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<title>CCfits: Reading Header information from a HDU</title>
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<h1><a class="anchor" id="readhead">Reading Header information from a HDU </a></h1><p>This function demonstrates selecting one HDU from the file, reading the header information and printing out the keys that have been read and the descriptions of the columns.</p>
<p>The readData flag is by default false (see below for the alternative case), which means that the data in the column is not read.</p>
<div class="fragment"><pre class="fragment"><span class="keywordtype">int</span> readHeader()
{
<span class="keyword">const</span> <span class="keywordtype">string</span> SPECTRUM(<span class="stringliteral">"SPECTRUM"</span>);
<span class="comment">// read a particular HDU within the file. This call reads just the header </span>
<span class="comment">// information from SPECTRUM</span>
std::auto_ptr<FITS> pInfile(<span class="keyword">new</span> FITS(<span class="stringliteral">"file1.pha"</span>,Read,SPECTRUM));
<span class="comment">// define a reference for clarity. (std::auto_ptr<T>::get returns a pointer</span>
ExtHDU& table = pInfile->extension(SPECTRUM);
<span class="comment">// read all the keywords, excluding those associated with columns.</span>
table.readAllKeys();
<span class="comment">// print the result.</span>
std::cout << table << std::endl;
<span class="keywordflow">return</span> 0;
}
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