileOpen function provides a handle for a file on disk. THandleStream allows applications to use a uniform stream interface when performing I/O using a handle.
To avoid the overhead of managing file handles, use TFileStream to work with disk files.</p>
<p class="rubric">Methods</p>
<div class="table-wrapper autosummary longtable docutils container">
<table class="autosummary longtable docutils align-default">
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.Read" title="delphivcl.HandleStream.Read"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Read</span></code></a></p></td>
<td><p>THandleStream.Read(Buffer, Count: int) -> int Reads up to Count bytes of data from the resource associated with the handle stream into Buffer.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.ReadBytes" title="delphivcl.HandleStream.ReadBytes"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ReadBytes</span></code></a></p></td>
<td><p>TPyDelphiStream.ReadBytes() Read content as bytes.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.ReadFloat" title="delphivcl.HandleStream.ReadFloat"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ReadFloat</span></code></a></p></td>
<td><p>TPyDelphiStream.ReadFloat() Read content as float.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.ReadInt" title="delphivcl.HandleStream.ReadInt"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ReadInt</span></code></a></p></td>
<td><p>TPyDelphiStream.ReadInt() Read content as integer.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.ReadString" title="delphivcl.HandleStream.ReadString"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ReadString</span></code></a></p></td>
<td><p>TPyDelphiStream.ReadString() Read content as string.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.Seek" title="delphivcl.HandleStream.Seek"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Seek</span></code></a></p></td>
<td><p>THandleStream.Seek(Offset: int, Origin: SeekOrigin) -> int Resets the current position of the handle stream.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.Write" title="delphivcl.HandleStream.Write"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Write</span></code></a></p></td>
<td><p>THandleStream.Write(Buffer, Count: int) -> int Writes Count bytes from the Buffer to the current position in the resource.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.WriteBytes" title="delphivcl.HandleStream.WriteBytes"><code class="xref py py-obj docutils literal notranslate"><span class="pre">WriteBytes</span></code></a></p></td>
<td><p>TPyDelphiStream.WriteBytes() Write content as bytes.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.WriteFloat" title="delphivcl.HandleStream.WriteFloat"><code class="xref py py-obj docutils literal notranslate"><span class="pre">WriteFloat</span></code></a></p></td>
<td><p>TPyDelphiStream.WriteFloat() Write content as float.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.WriteInt" title="delphivcl.HandleStream.WriteInt"><code class="xref py py-obj docutils literal notranslate"><span class="pre">WriteInt</span></code></a></p></td>
<td><p>TPyDelphiStream.WriteInt() Write content as integer.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.WriteString" title="delphivcl.HandleStream.WriteString"><code class="xref py py-obj docutils literal notranslate"><span class="pre">WriteString</span></code></a></p></td>
<td><p>TPyDelphiStream.WriteString() Write content as string.</p></td>
</tr>
</tbody>
</table>
</div>
<p class="rubric">Attributes</p>
<div class="table-wrapper autosummary longtable docutils container">
<table class="autosummary longtable docutils align-default">
<tbody>
<tr class="row-odd"><td><p><code class="xref py py-obj docutils literal notranslate"><span class="pre">Capabilities</span></code></p></td>
<td><p>StreamCapabilities:</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.HandleStream.ClassName" title="delphivcl.HandleStream.ClassName"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ClassName</span></code></a></p></td>
<td><p>Returns the TObject.ClassName</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.HandleStream.Handle" title="delphivcl.HandleStream.Handle"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Handle</span></code></a></p></td>
<td><p>Specifies the handle for the communications resource the stream reads from and writes to.</p></td>
</tr>
<tr class="row-even"><td><p><code class="xref py py-obj docutils literal notranslate"><span class="pre">Position</span></code></p></td>
<td><p>Indicates the current offset into the stream for reading and writing.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="xref py py-obj docutils literal notranslate"><span class="pre">Size</span></code></p></td>
<td><p>Indicates the size in bytes of the stream.</p></td>
</tr>
</tbody>
</table>
</div>
<dl class="py attribute">
<dt class="sig sig-object py" id="delphivcl.HandleStream.ClassName">
<span class="sig-name descname"><span class="pre">ClassName</span></span><a class="headerlink" href="#delphivcl.HandleStream.ClassName" title="Link to this definition">¶</a></dt>
<dd><p>Returns the TObject.ClassName</p>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="delphivcl.HandleStream.Handle">
<span class="sig-name descname"><span class="pre">Handle</span></span><a class="headerlink" href="#delphivcl.HandleStream.Handle" title="Link to this definition">¶</a></dt>
<dd><p>Specifies the handle for the communications resource the stream reads from and writes to.
Read Handle to get the handle for file management functions. To read from or write to the resource, use the methods of the THandleStream object.
Handle is a read-only property. The handle property cannot be changed to allow the handle stream to switch from reading to writing or vice versa. For example, to change from a file handle that is opened in read-only mode to one that is opened in write mode:</p>
<p>Free the stream object.
Call FileClose to close the file.
Reopen the file in write mode and use the handle to create a new instance of a handle stream. Alternately, open a TFileStream object for the file, specifying a write mode for the stream.
Note: Do not call the FileClose function on the Handle until after the THandleStream object has been destroyed.</p>
<dl class="field-list simple">
<dt class="field-odd">Type<span class="colon">:</span></dt>
<dd class="field-odd"><p>int</p>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.Read">
<span class="sig-name descname"><span class="pre">Read</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">Buffer</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">Count</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><span class="pre">int</span></span></span><a class="headerlink" href="#delphivcl.HandleStream.Read" title="Link to this definition">¶</a></dt>
<dd><p>Reads up to Count bytes of data from the resource associated with the handle stream into Buffer.
Use Read to read data from the resource associated with the handle stream when the number of bytes in the file is not known. Read transfers up to Count bytes from the resource, starting at the current position, and then advances the current position in the resource by the number of bytes actually transferred. Read returns the number of bytes actually transferred, which may be less than Count if the end of file marker is encountered.
All other data-reading methods of a handle stream (ReadBuffer, ReadComponent) call Read to do the actual reading.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.ReadBytes">
<span class="sig-name descname"><span class="pre">ReadBytes</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.ReadBytes" title="Link to this definition">¶</a></dt>
<dd><p>Read content as bytes.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.ReadFloat">
<span class="sig-name descname"><span class="pre">ReadFloat</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.ReadFloat" title="Link to this definition">¶</a></dt>
<dd><p>Read content as float.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.ReadInt">
<span class="sig-name descname"><span class="pre">ReadInt</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.ReadInt" title="Link to this definition">¶</a></dt>
<dd><p>Read content as integer.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.ReadString">
<span class="sig-name descname"><span class="pre">ReadString</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.ReadString" title="Link to this definition">¶</a></dt>
<dd><p>Read content as string.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.Seek">
<span class="sig-name descname"><span class="pre">Seek</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">Offset</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">Origin</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">SeekOrigin</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><span class="pre">int</span></span></span><a class="headerlink" href="#delphivcl.HandleStream.Seek" title="Link to this definition">¶</a></dt>
<dd><p>Resets the current position of the handle stream.
Use Seek to move the current position within the resource associated with the handle stream by the indicated offset. Seek allows an application to read from or write to a particular location within the resource.
The Origin parameter indicates how to interpret the Offset parameter. Origin should be one of the following values:</p>
<p>Value</p>
<p>Meaning</p>
<p>soFromBeginning</p>
<p>Offset is from the beginning of the resource. Seek moves to the position Offset. Offset must be >= 0.</p>
<p>soFromCurrent</p>
<p>Offset is from the current position in the resource. Seek moves to Position + Offset.</p>
<p>soFromEnd</p>
<p>Offset is from the end of the resource. Offset must be <= 0 to indicate a number of bytes before the end of the file.</p>
<p>Or you can also use TSeekOrigin and its values to indicate where to start a seek operation.
Seek returns the new value of the Position property, the new current position in the resource.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.Write">
<span class="sig-name descname"><span class="pre">Write</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">Buffer</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">Count</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">int</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><span class="pre">int</span></span></span><a class="headerlink" href="#delphivcl.HandleStream.Write" title="Link to this definition">¶</a></dt>
<dd><p>Writes Count bytes from the Buffer to the current position in the resource.
Use Write to write Count bytes to the resource associated with the handle stream, starting at the current position. After writing to the resource, Write advances the current position by the number bytes written, and returns the number of bytes written.
All other data-writing methods of a handle stream (WriteBuffer, WriteComponent) call Write to do the actual writing.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.WriteBytes">
<span class="sig-name descname"><span class="pre">WriteBytes</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.WriteBytes" title="Link to this definition">¶</a></dt>
<dd><p>Write content as bytes.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.WriteFloat">
<span class="sig-name descname"><span class="pre">WriteFloat</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.WriteFloat" title="Link to this definition">¶</a></dt>
<dd><p>Write content as float.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.WriteInt">
<span class="sig-name descname"><span class="pre">WriteInt</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.WriteInt" title="Link to this definition">¶</a></dt>
<dd><p>Write content as integer.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.HandleStream.WriteString">
<span class="sig-name descname"><span class="pre">WriteString</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.HandleStream.WriteString" title="Link to this definition">¶</a></dt>
<dd><p>Write content as string.</p>
</dd></dl>
</dd></dl>
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<ul>
<li><a class="reference internal" href="#">HandleStream</a><ul>
<li><a class="reference internal" href="#delphivcl.HandleStream"><code class="docutils literal notranslate"><span class="pre">HandleStream</span></code></a><ul>
<li><a class="reference internal" href="#delphivcl.HandleStream.ClassName"><code class="docutils literal notranslate"><span class="pre">HandleStream.ClassName</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.Handle"><code class="docutils literal notranslate"><span class="pre">HandleStream.Handle</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.Read"><code class="docutils literal notranslate"><span class="pre">HandleStream.Read()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.ReadBytes"><code class="docutils literal notranslate"><span class="pre">HandleStream.ReadBytes()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.ReadFloat"><code class="docutils literal notranslate"><span class="pre">HandleStream.ReadFloat()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.ReadInt"><code class="docutils literal notranslate"><span class="pre">HandleStream.ReadInt()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.ReadString"><code class="docutils literal notranslate"><span class="pre">HandleStream.ReadString()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.Seek"><code class="docutils literal notranslate"><span class="pre">HandleStream.Seek()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.Write"><code class="docutils literal notranslate"><span class="pre">HandleStream.Write()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.WriteBytes"><code class="docutils literal notranslate"><span class="pre">HandleStream.WriteBytes()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.WriteFloat"><code class="docutils literal notranslate"><span class="pre">HandleStream.WriteFloat()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.WriteInt"><code class="docutils literal notranslate"><span class="pre">HandleStream.WriteInt()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.HandleStream.WriteString"><code class="docutils literal notranslate"><span class="pre">HandleStream.WriteString()</span></code></a></li>
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