1、示例的json格式

2、测试代码

使用的版本jsonjson_0.10.7

void test_video_list() 
{ 
    Json::Value root; 
    Json::Value calss_info; 
    Json::FastWriter writer; 
    Json::Value PointInfo; 
     
    char* device = "device"; 
    char* status = "status"; 
 
    root[device]      = "test1";   /* key值可以用char*或直接是字符串常量 */ 
    root[status]      = "0"; 
    root["total_num"] = "2"; 
 
    calss_info["seq"] = "1"; 
    calss_info["class_addr"]="rtmp://192.168.1.252/test/chan1"; 
    calss_info["class_info"]["class"] = "氧化反应1"; 
    calss_info["class_info"]["section"] = "高中"; 
    calss_info["class_info"]["grade"]      = "高一"; 
    calss_info["class_info"]["teacher"]    = "陈海"; 
    calss_info["class_info"]["subject"]    = "化学"; 
     
    PointInfo["seq"]  = "1"; 
    PointInfo["time"] = "5825"; 
    PointInfo["dsc"]  ="开始试验1"; 
    calss_info["class_info"]["time_info"].append(PointInfo); 
 
    PointInfo["seq"]  = "2"; 
    PointInfo["time"] = "19825"; 
    PointInfo["dsc"]  ="开始试验2"; 
    calss_info["class_info"]["time_info"].append(PointInfo); 
     
    root["video_list"].append(calss_info);          /* 数组内再添加数组 */ 
 
    calss_info.clear();   /* 清空之前的结点信息 */ 
     
    calss_info["seq"] = "2"; 
    calss_info["class_addr"]="rtmp://192.168.1.252/test/chan2"; 
    calss_info["class_info"]["class"] = "氧化反应2"; 
    calss_info["class_info"]["section"] = "高中"; 
    calss_info["class_info"]["grade"]      = "高一"; 
    calss_info["class_info"]["teacher"]    = "陈海"; 
    calss_info["class_info"]["subject"]    = "化学"; 
    root["video_list"].append(calss_info); 
 
    string data = writer.write(root); 
    cout << "data: " << data <<endl;            /* 字符串格式输出 */ 
 
    int list_size = root["video_list"].size(); 
         
    //cout << root["video_list"].toStyledString() << endl; 
    cout << root.toStyledString() << endl; 
    cout << "list_size: " << list_size << endl; 
     
    /* 获取第一层数组 */ 
    for(int i = 0; i < list_size; ++i) 
    { 
        cout << "class_addr: " << root["video_list"][i]["class_addr"].asString() << endl; 
        cout << "class_info size: " << root["video_list"][i]["class_info"].size() <<endl; 
        cout << "class: " << root["video_list"][i]["class_info"]["class"].asString() <<endl; 
        cout << "section_id: " << root["video_list"][i]["class_info"]["section_id"].asString() <<endl; 
 
        cout << "time info size: " << root["video_list"][i]["class_info"]["time_info"].size() << endl; 
        cout <<  root["video_list"][i]["class_info"]["time_info"].toStyledString() << endl; 
         
        /* 获取数组内的数组 */ 
        for(int j = 0; j < root["video_list"][i]["class_info"]["time_info"].size(); ++j) 
        { 
            //point_info.seq        = root["video_list"][i]["class_info"]["time_info"][j]["seq"].asInt(); 
            cout <<  root["video_list"][i]["class_info"]["time_info"][j]["time"].asString() << endl; 
            //unsigned int time = lexical_cast<int>(root["video_list"][i]["class_info"]["time_info"][j]["time"].asString()); 
            //cout <<  root["video_list"][i]["class_info"]["time_info"][j]["dsc"].asString() << endl; 
        } 
    } 
} 

3、获取json的名称

void JsonCPP_test() 
{ 
    Json::Reader read; 
    Json::Value test_value; 
     
    test_value["device"] = "testdev"; 
 
    Json::Value GradeValue, SubjectValue, SectionValue; 
    //GradeValue["grade"].append("一年级"); 
    //GradeValue["grade"].append("二年级"); 
    const char* grade = "grade"; 
 
    test_value["catalog"][grade].append("一年级"); 
    test_value["catalog"]["grade"].append("二年级"); 
    test_value["catalog"]["subject"].append("小学"); 
    test_value["catalog"]["subject"].append("初中"); 
     
    //if(read.parse(strValue, test_value, false)) 
    cout << test_value.toStyledString() << endl; 
    int array_size = test_value["catalog"].size(); 
    cout << "array_size: " << array_size << endl; 
     
    int i = 0; 
    int j = 0; 
    int catalog_size = test_value["catalog"].size(); 
 
    vector<string> root_name = test_value.getMemberNames(); 
    for(int i = 0; i < root_name.size();++i) 
    { 
        cout << "root_name: " << root_name[i] << endl; 
    } 
 
    vector<string> name = test_value["catalog"].getMemberNames(); 
    for(int i = 0; i < name.size();++i) 
    { 
        cout << "name: " << name[i] << endl; 
    } 
 
    /* 解析年级。一年级、二年级 */ 
    for(; j < catalog_size; ++j) 
    { 
        for(; i < test_value["catalog"][name[j]].size(); ++i) 
        { 
            cout << test_value["catalog"][name[j]][i].asString() << endl; 
        } 
    } 
}