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gnome-chemistry-utils-devel-0.10.8-3mdv2010.0.i586.rpm

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<h1>gcu::Loader Class Reference</h1><!-- doxytag: class="gcu::Loader" -->
<p>class used to implement serialization engines.  
<a href="#_details">More...</a></p>

<p><code>#include &lt;<a class="el" href="loader_8h_source.html">gcu/loader.h</a>&gt;</code></p>

<p><a href="classgcu_1_1Loader-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#a69799b1df7ba819a59923023886a1ce6">Loader</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#a7fd44366c449021558b3dffa7157aef3">~Loader</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#ac7bf5f4ede3bfd9be1390e7cf949d140">Read</a> (<a class="el" href="classgcu_1_1Document.html">Document</a> *doc, GsfInput *in, char const *mime_type, IOContext *io)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#acee683aa2f1b76dea9e793dc1f609413">Write</a> (<a class="el" href="classgcu_1_1Document.html">Document</a> *doc, GsfOutput *out, char const *mime_type, IOContext *io)</td></tr>
<tr><td colspan="2"><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#aeccea675f75e66a6aa930ec92bfb624c">Init</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#aeef5ea41aacf0f7b95ac3c965737535b">GetFirstLoader</a> (std::map&lt; std::string, <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> &gt;::iterator &amp;it)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#ad2ad56c39863ec7b82959b79b9479303">GetNextLoader</a> (std::map&lt; std::string, <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> &gt;::iterator &amp;it)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classgcu_1_1Loader.html">Loader</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#aa77a287a17dee7ec63008b8cbaaf195d">GetLoader</a> (char const *mime_type)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classgcu_1_1Loader.html">Loader</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#a53c5dba360861091155b645c9db83b32">GetSaver</a> (char const *mime_type)</td></tr>
<tr><td colspan="2"><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#ac972a854361fe7430a7cd7b2cf2bab57">AddMimeType</a> (const char *mime_type)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#a5d75ed95d04deae7a80e21e958c5f27d">RemoveMimeType</a> (const char *mime_type)</td></tr>
<tr><td colspan="2"><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">std::list&lt; std::string &gt;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgcu_1_1Loader.html#af8b3620a51ddd6ee9359b57e4d26cb65">MimeTypes</a></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>class used to implement serialization engines. </p>
<p>This class is used to load and save files of various types, using the <a class="el" href="classgcu_1_1Object.html">gcu::Object</a> framework. Derived classes should be implemented in plugins, using the goffice plugins API. When <a class="el" href="classgcu_1_1Loader.html#aeccea675f75e66a6aa930ec92bfb624c">Loader::Init</a> is called, the framework collects informations about the services exposed by each plugin in XML files. For the CDX file loader plugin, the corresponding plugin.xml.in file content is:</p>
<div class="fragment"><pre class="fragment">&lt;?xml version=<span class="stringliteral">&quot;1.0&quot;</span> encoding=<span class="stringliteral">&quot;UTF-8&quot;</span>?&gt;
&lt;plugin <span class="keywordtype">id</span>=<span class="stringliteral">&quot;GCULoader_cdxml&quot;</span>&gt;
        &lt;information&gt;
                &lt;_name&gt;<a class="code" href="classgcu_1_1Loader.html#a69799b1df7ba819a59923023886a1ce6">Loader</a> : cdxml&lt;/_name&gt;
                &lt;_description&gt;Chemdraw XML files loader.&lt;/_description&gt;
        &lt;/information&gt;
        &lt;loader type=<span class="stringliteral">&quot;Gnumeric_Builtin:module&quot;</span>&gt;
                &lt;attribute name=<span class="stringliteral">&quot;module_file&quot;</span> value=<span class="stringliteral">&quot;cdxml&quot;</span>/&gt;
        &lt;/loader&gt;
        &lt;services&gt;
                &lt;service type=<span class="stringliteral">&quot;chemical_loader&quot;</span> <span class="keywordtype">id</span>=<span class="stringliteral">&quot;GCULoader_cdxml&quot;</span>&gt;
                        &lt;mime_type name=<span class="stringliteral">&quot;chemical/x-cdxml&quot;</span> capabilities=<span class="stringliteral">&quot;r&quot;</span> scope=<span class="stringliteral">&quot;2&quot;</span>/&gt;
                        &lt;information&gt;
                                &lt;_description&gt;Chemdraw XML files loader&lt;/_description&gt;
                        &lt;/information&gt;
                &lt;/service&gt;
        &lt;/services&gt;
&lt;/plugin&gt;
</pre></div><p>In the present context, the important node is the mime type related one. Its attributes are:</p>
<ul>
<li>name: the mime type.</li>
<li>capabilities: what is supported: r for reading, w for writing. Both "rw" and "wr" are valid.</li>
<li>scope: 2 and 3 mean 2D and 3D structures, repectively, c means crystal structure, and s, spectra . Any combination might be used.</li>
</ul>
<p>Other fields are standard in the goffice world. The plugin is loaded only when needed.</p>
<p>Each plugin should implement at least one derived class and a static instance of this class. The CDX loader has:</p>
<div class="fragment"><pre class="fragment"><span class="keyword">class </span>CDXLoader: <span class="keyword">public</span> gcu::<a class="code" href="classgcu_1_1Loader.html#a69799b1df7ba819a59923023886a1ce6">Loader</a>
{
<span class="keyword">public</span>:
        CDXLoader ();
        <span class="keyword">virtual</span> ~CDXLoader ();

        <span class="keywordtype">bool</span> <a class="code" href="classgcu_1_1Loader.html#ac7bf5f4ede3bfd9be1390e7cf949d140">Read</a> (Document *doc, GsfInput *in, <span class="keywordtype">char</span> <span class="keyword">const</span> *mime_type, IOContext *io);
        <span class="keywordtype">bool</span> <a class="code" href="classgcu_1_1Loader.html#acee683aa2f1b76dea9e793dc1f609413">Write</a> (Document *doc, GsfOutput *out, <span class="keywordtype">char</span> <span class="keyword">const</span> *mime_type, IOContext *io);

<span class="keyword">private</span>:
        ...
};

...
static CDXLoader loader;
</pre></div> 
<p>Definition at line <a class="el" href="loader_8h_source.html#l00147">147</a> of file <a class="el" href="loader_8h_source.html">loader.h</a>.</p>
<hr/><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" id="a69799b1df7ba819a59923023886a1ce6"></a><!-- doxytag: member="gcu::Loader::Loader" ref="a69799b1df7ba819a59923023886a1ce6" args="()" -->
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          <td class="memname">gcu::Loader::Loader </td>
          <td>(</td>
          <td class="paramname"></td>
          <td>&nbsp;)&nbsp;</td>
          <td></td>
        </tr>
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<p>The constructor. Derived class need to call <a class="el" href="classgcu_1_1Loader.html#ac972a854361fe7430a7cd7b2cf2bab57">Loader::AddMimeType</a> for each mime type they support. </p>

</div>
</div>
<a class="anchor" id="a7fd44366c449021558b3dffa7157aef3"></a><!-- doxytag: member="gcu::Loader::~Loader" ref="a7fd44366c449021558b3dffa7157aef3" args="()" -->
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          <td class="memname">virtual gcu::Loader::~Loader </td>
          <td>(</td>
          <td class="paramname"></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [virtual]</code></td>
        </tr>
      </table>
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<div class="memdoc">
<p>The destructor Derived class should call <a class="el" href="classgcu_1_1Loader.html#a5d75ed95d04deae7a80e21e958c5f27d">Loader::RemoveMimeType</a> for each mime type they support. </p>

</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="ac972a854361fe7430a7cd7b2cf2bab57"></a><!-- doxytag: member="gcu::Loader::AddMimeType" ref="ac972a854361fe7430a7cd7b2cf2bab57" args="(const char *mime_type)" -->
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          <td class="memname">void gcu::Loader::AddMimeType </td>
          <td>(</td>
          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [protected]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>a mime type.</td></tr>
  </table>
  </dd>
</dl>
<p>Registers a mime type and stores the instance calling it as the <a class="el" href="classgcu_1_1Loader.html" title="class used to implement serialization engines.">Loader</a> for this mime type. </p>

</div>
</div>
<a class="anchor" id="aeef5ea41aacf0f7b95ac3c965737535b"></a><!-- doxytag: member="gcu::Loader::GetFirstLoader" ref="aeef5ea41aacf0f7b95ac3c965737535b" args="(std::map&lt; std::string, LoaderStruct &gt;::iterator &amp;it)" -->
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          <td class="memname">static bool gcu::Loader::GetFirstLoader </td>
          <td>(</td>
          <td class="paramtype">std::map&lt; std::string, <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> &gt;::iterator &amp;&nbsp;</td>
          <td class="paramname"> <em>it</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
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<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>it</em>&nbsp;</td><td>a std::map iterator.</td></tr>
  </table>
  </dd>
</dl>
<p>Must be called to access the first <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> instance. When successful the iterator can be used to retrieve both the mime type ((*it).first), and the corresponding <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> ((*it).second) </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if successful, false otherwise. </dd></dl>

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</div>
<a class="anchor" id="aa77a287a17dee7ec63008b8cbaaf195d"></a><!-- doxytag: member="gcu::Loader::GetLoader" ref="aa77a287a17dee7ec63008b8cbaaf195d" args="(char const *mime_type)" -->
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          <td class="memname">static <a class="el" href="classgcu_1_1Loader.html">Loader</a>* gcu::Loader::GetLoader </td>
          <td>(</td>
          <td class="paramtype">char const *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
        </tr>
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<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>a mime type. </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the <a class="el" href="classgcu_1_1Loader.html" title="class used to implement serialization engines.">Loader</a> instance able to read the mime type if any. </dd></dl>

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</div>
<a class="anchor" id="ad2ad56c39863ec7b82959b79b9479303"></a><!-- doxytag: member="gcu::Loader::GetNextLoader" ref="ad2ad56c39863ec7b82959b79b9479303" args="(std::map&lt; std::string, LoaderStruct &gt;::iterator &amp;it)" -->
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          <td class="memname">static bool gcu::Loader::GetNextLoader </td>
          <td>(</td>
          <td class="paramtype">std::map&lt; std::string, <a class="el" href="structgcu_1_1LoaderStruct.html">LoaderStruct</a> &gt;::iterator &amp;&nbsp;</td>
          <td class="paramname"> <em>it</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
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      </table>
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<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>it</em>&nbsp;</td><td>a std::map iterator initialized by <a class="el" href="classgcu_1_1Loader.html#aeef5ea41aacf0f7b95ac3c965737535b">Loader::GetFirstLoader</a></td></tr>
  </table>
  </dd>
</dl>
<p>Gets the next LoderStruct and its associated mime type. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if successful, false otherwise. </dd></dl>

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<a class="anchor" id="a53c5dba360861091155b645c9db83b32"></a><!-- doxytag: member="gcu::Loader::GetSaver" ref="a53c5dba360861091155b645c9db83b32" args="(char const *mime_type)" -->
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          <td class="memname">static <a class="el" href="classgcu_1_1Loader.html">Loader</a>* gcu::Loader::GetSaver </td>
          <td>(</td>
          <td class="paramtype">char const *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
        </tr>
      </table>
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<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>a mime type. </td></tr>
  </table>
  </dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the <a class="el" href="classgcu_1_1Loader.html" title="class used to implement serialization engines.">Loader</a> instance able to write the mime type if any. </dd></dl>

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<a class="anchor" id="aeccea675f75e66a6aa930ec92bfb624c"></a><!-- doxytag: member="gcu::Loader::Init" ref="aeccea675f75e66a6aa930ec92bfb624c" args="()" -->
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          <td class="memname">static void gcu::Loader::Init </td>
          <td>(</td>
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          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
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<p>Initializes the load/save engines system. This must be called before trying to use any loader (no one will be available before, anyway). </p>

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<a class="anchor" id="ac7bf5f4ede3bfd9be1390e7cf949d140"></a><!-- doxytag: member="gcu::Loader::Read" ref="ac7bf5f4ede3bfd9be1390e7cf949d140" args="(Document *doc, GsfInput *in, char const *mime_type, IOContext *io)" -->
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          <td class="memname">virtual bool gcu::Loader::Read </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classgcu_1_1Document.html">Document</a> *&nbsp;</td>
          <td class="paramname"> <em>doc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">GsfInput *&nbsp;</td>
          <td class="paramname"> <em>in</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">char const *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">IOContext *&nbsp;</td>
          <td class="paramname"> <em>io</em></td><td>&nbsp;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [virtual]</code></td>
        </tr>
      </table>
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<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>doc</em>&nbsp;</td><td>the <a class="el" href="classgcu_1_1Document.html">gcu::Document</a> being read. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>in</em>&nbsp;</td><td>a GsfInput (see the libgsf documentation at <a href="http://library.gnome.org/devel/gsf/stable/gsf-Input-from-unstructured-files.html#GsfInput">http://library.gnome.org/devel/gsf/stable/gsf-Input-from-unstructured-files.html#GsfInput</a>). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>the mime type of the data. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>io</em>&nbsp;</td><td>a GOffice IOContext.</td></tr>
  </table>
  </dd>
</dl>
<p>This function must be overloaded by a derived class able to read. Default implementation just return false. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true on success, false otherwise. </dd></dl>

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</div>
<a class="anchor" id="a5d75ed95d04deae7a80e21e958c5f27d"></a><!-- doxytag: member="gcu::Loader::RemoveMimeType" ref="a5d75ed95d04deae7a80e21e958c5f27d" args="(const char *mime_type)" -->
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          <td class="memname">void gcu::Loader::RemoveMimeType </td>
          <td>(</td>
          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em></td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [protected]</code></td>
        </tr>
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<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>a mime type.</td></tr>
  </table>
  </dd>
</dl>
<p>Unregisters a mime type. </p>

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<a class="anchor" id="acee683aa2f1b76dea9e793dc1f609413"></a><!-- doxytag: member="gcu::Loader::Write" ref="acee683aa2f1b76dea9e793dc1f609413" args="(Document *doc, GsfOutput *out, char const *mime_type, IOContext *io)" -->
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          <td class="memname">virtual bool gcu::Loader::Write </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classgcu_1_1Document.html">Document</a> *&nbsp;</td>
          <td class="paramname"> <em>doc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">GsfOutput *&nbsp;</td>
          <td class="paramname"> <em>out</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">char const *&nbsp;</td>
          <td class="paramname"> <em>mime_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">IOContext *&nbsp;</td>
          <td class="paramname"> <em>io</em></td><td>&nbsp;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [virtual]</code></td>
        </tr>
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<div class="memdoc">
<dl><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>doc</em>&nbsp;</td><td>the <a class="el" href="classgcu_1_1Document.html">gcu::Document</a> being written. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>out</em>&nbsp;</td><td>a GsfOutput (see the libgsf documentation at <a href="http://library.gnome.org/devel/gsf/stable/gsf-Output-to-unstructured-files.html#GsfOutput">http://library.gnome.org/devel/gsf/stable/gsf-Output-to-unstructured-files.html#GsfOutput</a>). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>mime_type</em>&nbsp;</td><td>the mime type of the data. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>io</em>&nbsp;</td><td>a GOffice IOContext.</td></tr>
  </table>
  </dd>
</dl>
<p>This function must be overloaded by a derived class able to write. Default implementation just return false. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true on success, false otherwise. </dd></dl>

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<hr/><h2>Member Data Documentation</h2>
<a class="anchor" id="af8b3620a51ddd6ee9359b57e4d26cb65"></a><!-- doxytag: member="gcu::Loader::MimeTypes" ref="af8b3620a51ddd6ee9359b57e4d26cb65" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">std::list&lt;std::string&gt; <a class="el" href="classgcu_1_1Loader.html#af8b3620a51ddd6ee9359b57e4d26cb65">gcu::Loader::MimeTypes</a><code> [protected]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">
<p>The list of supported mime types. </p>

<p>Definition at line <a class="el" href="loader_8h_source.html#l00241">241</a> of file <a class="el" href="loader_8h_source.html">loader.h</a>.</p>

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</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="loader_8h_source.html">loader.h</a></li>
</ul>
</div>
<hr size="1"/><address style="text-align: right;"><small>Generated on Sun Sep 6 18:33:55 2009 for The Gnome Chemistry Utils by&nbsp;
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