using namespace std;

using namespace cv;

1.读FileStorage

void rFileStorage() {

    FileStorage fs;

    fs.open("d:/datum/test/test.json",

            FileStorage::READ | FileStorage::FORMAT_JSON);

    String sn = (String)fs["strvalue"];

    double dn = (double)fs["doublevalue"];

    Matx33d mat;

    fs["matvalue"] >> mat;

    cout << "matvalue: \n" << mat << endl;

    cout << "doublevalue: " << dn << endl;

    cout << "strvalue: " << sn << endl;

    fs.release();

    qDebug() << "------ read OK------";

}

2.写FileStorage

void wFileStorage() {

    String str = "a random note";

    double d = 999.001;

    Matx33d mat = {1, 2, 3, 4, 5, 6, 7, 8, 9};

    FileStorage fs;

    fs.open("d:/datum/test/test.json", FileStorage::WRITE | FileStorage::FORMAT_JSON);

    fs << "matvalue" << mat;

    fs << "doublevalue" << d;

    fs << "strvalue" << str;

    fs.release();

    qDebug() << "------write OK------";

}

3.JSON文件

{
“matvalue”: {
“type_id”: “opencv-matrix”,
“rows”: 3,
“cols”: 3,
“dt”: “d”,
“data”: [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 ]
},
“doublevalue”: 9.9900099999999998e+02,
“strvalue”: “a random note”
}

原文地址：http://www.cnblogs.com/zdt168/p/16860155.html