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<article role="main" id="furo-main-content">
<section id="memorystream">
<h1>MemoryStream<a class="headerlink" href="#memorystream" title="Link to this heading">¶</a></h1>
<p>Qualified name: <code class="docutils literal notranslate"><span class="pre">delphivcl.MemoryStream</span></code></p>
<dl class="py class">
<dt class="sig sig-object py" id="delphivcl.MemoryStream">
<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">MemoryStream</span></span><a class="headerlink" href="#delphivcl.MemoryStream" title="Link to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="delphivcl.CustomMemoryStream.html#delphivcl.CustomMemoryStream" title="delphivcl.CustomMemoryStream"><code class="xref py py-class docutils literal notranslate"><span class="pre">CustomMemoryStream</span></code></a></p>
<p>TMemoryStream is a stream that stores its data in dynamic memory.
Use TMemoryStream to store data in a dynamic memory buffer that is enhanced with file-like access capabilities. TMemoryStream provides the general I/O capabilities of a stream object while introducing methods and properties to manage a dynamic memory buffer.
Memory streams are useful as intermediary objects that can hold information as well as read it from or write it to another storage medium. They provide a useful format for comparing the contents of streams, or for manipulating data that is stored in a less accessible medium.</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.MemoryStream.Clear" title="delphivcl.MemoryStream.Clear"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Clear</span></code></a></p></td>
<td><p>Frees the memory buffer, discarding all data associated with the memory stream.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.MemoryStream.LoadFromFile" title="delphivcl.MemoryStream.LoadFromFile"><code class="xref py py-obj docutils literal notranslate"><span class="pre">LoadFromFile</span></code></a></p></td>
<td><p>TMemoryStream.LoadFromFile(FileName: str) -> None Loads the entire contents of a file into the memory buffer.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.MemoryStream.LoadFromStream" title="delphivcl.MemoryStream.LoadFromStream"><code class="xref py py-obj docutils literal notranslate"><span class="pre">LoadFromStream</span></code></a></p></td>
<td><p>TMemoryStream.LoadFromStream(Stream: Stream) -> None Loads the entire contents of a stream into the memory buffer.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.MemoryStream.ReadBytes" title="delphivcl.MemoryStream.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.MemoryStream.ReadFloat" title="delphivcl.MemoryStream.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.MemoryStream.ReadInt" title="delphivcl.MemoryStream.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.MemoryStream.ReadString" title="delphivcl.MemoryStream.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.MemoryStream.SetSize" title="delphivcl.MemoryStream.SetSize"><code class="xref py py-obj docutils literal notranslate"><span class="pre">SetSize</span></code></a></p></td>
<td><p>TMemoryStream.SetSize(NewSize: int) -> None Sets the Size property of the memory stream.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="#delphivcl.MemoryStream.Write" title="delphivcl.MemoryStream.Write"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Write</span></code></a></p></td>
<td><p>TMemoryStream.Write(Buffer, Count: int) -> int Writes Count bytes from Buffer to the current position in the memory buffer and updates the current position by Count bytes.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="#delphivcl.MemoryStream.WriteBytes" title="delphivcl.MemoryStream.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.MemoryStream.WriteFloat" title="delphivcl.MemoryStream.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.MemoryStream.WriteInt" title="delphivcl.MemoryStream.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.MemoryStream.WriteString" title="delphivcl.MemoryStream.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.MemoryStream.ClassName" title="delphivcl.MemoryStream.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><code class="xref py py-obj docutils literal notranslate"><span class="pre">Memory</span></code></p></td>
<td><p>Provides direct access to the memory pool allocated for the memory stream.</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.MemoryStream.ClassName">
<span class="sig-name descname"><span class="pre">ClassName</span></span><a class="headerlink" href="#delphivcl.MemoryStream.ClassName" title="Link to this definition">¶</a></dt>
<dd><p>Returns the TObject.ClassName</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.MemoryStream.Clear">
<span class="sig-name descname"><span class="pre">Clear</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#delphivcl.MemoryStream.Clear" title="Link to this definition">¶</a></dt>
<dd><p>Frees the memory buffer, discarding all data associated with the memory stream.
Use Clear to empty the memory buffer for the memory stream and free all associated memory. In addition to freeing the memory associated with the memory buffer, Clear:</p>
<p>Sets the Memory property to nil (Delphi) or NULL (C++).
Sets the Position property to 0.
Sets the Size property to 0.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.MemoryStream.LoadFromFile">
<span class="sig-name descname"><span class="pre">LoadFromFile</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">FileName</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</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">None</span></span></span><a class="headerlink" href="#delphivcl.MemoryStream.LoadFromFile" title="Link to this definition">¶</a></dt>
<dd><p>Loads the entire contents of a file into the memory buffer.
Use LoadFromFile to fill the memory stream with the contents of a file. Pass the name of the file as the FileName parameter. LoadFromFile allows an application to read the contents of a file into the memory stream without having to explicitly create and free a file stream object.
LoadFromFile reallocates the memory buffer so that the contents of the file will exactly fit. It sets the Size property accordingly, and then reads the entire contents of the file into the memory buffer. Thus, LoadFromFile will discard any pre-existing data stored in the memory stream.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.MemoryStream.LoadFromStream">
<span class="sig-name descname"><span class="pre">LoadFromStream</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">Stream</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><a class="reference internal" href="delphivcl.Stream.html#delphivcl.Stream" title="delphivcl.Stream"><span class="pre">Stream</span></a></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">None</span></span></span><a class="headerlink" href="#delphivcl.MemoryStream.LoadFromStream" title="Link to this definition">¶</a></dt>
<dd><p>Loads the entire contents of a stream into the memory buffer.
Use LoadFromStream to fill the memory stream with the contents of the stream specified by the Stream parameter. LoadFromStream always sets the Position of the source stream to 0, before streaming in the number of bytes indicated by the source stream’s Size property.
LoadFromStream reallocates the memory buffer so that the contents of the source stream will exactly fit. It sets the Size property accordingly, and then reads the entire contents of the source stream into the memory buffer. Thus, LoadFromStream will discard any pre-existing data stored in the memory stream.
If the source stream is a TFileStream object, LoadFromStream does the same thing as LoadFromFile, except that the application must create and free the TFileStream object. LoadFromStream also allows applications to fill a memory stream object from other types of stream objects.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.SetSize">
<span class="sig-name descname"><span class="pre">SetSize</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">NewSize</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">None</span></span></span><a class="headerlink" href="#delphivcl.MemoryStream.SetSize" title="Link to this definition">¶</a></dt>
<dd><p>Sets the Size property of the memory stream.
Use SetSize to set the Size of a memory stream before filling it with data. SetSize allocates the memory buffer to hold NewSize bytes, preserving as much of the existing data as possible.
Use SetSize before filling the memory buffer with data from various sources, or from a portion of another stream. If the intended contents of the memory stream is exactly the same as the contents of another stream or file, use LoadFromStream or LoadFromFile instead.
Sets the Size property of the memory stream.
Use SetSize to set the Size of a memory stream before filling it with data. SetSize allocates the memory buffer to hold NewSize bytes, preserving as much of the existing data as possible.
Use SetSize before filling the memory buffer with data from various sources, or from a portion of another stream. If the intended contents of the memory stream is exactly the same as the contents of another stream or file, use LoadFromStream or LoadFromFile instead.</p>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="delphivcl.MemoryStream.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.MemoryStream.Write" title="Link to this definition">¶</a></dt>
<dd><p>Writes Count bytes from Buffer to the current position in the memory buffer and updates the current position by Count bytes.
Use Write to insert Count bytes into the memory buffer of the memory stream, starting at the current position. Write will increase the size of the memory buffer, if necessary, to accommodate the data being written in. If the current position is not the end of the memory buffer, Write will overwrite the data following the current position.
Write updates the Size property to Position + Count, and sets the Position property to the new value of Size. Thus, any data that was stored in the memory stream in the Count bytes after the current position is lost when calling Write.
Write always writes the Count bytes in the Buffer, unless there is a memory failure. Thus, for TMemoryStream, Write is equivalent to the WriteBuffer method.
All other data-writing methods of a memory 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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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.MemoryStream.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="#">MemoryStream</a><ul>
<li><a class="reference internal" href="#delphivcl.MemoryStream"><code class="docutils literal notranslate"><span class="pre">MemoryStream</span></code></a><ul>
<li><a class="reference internal" href="#delphivcl.MemoryStream.ClassName"><code class="docutils literal notranslate"><span class="pre">MemoryStream.ClassName</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.Clear"><code class="docutils literal notranslate"><span class="pre">MemoryStream.Clear()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.LoadFromFile"><code class="docutils literal notranslate"><span class="pre">MemoryStream.LoadFromFile()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.LoadFromStream"><code class="docutils literal notranslate"><span class="pre">MemoryStream.LoadFromStream()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.ReadBytes"><code class="docutils literal notranslate"><span class="pre">MemoryStream.ReadBytes()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.ReadFloat"><code class="docutils literal notranslate"><span class="pre">MemoryStream.ReadFloat()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.ReadInt"><code class="docutils literal notranslate"><span class="pre">MemoryStream.ReadInt()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.ReadString"><code class="docutils literal notranslate"><span class="pre">MemoryStream.ReadString()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.SetSize"><code class="docutils literal notranslate"><span class="pre">MemoryStream.SetSize()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.Write"><code class="docutils literal notranslate"><span class="pre">MemoryStream.Write()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.WriteBytes"><code class="docutils literal notranslate"><span class="pre">MemoryStream.WriteBytes()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.WriteFloat"><code class="docutils literal notranslate"><span class="pre">MemoryStream.WriteFloat()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.WriteInt"><code class="docutils literal notranslate"><span class="pre">MemoryStream.WriteInt()</span></code></a></li>
<li><a class="reference internal" href="#delphivcl.MemoryStream.WriteString"><code class="docutils literal notranslate"><span class="pre">MemoryStream.WriteString()</span></code></a></li>
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