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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#GypsyPosition.synopsis" class="shortcut">Top</a>
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<a href="#GypsyPosition.description" class="shortcut">Description</a>
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<a href="#GypsyPosition.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#GypsyPosition.properties" class="shortcut">Properties</a>
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<a href="#GypsyPosition.signals" class="shortcut">Signals</a>
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<div class="refentry" title="GypsyPosition">
<a name="GypsyPosition"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GypsyPosition.top_of_page"></a>GypsyPosition</span></h2>
<p>GypsyPosition — Object for obtaining positions from gypsy-daemon</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="GypsyPosition.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
<a class="link" href="GypsyPosition.html#GypsyPosition-struct" title="GypsyPosition">GypsyPosition</a>;
#define <a class="link" href="GypsyPosition.html#GYPSY-POSITION-DBUS-INTERFACE--CAPS" title="GYPSY_POSITION_DBUS_INTERFACE">GYPSY_POSITION_DBUS_INTERFACE</a>
#define <a class="link" href="GypsyPosition.html#GYPSY-POSITION-DBUS-SERVICE--CAPS" title="GYPSY_POSITION_DBUS_SERVICE">GYPSY_POSITION_DBUS_SERVICE</a>
enum <a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields">GypsyPositionFields</a>;
<a class="link" href="GypsyPosition.html" title="GypsyPosition">GypsyPosition</a> * <a class="link" href="GypsyPosition.html#gypsy-position-new" title="gypsy_position_new ()">gypsy_position_new</a> (const char *object_path);
<a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields">GypsyPositionFields</a> <a class="link" href="GypsyPosition.html#gypsy-position-get-position" title="gypsy_position_get_position ()">gypsy_position_get_position</a> (<a class="link" href="GypsyPosition.html" title="GypsyPosition">GypsyPosition</a> *position,
int *timestamp,
double *latitude,
double *longitude,
double *altitude,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"
>GError</a> **error);
</pre>
</div>
<div class="refsect1" title="Object Hierarchy">
<a name="GypsyPosition.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a
href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"
>GObject</a>
+----GypsyPosition
</pre>
</div>
<div class="refsect1" title="Properties">
<a name="GypsyPosition.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GypsyPosition.html#GypsyPosition--object-path" title='The "object-path" property'>object-path</a>" <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"
>gchar</a>* : Write / Construct Only
</pre>
</div>
<div class="refsect1" title="Signals">
<a name="GypsyPosition.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GypsyPosition.html#GypsyPosition-position-changed" title='The "position-changed" signal'>position-changed</a>" : Run First / No Recursion
</pre>
</div>
<div class="refsect1" title="Description">
<a name="GypsyPosition.description"></a><h2>Description</h2>
<p>
<a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a> is used whenever the client program wishes to know about
GPS position changes. It can report the current position, and has a signal
to notify listeners of changes.
</p>
<p>
A <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a> object is created using <a class="link" href="GypsyPosition.html#gypsy-position-new" title="gypsy_position_new ()"><code class="function">gypsy_position_new()</code></a> using the
D-Bus path of the GPS device. This path is returned from the
<a class="link" href="GypsyControl.html#gypsy-control-create" title="gypsy_control_create ()"><code class="function">gypsy_control_create()</code></a> function. The client can then find out about the
position with <a class="link" href="GypsyPosition.html#gypsy-position-get-position" title="gypsy_position_get_position ()"><code class="function">gypsy_position_get_position()</code></a>.
</p>
<p>
As the position information changes <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a> will emit the
position-changed signal. This signal contains the fix position if
gypsy-daemon knows it. It has a fields paramater which is a bitmask of
<a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields"><span class="type">GypsyPositionFields</span></a> which indicates which of the latitude, longitude or
altitude contains valid information. The timestamp will always be valid
if it is greater than 0.
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
GypsyPosition *position;
GError *error = NULL;
. . .
/ * path comes from the gypsy_control_create() function * /
position = gypsy_position_new (path);
g_signal_connect (position, "position-changed", G_CALLBACK (position_changed), NULL);
. . .
static void position_changed (GypsyPosition *position,
GypsyPositionFields fields,
int timestamp,
double latitude,
double longitude,
double altitude,
gpointer userdata)
{
g_print ("latitude, longitude (%f, %f)\n", (fields & GYPSY_POSITION_FIELDS_LATITUDE) ? latitude : -1.0, (fields & GYPSY_POSITION_FIELDS_LONGITUDE) ? longitude : -1.0);
}
</pre></div>
<p>
</p>
</div>
<div class="refsect1" title="Details">
<a name="GypsyPosition.details"></a><h2>Details</h2>
<div class="refsect2" title="GypsyPosition">
<a name="GypsyPosition-struct"></a><h3>GypsyPosition</h3>
<pre class="programlisting">typedef struct _GypsyPosition GypsyPosition;</pre>
<p>
There are no public fields in <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a>.</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" title="GYPSY_POSITION_DBUS_INTERFACE">
<a name="GYPSY-POSITION-DBUS-INTERFACE--CAPS"></a><h3>GYPSY_POSITION_DBUS_INTERFACE</h3>
<pre class="programlisting">#define GYPSY_POSITION_DBUS_INTERFACE "org.freedesktop.Gypsy.Position"
</pre>
<p>
A define containing the name of the Position interface</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" title="GYPSY_POSITION_DBUS_SERVICE">
<a name="GYPSY-POSITION-DBUS-SERVICE--CAPS"></a><h3>GYPSY_POSITION_DBUS_SERVICE</h3>
<pre class="programlisting">#define GYPSY_POSITION_DBUS_SERVICE "org.freedesktop.Gypsy"
</pre>
<p>
A define containing the address of the Position service</p>
<p>
</p>
</div>
<hr>
<div class="refsect2" title="enum GypsyPositionFields">
<a name="GypsyPositionFields"></a><h3>enum GypsyPositionFields</h3>
<pre class="programlisting">typedef enum {
GYPSY_POSITION_FIELDS_NONE = 0,
GYPSY_POSITION_FIELDS_LATITUDE = 1 << 0,
GYPSY_POSITION_FIELDS_LONGITUDE = 1 << 1,
GYPSY_POSITION_FIELDS_ALTITUDE = 1 << 2
} GypsyPositionFields;
</pre>
<p>
A bitmask telling which fields in the position_changed callback are valid</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GYPSY-POSITION-FIELDS-NONE--CAPS"></a><span class="term"><code class="literal">GYPSY_POSITION_FIELDS_NONE</code></span></p></td>
<td> None of the fields are valid
</td>
</tr>
<tr>
<td><p><a name="GYPSY-POSITION-FIELDS-LATITUDE--CAPS"></a><span class="term"><code class="literal">GYPSY_POSITION_FIELDS_LATITUDE</code></span></p></td>
<td> The latitude field is valid
</td>
</tr>
<tr>
<td><p><a name="GYPSY-POSITION-FIELDS-LONGITUDE--CAPS"></a><span class="term"><code class="literal">GYPSY_POSITION_FIELDS_LONGITUDE</code></span></p></td>
<td> The longitude field is valid
</td>
</tr>
<tr>
<td><p><a name="GYPSY-POSITION-FIELDS-ALTITUDE--CAPS"></a><span class="term"><code class="literal">GYPSY_POSITION_FIELDS_ALTITUDE</code></span></p></td>
<td> The altitude field is valid
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gypsy_position_new ()">
<a name="gypsy-position-new"></a><h3>gypsy_position_new ()</h3>
<pre class="programlisting"><a class="link" href="GypsyPosition.html" title="GypsyPosition">GypsyPosition</a> * gypsy_position_new (const char *object_path);</pre>
<p>
Creates a new <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a> object that listens for position changes
from the GPS found at <em class="parameter"><code>object_path</code></em>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_path</code></em> :</span></p></td>
<td> Object path to the GPS device
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> A <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a> object
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gypsy_position_get_position ()">
<a name="gypsy-position-get-position"></a><h3>gypsy_position_get_position ()</h3>
<pre class="programlisting"><a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields">GypsyPositionFields</a> gypsy_position_get_position (<a class="link" href="GypsyPosition.html" title="GypsyPosition">GypsyPosition</a> *position,
int *timestamp,
double *latitude,
double *longitude,
double *altitude,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"
>GError</a> **error);</pre>
<p>
Obtains the current position, if known, from the GPS device.
<em class="parameter"><code>timestamp</code></em>, <em class="parameter"><code>latitude</code></em>, <em class="parameter"><code>longitude</code></em> and <em class="parameter"><code>altitude</code></em> can be <a
href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL--CAPS"
><span class="type">NULL</span></a> if the result
is not required.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td> A <a class="link" href="GypsyPosition.html" title="GypsyPosition"><span class="type">GypsyPosition</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td> Pointer to store the timestamp
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>latitude</code></em> :</span></p></td>
<td> Pointer to store the latitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>longitude</code></em> :</span></p></td>
<td> Pointer to store the longitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>altitude</code></em> :</span></p></td>
<td> Pointer to store the altitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td> Pointer to store a <a
href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"
><span class="type">GError</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Bitmask of <a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields"><span class="type">GypsyPositionFields</span></a> indicating what field was set
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" title="Property Details">
<a name="GypsyPosition.property-details"></a><h2>Property Details</h2>
<div class="refsect2" title='The "object-path" property'>
<a name="GypsyPosition--object-path"></a><h3>The <code class="literal">"object-path"</code> property</h3>
<pre class="programlisting"> "object-path" <a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"
>gchar</a>* : Write / Construct Only</pre>
<p>
The path of the Gypsy GPS object</p>
<p>
</p>
<p>Default value: ""</p>
</div>
</div>
<div class="refsect1" title="Signal Details">
<a name="GypsyPosition.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2" title='The "position-changed" signal'>
<a name="GypsyPosition-position-changed"></a><h3>The <code class="literal">"position-changed"</code> signal</h3>
<pre class="programlisting">void user_function (<a class="link" href="GypsyPosition.html" title="GypsyPosition">GypsyPosition</a> *fields,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"
>gint</a> timestamp,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"
>gint</a> latitude,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"
>gdouble</a> longitude,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"
>gdouble</a> altitude,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"
>gdouble</a> arg5,
<a
href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"
>gpointer</a> user_data) : Run First / No Recursion</pre>
<p>
The ::position-changed signal is emitted when the GPS device
indicates that one or more of the position fields has changed.
The fields which have changed will be indicated in the <em class="parameter"><code>fields</code></em>
bitmask.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>fields</code></em> :</span></p></td>
<td> A bitmask of <a class="link" href="GypsyPosition.html#GypsyPositionFields" title="enum GypsyPositionFields"><span class="type">GypsyPositionFields</span></a> indicating which of the following fields are valid
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td> The timestamp when this change occurred
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>latitude</code></em> :</span></p></td>
<td> The new latitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>longitude</code></em> :</span></p></td>
<td> The new longitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>altitude</code></em> :</span></p></td>
<td> The new altitude
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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