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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Libbonobo Reference Manual: BonoboPersistFile</title>
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                  <a href="#libbonobo-bonobo-persist-file.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
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<div class="refentry">
<a name="libbonobo-bonobo-persist-file"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libbonobo-bonobo-persist-file.top_of_page"></a>BonoboPersistFile</span></h2>
<p>BonoboPersistFile — Interface for anything that can save / load itself from a file.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileIOFn" title="BonoboPersistFileIOFn ()">*BonoboPersistFileIOFn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="returnvalue">BonoboPersistFile</span></a> *
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-persist-file.html#bonobo-persist-file-new" title="bonobo_persist_file_new ()">bonobo_persist_file_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="returnvalue">BonoboPersistFile</span></a> *
</td>
<td class="function_name">
<a class="link" href="libbonobo-bonobo-persist-file.html#bonobo-persist-file-construct" title="bonobo_persist_file_construct ()">bonobo_persist_file_construct</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<a name="BonoboPersistFile"></a><div class="refsect1">
<a name="libbonobo-bonobo-persist-file.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile-struct" title="struct BonoboPersistFile">BonoboPersistFile</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileClass" title="BonoboPersistFileClass">BonoboPersistFileClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a class="link" href="libbonobo-bonobo-object.html#BonoboObject">BonoboObject</a>
        <span class="lineart">╰──</span> <a class="link" href="libbonobo-bonobo-persist.html#BonoboPersist">BonoboPersist</a>
            <span class="lineart">╰──</span> BonoboPersistFile
</pre>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.description"></a><h2>Description</h2>
<p>
The PersistFile interface is a useful interface for Bonoboizing
legacy applications, however, for new / correct applications it
is far preferable to implement the <a class="link" href="libbonobo-bonobo-persist-stream.html#BonoboPersistStream"><span class="type">BonoboPersistStream</span></a> interface,
since this will not only result in a nice clean to your application
architecture, but also allow the transparent use of local, remote,
and synthetic streams.
</p>
<p>
This interface works by connecting callbacks to the methods, in
a pretty deprecated fashion, it is probably better nowadays to
simply sub-class the BonoboXObject and override the epv methods.
Either way, after all the caveats here is an example use:
  </p>
<div class="example">
<a name="id-1.7.7.7.3.1"></a><p class="title"><b>Example 25. Persist file implementation</b></p>
<div class="example-contents"><pre class="programlisting">
static gint
load_from_file (BonoboPersistFile *pf,
                const CORBA_char  *filename,
		CORBA_Environment *ev,
                void              *closure)
{
	EogImageData *image_data = closure;
	g_warning ("Load from '%s'", filename);
	return 0; /* Return 0 on success */
}
static gint
save_to_file (BonoboPersistFile *pf,
              const CORBA_char  *filename,
              CORBA_Environment *ev,
              void              *closure)
{
	EogImageData *image_data = closure;
	g_warning ("Save to '%s'", filename);
	return 0; /* Return 0 on success */
}
    </pre></div>
</div>
<p><br class="example-break">
Having implemented the callbacks we then have to register them
and aggregate the interface to our object:
  </p>
<div class="example">
<a name="id-1.7.7.7.3.2"></a><p class="title"><b>Example 26. Aggregating a new PersistFile</b></p>
<div class="example-contents"><pre class="programlisting">
EogImageData *
eog_image_data_construct (EogImageData *image_data)
{
	BonoboObject        *retval;
	BonoboPersistFile   *file;
	file = bonobo_persist_file_new (
		load_from_file, save_to_file, image_data);
	if (file == NULL) {
		bonobo_object_unref (BONOBO_OBJECT (image_data));
		return NULL;
	}
	bonobo_object_add_interface (BONOBO_OBJECT (image_data),
				     BONOBO_OBJECT (file));
	return image_data;
}
    </pre></div>
</div>
<p><br class="example-break">
Note again, that you should be writing a BonoboPersistStream
interface, however if you have already done this you might like
to just have hooks through so that old apps can use the PersistFile
interface:
  </p>
<div class="example">
<a name="id-1.7.7.7.3.3"></a><p class="title"><b>Example 27. Chaining to a <span class="type">PersistStream</span> implementation</b></p>
<div class="example-contents"><pre class="programlisting">
static gint
load_from_file (BonoboPersistFile *pf,
                const CORBA_char  *filename,
		CORBA_Environment *ev,
                void              *closure)
{
	Bonobo_PersistStream ps = closure;
	BonoboStream *stream;
	stream = bonobo_stream_open (
		BONOBO_IO_DRIVER_FS,
		filename, Bonobo_STORAGE_READ,
		0);
	if (!stream)
		return 0;
	.. extract content type from file ...
	Bonobo_PersistStream_load (ps, type, ev);
	return 0; /* Return 0 on success */
}
static gint
save_to_file (BonoboPersistFile *pf,
              const CORBA_char  *filename,
              CORBA_Environment *ev,
              void              *closure)
{
	Bonobo_PersistStream ps = closure;
	BonoboStream *stream;
	stream = bonobo_stream_open (
		BONOBO_IO_DRIVER_FS,
		filename, Bonobo_STORAGE_WRITE | Bonobo_STORAGE_CREATE,
		S_IRUSR | S_IWUSR | S_IRGRP);
	if (!stream)
		return 0;
	.. work out content type we want to save ...
	Bonobo_PersistStream_save (ps, type, ev);
	return 0; /* Return 0 on success */
}
     </pre></div>
</div>
<p><br class="example-break">
  The mime type data can be extracted from gnome-vfs or gnome-mime.
</p>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="BonoboPersistFileIOFn"></a><h3>BonoboPersistFileIOFn ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
<span class="c_punctuation">(</span>*BonoboPersistFileIOFn<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="type">BonoboPersistFile</span></a> *pf</code></em>,
                          <em class="parameter"><code>const <span class="type">CORBA_char</span> *uri</code></em>,
                          <em class="parameter"><code><span class="type">CORBA_Environment</span> *ev</code></em>,
                          <em class="parameter"><code><span class="type">void</span> *closure</code></em>);</pre>
<div class="warning"><p><code class="literal">BonoboPersistFileIOFn</code> is deprecated and should not be used in newly-written code.</p></div>
<p>
</p>
<div class="refsect3">
<a name="id-1.7.7.8.2.6"></a><h4>Returns</h4>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bonobo-persist-file-new"></a><h3>bonobo_persist_file_new ()</h3>
<pre class="programlisting"><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="returnvalue">BonoboPersistFile</span></a> *
bonobo_persist_file_new (<em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileIOFn" title="BonoboPersistFileIOFn ()"><span class="type">BonoboPersistFileIOFn</span></a> load_fn</code></em>,
                         <em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileIOFn" title="BonoboPersistFileIOFn ()"><span class="type">BonoboPersistFileIOFn</span></a> save_fn</code></em>,
                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *iid</code></em>,
                         <em class="parameter"><code><span class="type">void</span> *closure</code></em>);</pre>
<div class="warning"><p><code class="literal">bonobo_persist_file_new</code> is deprecated and should not be used in newly-written code.</p></div>
<p>Creates a BonoboPersistFile object.  The <em class="parameter"><code>load_fn</code></em>
 and <em class="parameter"><code>save_fn</code></em>

parameters might be NULL.  If this is the case, the load and save 
operations are performed by the class load and save methods</p>
<div class="refsect3">
<a name="id-1.7.7.8.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>load_fn</p></td>
<td class="parameter_description"><p>Loading routine</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>save_fn</p></td>
<td class="parameter_description"><p>Saving routine</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>iid</p></td>
<td class="parameter_description"><p>OAF IID of the object this interface is aggregated to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>closure</p></td>
<td class="parameter_description"><p>Data passed to IO routines.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.7.8.3.7"></a><h4>Returns</h4>
<p> the <a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="type">BonoboPersistFile</span></a>.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bonobo-persist-file-construct"></a><h3>bonobo_persist_file_construct ()</h3>
<pre class="programlisting"><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="returnvalue">BonoboPersistFile</span></a> *
bonobo_persist_file_construct (<em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="type">BonoboPersistFile</span></a> *pf</code></em>,
                               <em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileIOFn" title="BonoboPersistFileIOFn ()"><span class="type">BonoboPersistFileIOFn</span></a> load_fn</code></em>,
                               <em class="parameter"><code><a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFileIOFn" title="BonoboPersistFileIOFn ()"><span class="type">BonoboPersistFileIOFn</span></a> save_fn</code></em>,
                               <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *iid</code></em>,
                               <em class="parameter"><code><span class="type">void</span> *closure</code></em>);</pre>
<div class="warning"><p><code class="literal">bonobo_persist_file_construct</code> is deprecated and should not be used in newly-written code.</p></div>
<p>Initializes the BonoboPersistFile object.  The <em class="parameter"><code>load_fn</code></em>
 and <em class="parameter"><code>save_fn</code></em>

parameters might be NULL.  If this is the case, the load and save 
operations are performed by the class load and save methods</p>
<div class="refsect3">
<a name="id-1.7.7.8.4.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>pf</p></td>
<td class="parameter_description"><p>A BonoboPersistFile</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>load_fn</p></td>
<td class="parameter_description"><p>Loading routine</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>save_fn</p></td>
<td class="parameter_description"><p>Saving routine</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>iid</p></td>
<td class="parameter_description"><p>OAF IID of the object this interface is aggregated to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>closure</p></td>
<td class="parameter_description"><p>Data passed to IO routines.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.7.7.8.4.7"></a><h4>Returns</h4>
<p> the <a class="link" href="libbonobo-bonobo-persist-file.html#BonoboPersistFile"><span class="type">BonoboPersistFile</span></a>.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="BonoboPersistFile-struct"></a><h3>struct BonoboPersistFile</h3>
<pre class="programlisting">struct BonoboPersistFile;</pre>
<div class="warning"><p><code class="literal">BonoboPersistFile</code> is deprecated and should not be used in newly-written code.</p></div>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="BonoboPersistFileClass"></a><h3>BonoboPersistFileClass</h3>
<pre class="programlisting">typedef struct {
	BonoboPersistClass parent_class;

	POA_Bonobo_PersistFile__epv epv;

	/* methods */
	int   (*load)             (BonoboPersistFile *ps,
				   const CORBA_char  *uri,
				   CORBA_Environment *ev);

	int   (*save)             (BonoboPersistFile *ps,
				   const CORBA_char  *uri,
				   CORBA_Environment *ev);

	char *(*get_current_file) (BonoboPersistFile *ps,
				   CORBA_Environment *ev);
} BonoboPersistFileClass;
</pre>
<div class="warning"><p><code class="literal">BonoboPersistFileClass</code> is deprecated and should not be used in newly-written code.</p></div>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="libbonobo-bonobo-persist-file.see-also"></a><h2>See Also</h2>
<p>
<a class="link" href="libbonobo-bonobo-persist-stream.html#BonoboPersistStream"><span class="type">BonoboPersistStream</span></a>, <a class="link" href="libbonobo-bonobo-persist.html#BonoboPersist"><span class="type">BonoboPersist</span></a>
</p>
</div>
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