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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=iso-8859-1"><title>OGR: OGRFeatureDefn Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.1 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="dirs.html"><span>Directories</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>OGRFeatureDefn Class Reference</h1><!-- doxytag: class="OGRFeatureDefn" --><code>#include <<a class="el" href="ogr__feature_8h-source.html">ogr_feature.h</a>></code><p><a href="classOGRFeatureDefn-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#b98552e676127d847582778d70b7e27b">OGRFeatureDefn</a> (const char *pszName=NULL)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#1efe6db724bb1c5fde13e5f3896e4a01">GetName</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#b400f9106e7544ebafa30b1fe59869b1">GetFieldCount</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#43b95ce699bbca73acb453cc959378e7">GetFieldDefn</a> (int i)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#4f7111e4c818f194932795e9c9593258">GetFieldIndex</a> (const char *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#40e681d8464b42f1a1fac655f16ac3dd">AddFieldDefn</a> (<a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">OGRwkbGeometryType </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#81a7dc7ed24fe9f2634bf447d1799e84">GetGeomType</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a0f50b39efbba6559a510d7afcfa5efb">SetGeomType</a> (OGRwkbGeometryType)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#dbe115a21fb8d247f452ba9d7f00a400">Clone</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#2c58c6238242dff3d472faf5e3803922">Reference</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#87a280dd42634206dfbcfc47b1ecfea4">Dereference</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#f28dd34d8e3ceee1cb1ba6798711b4e1">GetReferenceCount</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#75e1424e3ce755d4393f5b42736d13ee">Release</a> ()</td></tr></table><hr><a name="_details"></a><h2>Detailed Description</h2>Definition of a feature class or feature layer.<p>This object contains schema information for a set of OGRFeatures. In table based systems, an <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> is essentially a layer. In more object oriented approaches (such as SF CORBA) this can represent a class of features but doesn't necessarily relate to all of a layer, or just one layer.<p>This object also can contain some other information such as a name, the base geometry type and potentially other metadata.<p>It is reasonable for different translators to derive classes from <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> with additional translator specific information. <p><hr><h2>Constructor & Destructor Documentation</h2><a class="anchor" name="b98552e676127d847582778d70b7e27b"></a><!-- doxytag: member="OGRFeatureDefn::OGRFeatureDefn" ref="b98552e676127d847582778d70b7e27b" args="(const char *pszName=NULL)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">OGRFeatureDefn::OGRFeatureDefn </td> <td>(</td> <td class="paramtype">const char * </td> <td class="paramname"> <em>pszName</em> = <code>NULL</code> </td> <td> ) </td> <td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Constructor<p>The <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> maintains a reference count, but this starts at zero. It is mainly intended to represent a count of OGRFeature's based on this definition.<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#5a8049bf2d58da5381c9350a6159ea6c">OGR_FD_Create()</a>.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>pszName</em> </td><td>the name to be assigned to this layer/class. It does not need to be unique. </td></tr> </table></dl></div></div><p><hr><h2>Member Function Documentation</h2><a class="anchor" name="1efe6db724bb1c5fde13e5f3896e4a01"></a><!-- doxytag: member="OGRFeatureDefn::GetName" ref="1efe6db724bb1c5fde13e5f3896e4a01" args="()" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">const char * OGRFeatureDefn::GetName </td> <td>(</td> <td class="paramname"> </td> <td> ) </td> <td width="100%"><code> [inline]</code></td> </tr> </table></div><div class="memdoc"><p>Get name of this <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a>.<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#20f309bf10e5b76cc083848b710babb8">OGR_FD_GetName()</a>.<p><dl class="return" compact><dt><b>Returns:</b></dt><dd>the name. This name is internal and should not be modified, or freed. </dd></dl></div></div><p><a class="anchor" name="b400f9106e7544ebafa30b1fe59869b1"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldCount" ref="b400f9106e7544ebafa30b1fe59869b1" args="()" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">int OGRFeatureDefn::GetFieldCount </td> <td>(</td> <td class="paramname"> </td> <td> ) </td> <td width="100%"><code> [inline]</code></td> </tr> </table></div><div class="memdoc"><p>Fetch number of fields on this feature.<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#586a14271a457387a2b5c0097a02c8da">OGR_FD_GetFieldCount()</a>. <dl class="return" compact><dt><b>Returns:</b></dt><dd>count of fields. </dd></dl></div></div><p><a class="anchor" name="43b95ce699bbca73acb453cc959378e7"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldDefn" ref="43b95ce699bbca73acb453cc959378e7" args="(int i)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> * OGRFeatureDefn::GetFieldDefn </td> <td>(</td> <td class="paramtype">int </td> <td class="paramname"> <em>iField</em> </td> <td> ) </td> <td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Fetch field definition.<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#484456df86a01284769d0afe3beaa4f6">OGR_FD_GetFieldDefn()</a>.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>iField</em> </td><td>the field to fetch, between 0 and <a class="el" href="classOGRFeatureDefn.html#b400f9106e7544ebafa30b1fe59869b1">GetFieldCount()</a>-1.</td></tr> </table></dl><dl class="return" compact><dt><b>Returns:</b></dt><dd>a pointer to an internal field definition object. This object should not be modified or freed by the application. </dd></dl></div></div><p><a class="anchor" name="4f7111e4c818f194932795e9c9593258"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldIndex" ref="4f7111e4c818f194932795e9c9593258" args="(const char *)" --><div class="memitem"><div class="memproto"> <table class="memname"> <tr> <td class="memname">int OGRFeatureDefn::GetFieldIndex </td> <td>(</td> <td class="paramtype">const char * </td> <td class="paramname"> <em>pszFieldName</em> </td> <td> ) </td> <td width="100%"></td> </tr> </table></div><div class="memdoc"><p>Find field by name.<p>The field index of the first field matching the passed field name (case insensitively) is returned.<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#1e54c3271dce0562209d78ae6eaae330">OGR_FD_GetFieldIndex()</a>.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>pszFieldName</em> </td><td>the field name to search for.</td></tr> </table></dl><dl class="return" compact><dt><b>Returns:</b></dt><dd>the field index, or -1 if no match found. </dd></dl></div></div><p><a class="anchor" name="40e681d8464b42f1a1fac655f16ac3dd"></a><!-- doxytag: member="OGRFeatureDefn::AddFieldDefn" ref="40e681d8464b42f1a1fac655f16ac3dd" args="(OGRFieldDefn *)" --><div class="memitem"><div class="memproto"> <table class="memname">⌨️ 快捷键说明
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