# CSJ2K.j2k.fileformat.reader.FileFormatReader.readFileFormat

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<h1 id="CSJ2K_j2k_fileformat_reader_FileFormatReader_readFileFormat_" data-uid="CSJ2K.j2k.fileformat.reader.FileFormatReader.readFileFormat*">readFileFormat Method
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<a id="CSJ2K_j2k_fileformat_reader_FileFormatReader_readFileFormat_" data-uid="CSJ2K.j2k.fileformat.reader.FileFormatReader.readFileFormat*"></a>
<h4 id="CSJ2K_j2k_fileformat_reader_FileFormatReader_readFileFormat" data-uid="CSJ2K.j2k.fileformat.reader.FileFormatReader.readFileFormat">readFileFormat()</h4>
<div class="markdown level1 summary"><p>This method checks whether the given RandomAccessIO is a valid JP2 file
and if so finds the first codestream in the file. Currently, the
information in the codestream is not used</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public virtual void readFileFormat()</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Overridable Sub readFileFormat()</code></pre>
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