使用C++解析XML文件

       該xml文件爲labelImg.exe生成，通過C++獲取到該文件中的標籤名字與位置，然後保存到容器中供後續方便調用。

1、下載庫tinyxml；

2、將tinyxml.h、tinystr.h、tinystr.cpp、tinyxml.cpp、tinyxmlerror.cpp、tinyxmlparser.cpp這6個文件拷貝到工程下；

3、引入兩個頭文件，#include "tinystr.h"，#include "tinyxml.h"；

#include <iostream>
#include <opencv.hpp>
#include <fstream>
#include <vector>
#include <map>
#include <string>
#include "tinystr.h"
#include "tinyxml.h"

using namespace std;
using namespace cv;

typedef vector<pair<std::string, cv::Rect>> vecNameLoc;
vecNameLoc m_boltCentRects, m_boltCheckRects;
vecNameLoc m_boardCheckRects, m_posTemplRects, m_angleTemplRects, m_maskTemplRects;
typedef map<std::string, cv::Rect> mapNameLoc;
mapNameLoc m_mapTemplRectsImg;
mapNameLoc m_mapTemplRectsMain;

int readLabelFromXML(string path)
{
    TiXmlDocument doc;//申明一個文檔類型變量，用來存儲讀取的xml文檔
    if (!doc.LoadFile(path.c_str()))   //檢測xml文檔是否存在
    {
        cerr << doc.ErrorDesc() << endl;
    }
    TiXmlElement* annotation = doc.FirstChildElement();//指向xml文檔的根元素
    if (annotation == NULL)//檢測根元素存在性     
    {
        cerr << "Failed to load file: No root element." << endl;
        doc.Clear();
        return -1;
    }
    TiXmlElement* object = annotation->FirstChildElement(); // xml的id 根節點下第一個子節點
	object = object->NextSiblingElement("object");
    while (object != NULL)
    {
        TiXmlElement* nameElement = object->FirstChildElement();
        string name = nameElement->GetText();
        TiXmlElement* bndbox = nameElement->NextSiblingElement("bndbox");
        TiXmlElement* xmin = bndbox->FirstChildElement();
        string xminValue = xmin->GetText();
        TiXmlElement* ymin = xmin->NextSiblingElement();
        string yminValue = ymin->GetText();
        TiXmlElement* xmax = ymin->NextSiblingElement();
        string xmaxValue = xmax->GetText();
        TiXmlElement* ymax = xmax->NextSiblingElement();
        string ymaxValue = ymax->GetText();
        Rect rect(Point(stoi(xminValue), stoi(yminValue)), Point(stoi(xmaxValue), stoi(ymaxValue)));
        m_mapTemplRectsImg[name] = rect;
        m_mapTemplRectsMain[name] = rect;
		if (name.find("pos") != string::npos && name.find("pos_net") == string::npos)
		{
			m_posTemplRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else if (name.find("angle") != string::npos || name.find("rot") != string::npos)
		{
			m_angleTemplRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else if (name.find("board") != string::npos || name.find("sim") != string::npos || name.find("plate") != string::npos)
		{
			m_boardCheckRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else if (name.find("bolt") != string::npos && name.find("checkbolt") == string::npos)
		{
			m_boltCentRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else if (name.find("checkbolt") != string::npos)
		{
			m_boltCheckRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else if (name.find("mask") != string::npos)
		{
			m_maskTemplRects.push_back(std::pair<string, cv::Rect>(name, rect));
		}
		else
		{
			if (name.find("power") != string::npos)
			{
				continue;
			}
		}
		object = object->NextSiblingElement("object");
    }
	//按名稱排序
	std::sort(m_boltCentRects.begin(), m_boltCentRects.end(), [](auto v1, auto v2) {return v1.first < v2.first; });
	std::sort(m_boltCheckRects.begin(), m_boltCheckRects.end(), [](auto v1, auto v2) {return v1.first < v2.first; });
	return 0;
}

int main()
{
	readLabelFromXML("test.xml");
	return 0;
}

<annotation>
	<folder>XXX</folder>
	<filename>XXX.png</filename>
	<path>D:/XXX.png</path>
	<source>
		<database>Unknown</database>
	</source>
	<size>
		<width>2309</width>
		<height>4647</height>
		<depth>1</depth>
	</size>
	<segmented>0</segmented>
	<object>
		<name>pos_rear_cam</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>190</xmin>
			<ymin>205</ymin>
			<xmax>572</xmax>
			<ymax>547</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_key_up</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>2087</xmin>
			<ymin>1011</ymin>
			<xmax>2168</xmax>
			<ymax>1356</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_key_down</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>2093</xmin>
			<ymin>1426</ymin>
			<xmax>2176</xmax>
			<ymax>1771</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_screen_b5</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>128</xmin>
			<ymin>3044</ymin>
			<xmax>178</xmax>
			<ymax>3136</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_screw_l_down</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>912</xmin>
			<ymin>4516</ymin>
			<xmax>953</xmax>
			<ymax>4594</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_lighting</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>997</xmin>
			<ymin>4525</ymin>
			<xmax>1282</xmax>
			<ymax>4597</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_motor</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>929</xmin>
			<ymin>3849</ymin>
			<xmax>2039</xmax>
			<ymax>4149</ymax>
		</bndbox>
	</object>
	<object>
		<name>board_main_1</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>218</xmin>
			<ymin>752</ymin>
			<xmax>777</xmax>
			<ymax>1383</ymax>
		</bndbox>
	</object>
	<object>
		<name>board_main_3</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>197</xmin>
			<ymin>2339</ymin>
			<xmax>467</xmax>
			<ymax>2784</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_mic</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>594</xmin>
			<ymin>281</ymin>
			<xmax>667</xmax>
			<ymax>399</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_checknet_l</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>377</xmin>
			<ymin>4537</ymin>
			<xmax>803</xmax>
			<ymax>4605</ymax>
		</bndbox>
	</object>
	<object>
		<name>pos_checknet_r</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>1483</xmin>
			<ymin>4534</ymin>
			<xmax>1913</xmax>
			<ymax>4598</ymax>
		</bndbox>
	</object>
	<object>
		<name>bolt_b1</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>1893</xmin>
			<ymin>609</ymin>
			<xmax>1928</xmax>
			<ymax>641</ymax>
		</bndbox>
	</object>
	<object>
		<name>checkbolt_b2</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>1321</xmin>
			<ymin>577</ymin>
			<xmax>1420</xmax>
			<ymax>671</ymax>
		</bndbox>
	</object>
	<object>
		<name>checkbolt_b3</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>921</xmin>
			<ymin>579</ymin>
			<xmax>1019</xmax>
			<ymax>674</ymax>
		</bndbox>
	</object>
	<object>
		<name>checkbolt_b4</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>181</xmin>
			<ymin>609</ymin>
			<xmax>273</xmax>
			<ymax>699</ymax>
		</bndbox>
	</object>

</annotation>