opencv下XML 文件的读写 很全滴

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<span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);">Opencv 存储和读取XML文件使用 FileStorage 类，对于不同的数据结构，存储和读取的方式不同，下面结合例子具体分析下。</span>

头文件

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#include "opencv2/core/core.hpp"

#include <iostream>

#include <string>

#include <vector>

存储XML的代码结构

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FileStorage fs(“name.xml”, FileStorage::WRITE); //创建XML文件



if (!fs.isOpened())

{

cerr << "failed to open " << filename << endl;

}

/******************************/

/* 存储数据 */

/******************************/

fs.release();

一、一般数据的存储

1. int型数据（float, string, float 等数据类型相同）

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int num;

fs["Num"]<<num;

2. vector 数据

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vector<int> data;

for(int i=0; i<5; i++)

data.push_back(i);



fs<<"VECTOR"<<"["; // 注意要有中括号

for(vector<int>::iterator it =data.begin(); it!= data.begin(); it++)

{

fs<<(*it);

}

fs<<"]";

3. Map 数据读取

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map<string, int> data;

data.insert(map<string,int>::value_type("one", 1));

data.insert(map<string,int>::value_type("two", 2));



fs<<"MAP"<<"{";//注意要用到大括号

for(map<string,int>::iterator it = data.begin(); it!= data.end(); it++)

{

fs<<it->first<<it->second;

}

fs<<"}";

4. Opencv 中矩阵数据的存储

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Mat R = Mat_::eye(3,3);

fs<<"Mat"<<R;

二、一般数据的读取

首先需要打开XML文件

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FileStorage fs("name.xml", FileStorage::READ);



if (!fs.isOpened())

{

cerr << "failed to open " << filename << endl;

}

1. int型数据（float, string, float 等数据类型相同）

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int Num = fs["Num"];

//or

fs["Num"]>>Num;

2. vector 数据

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FileNode n = fs["VECOTR"];

if(n.type()!= FileNode::SEQ)

{

cerr<<"VECTOR is not a sequence! FAIL"<<endl;

}

for(FileNodeIterator it = n.begin(); it!=n.end(); it++)

{

cout<< *it<<endl;

}

3. Map数据

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FileNode n = fs["MAP"];

cout<<"one"<< (int)n["one"]<<endl;

cout<<"two"<< (int)n["two"]<<endl;

4. Opencv 中矩阵数据的存储

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Mat R= fs["MAT"];

三、自定义数据的存储与读取

1、首先需要先定义一个数据结构

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class MyData{

public:

MyaData()A(0){ B.clear();}

MyData(int k, Mat& m)

{

A =k;

B = m;

for(int i=0; i<A;++)

{

B.push_back(i);

}

}



int A;

vector<float> B;

Mat R;



// 定义存储函数，注意末尾处的const，缺少会出现错误

void write(FileStorage &fs) const

{

fs<<"{";//必须要有大括号

fs<<"A"<<A; //存储A

fs<<"B"<<"["; // 存储B

for(vector<float>::iterator it = B.begin(); it!=B.end(); it++)

{

fs<<(*it);

}

fs<<"]";

fs<<"R"<<R; //存储R

fs<<"}";

}

// 定义读取函数的数据

void read( FileStorage & node)

{

// 读取A

int A = node["A"];



// 读取B

FileNode n = node["B"];



if(n.type()!=cv::FileNode::SEQ)

{

cerr<<"B is not a sequence! FAIL"<<endl;

}



for(cv::FileNodeIterator it = n.begin(); it!= n.end(); it++)

cout<<(int)(*it)<<endl;



// 读取R

Mat R = node["R"];



}



};

2、定义完数据结构后需要重载两个函数

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static void write(FileStorage& fs, const std::string&, const MyData& x){

x.write(fs);

}

static void read(const FileNode& node, MyData& x, const MyData& default_value = MyData()){

if(node.empty())

x = default_value;

else

x.read(node);

}

3. 对自定义的数据惊醒存储和读取

存储

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int num = 2;

Mat R = Mat_::eye(3,3);

MyData mydata(2, R);

fs<<"MYDATA"<<mydata;

读取

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MyData *mydata = new MyData();

fs["MYDATA"]>> (*mydata);

转自 ：http://blog.csdn.net/Sway_2012/article/details/23381135