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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Varargs Value Collection: GObject Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GObject Reference Manual"> <link rel="up" href="rn01.html" title="API Reference"> <link rel="prev" href="gobject-GParamSpec.html" title="GParamSpec"> <link rel="next" href="gobject-Signals.html" title="Signals"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#gobject-Varargs-Value-Collection.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="rn01.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="gobject-GParamSpec.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="gobject-Signals.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="gobject-Varargs-Value-Collection"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="gobject-Varargs-Value-Collection.top_of_page"></a>Varargs Value Collection</span></h2> <p>Varargs Value Collection — Converting varargs to generic values</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()">G_VALUE_COLLECT_INIT</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()">G_VALUE_COLLECT</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-SKIP:CAPS" title="G_VALUE_COLLECT_SKIP()">G_VALUE_COLLECT_SKIP</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-LCOPY:CAPS" title="G_VALUE_LCOPY()">G_VALUE_LCOPY</a><span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="GTypeCValue">GTypeCValue</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS" title="G_VALUE_COLLECT_FORMAT_MAX_LENGTH">G_VALUE_COLLECT_FORMAT_MAX_LENGTH</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib-object.h> #include <gobject/gvaluecollector.h> </pre> </div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.description"></a><h2>Description</h2> <p>The macros in this section provide the varargs parsing support needed in variadic GObject functions such as <a class="link" href="gobject-The-Base-Object-Type.html#g-object-new" title="g_object_new ()"><code class="function">g_object_new()</code></a> or <a class="link" href="gobject-The-Base-Object-Type.html#g-object-set" title="g_object_set ()"><code class="function">g_object_set()</code></a>. They currently support the collection of integral types, floating point types and pointers.</p> </div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="G-VALUE-COLLECT-INIT:CAPS"></a><h3>G_VALUE_COLLECT_INIT()</h3> <pre class="programlisting">#define G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error)</pre> <p>Collects a variable argument value from a va_list. We have to implement the varargs collection as a macro, because on some systems va_list variables cannot be passed by reference.</p> <div class="refsect3"> <a name="G-VALUE-COLLECT-INIT.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" 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>value</p></td> <td class="parameter_description"><p>a <a class="link" href="gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> must contain only 0 bytes.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>_value_type</p></td> <td class="parameter_description"><p>the <a class="link" href="gobject-Type-Information.html#GType"><span class="type">GType</span></a> to use for <em class="parameter"><code>value</code></em> .</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>var_args</p></td> <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>flags</p></td> <td class="parameter_description"><p>flags which are passed on to the <code class="function">collect_value()</code> function of the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> .</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>__error</p></td> <td class="parameter_description"><p>a <span class="type">gchar</span>** variable that will be modified to hold a <code class="function">g_new()</code> allocated error messages if something fails</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p> </div> <hr> <div class="refsect2"> <a name="G-VALUE-COLLECT:CAPS"></a><h3>G_VALUE_COLLECT()</h3> <pre class="programlisting">#define G_VALUE_COLLECT(value, var_args, flags, __error)</pre> <p>Collects a variable argument value from a va_list. We have to implement the varargs collection as a macro, because on some systems va_list variables cannot be passed by reference.</p> <p>Note: If you are creating the <em class="parameter"><code>value</code></em> argument just before calling this macro, you should use the <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()"><span class="type">G_VALUE_COLLECT_INIT</span></a> variant and pass the unitialized <a class="link" href="gobject-Generic-values.html#GValue"><span class="type">GValue</span></a>. That variant is faster than <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><span class="type">G_VALUE_COLLECT</span></a>.</p> <div class="refsect3"> <a name="G-VALUE-COLLECT.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" 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>value</p></td> <td class="parameter_description"><p>a <a class="link" href="gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> is supposed to be initialized according to the value type to be collected</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>var_args</p></td> <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>flags</p></td> <td class="parameter_description"><p>flags which are passed on to the <code class="function">collect_value()</code> function of the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> .</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>__error</p></td> <td class="parameter_description"><p>a <span class="type">gchar</span>** variable that will be modified to hold a <code class="function">g_new()</code> allocated error messages if something fails</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="G-VALUE-COLLECT-SKIP:CAPS"></a><h3>G_VALUE_COLLECT_SKIP()</h3> <pre class="programlisting">#define G_VALUE_COLLECT_SKIP(_value_type, var_args)</pre> <p>Skip an argument of type <em class="parameter"><code>_value_type</code></em> from <em class="parameter"><code>var_args</code></em> .</p> <div class="refsect3"> <a name="G-VALUE-COLLECT-SKIP.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" 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>_value_type</p></td> <td class="parameter_description"><p>the <a class="link" href="gobject-Type-Information.html#GType"><span class="type">GType</span></a> of the value to skip</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>var_args</p></td> <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="G-VALUE-LCOPY:CAPS"></a><h3>G_VALUE_LCOPY()</h3> <pre class="programlisting">#define G_VALUE_LCOPY(value, var_args, flags, __error)</pre> <p>Stores a value’s value into one or more argument locations from a va_list. This is the inverse of <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><code class="function">G_VALUE_COLLECT()</code></a>.</p> <div class="refsect3"> <a name="G-VALUE-LCOPY.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" 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>value</p></td> <td class="parameter_description"><p>a <a class="link" href="gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> to store into the <em class="parameter"><code>var_args</code></em> ; this must be initialized and set</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>var_args</p></td> <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>flags</p></td> <td class="parameter_description"><p>flags which are passed on to the <code class="function">lcopy_value()</code> function of the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> .</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>__error</p></td> <td class="parameter_description"><p>a <span class="type">gchar</span>** variable that will be modified to hold a <code class="function">g_new()</code> allocated error message if something fails</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> </div> </div> <div class="refsect1"> <a name="gobject-Varargs-Value-Collection.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GTypeCValue"></a><h3>GTypeCValue</h3> <p>A union holding one collected value.</p> <div class="refsect3"> <a name="GTypeCValue.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="union_members_name"> <col class="union_members_description"> <col width="200px" class="union_members_annotations"> </colgroup> <tbody> <tr> <td class="union_member_name"><p><span class="type">gint</span> <em class="structfield"><code><a name="GTypeCValue.v-int"></a>v_int</code></em>;</p></td> <td class="union_member_description"><p>the field for holding integer values</p></td> <td class="union_member_annotations"> </td> </tr> <tr> <td class="union_member_name"><p><span class="type">glong</span> <em class="structfield"><code><a name="GTypeCValue.v-long"></a>v_long</code></em>;</p></td> <td class="union_member_description"><p>the field for holding long integer values</p></td> <td class="union_member_annotations"> </td> </tr> <tr> <td class="union_member_name"><p><span class="type">gint64</span> <em class="structfield"><code><a name="GTypeCValue.v-int64"></a>v_int64</code></em>;</p></td> <td class="union_member_description"><p>the field for holding 64 bit integer values</p></td> <td class="union_member_annotations"> </td> </tr> <tr> <td class="union_member_name"><p><span class="type">gdouble</span> <em class="structfield"><code><a name="GTypeCValue.v-double"></a>v_double</code></em>;</p></td> <td class="union_member_description"><p>the field for holding floating point values</p></td> <td class="union_member_annotations"> </td> </tr> <tr> <td class="union_member_name"><p><span class="type">gpointer</span> <em class="structfield"><code><a name="GTypeCValue.v-pointer"></a>v_pointer</code></em>;</p></td> <td class="union_member_description"><p>the field for holding pointers</p></td> <td class="union_member_annotations"> </td> </tr> </tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS"></a><h3>G_VALUE_COLLECT_FORMAT_MAX_LENGTH</h3> <pre class="programlisting">#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8) </pre> <p>The maximal number of <span class="type">GTypeCValues</span> which can be collected for a single <a class="link" href="gobject-Generic-values.html#GValue"><span class="type">GValue</span></a>.</p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>