Đó là ví dụ của tôi trong Qt C ++. Qt hỗ trợ XPath 2.0:
QString planePath = ":/Models/Plane.dae";
QFile f(planePath);
if (!f.open(QIODevice::ReadOnly))
{
std::cerr << "Failed to load the file: " <<
planePath.toStdString() << std::endl;
return;
}
QXmlQuery query;
query.bindVariable("myFile", &f);
// query.setQuery("doc($myFile)//*[local-name() = 'p']/text()"); // it works too but it is XPath 1.0
query.setQuery("doc($myFile)//*:p/text()");
QString result;
query.evaluateTo(&result);
qDebug() << result;
f.close();
Đầu ra chương trình: "1 0 0 2 0 1 0 0 2 1 0 3 3 0 4 2 0 5\n"
Plane.dae
<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<asset>
<contributor>
<author>Blender User</author>
<authoring_tool>Blender 2.83.3 commit date:2020-07-22, commit time:06:01, hash:353e5bd7493e</authoring_tool>
</contributor>
<created>2020-08-03T14:03:19</created>
<modified>2020-08-03T14:03:19</modified>
<unit name="meter" meter="1"/>
<up_axis>Z_UP</up_axis>
</asset>
<library_effects>
<effect id="PlaneMaterial-effect">
<profile_COMMON>
<technique sid="common">
<lambert>
<emission>
<color sid="emission">0 0 0 1</color>
</emission>
<diffuse>
<color sid="diffuse">0.01664001 0.8000001 0.01191879 1</color>
</diffuse>
<reflectivity>
<float sid="specular">0.5</float>
</reflectivity>
</lambert>
</technique>
</profile_COMMON>
</effect>
</library_effects>
<library_images/>
<library_materials>
<material id="PlaneMaterial-material" name="PlaneMaterial">
<instance_effect url="#PlaneMaterial-effect"/>
</material>
</library_materials>
<library_geometries>
<geometry id="Plane-mesh" name="Plane">
<mesh>
<source id="Plane-mesh-positions">
<float_array id="Plane-mesh-positions-array" count="12">-1 -1 0 1 -1 0 -1 1 0 1 1 0</float_array>
<technique_common>
<accessor source="#Plane-mesh-positions-array" count="4" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<source id="Plane-mesh-normals">
<float_array id="Plane-mesh-normals-array" count="3">0 0 1</float_array>
<technique_common>
<accessor source="#Plane-mesh-normals-array" count="1" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<source id="Plane-mesh-map-0">
<float_array id="Plane-mesh-map-0-array" count="12">1 0 0 1 0 0 1 0 1 1 0 1</float_array>
<technique_common>
<accessor source="#Plane-mesh-map-0-array" count="6" stride="2">
<param name="S" type="float"/>
<param name="T" type="float"/>
</accessor>
</technique_common>
</source>
<vertices id="Plane-mesh-vertices">
<input semantic="POSITION" source="#Plane-mesh-positions"/>
</vertices>
<triangles material="PlaneMaterial-material" count="2">
<input semantic="VERTEX" source="#Plane-mesh-vertices" offset="0"/>
<input semantic="NORMAL" source="#Plane-mesh-normals" offset="1"/>
<input semantic="TEXCOORD" source="#Plane-mesh-map-0" offset="2" set="0"/>
<p>1 0 0 2 0 1 0 0 2 1 0 3 3 0 4 2 0 5</p>
</triangles>
</mesh>
</geometry>
</library_geometries>
<library_visual_scenes>
<visual_scene id="Scene" name="Scene">
<node id="Plane" name="Plane" type="NODE">
<matrix sid="transform">1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1</matrix>
<instance_geometry url="#Plane-mesh" name="Plane">
<bind_material>
<technique_common>
<instance_material symbol="PlaneMaterial-material" target="#PlaneMaterial-material">
<bind_vertex_input semantic="UVMap" input_semantic="TEXCOORD" input_set="0"/>
</instance_material>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>
<scene>
<instance_visual_scene url="#Scene"/>
</scene>
</COLLADA>