Json文档中数组使用

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背景：

需要对Json文档按照特定字段进行提取，而在同一个字段下存在json对象数组。

代码：

<pre name="code" class="cpp">string filename = "JsonData.txt";ifstream infile(filename.c_str());ofstream Outfile("Jdataresult.txt");Json::Reader reader;Json::Value ReadData;string oneline;Outfile<<"hashape"<<'\t'<<"hash3"<<'\t'<<"hash1"<<'\t'<<"hash"<<'\t'<<"hash_f"<<'\t'<<"scid"<<'\t'<<name1"<<'\t'<<"name2"<<endl;while(getline(infile, oneline)){if(!reader.parse(oneline, ReadData)){return;}Json::Value subclass = ReadData["data"];//该字段的内容是个矩阵，而矩阵也是json对象。<span style="display: none; width: 0px; height: 0px;" id="transmark"></span>int jsonsize = subclass.size();cout<<"任务数："<<jsonsize<<endl;for(int i=0; i<jsonsize; ++i){string hashape = subclass[i]["hash_ape"].asString();string hash3 = subclass[i]["hash_3"].asString();string hash1 = subclass[i]["hash_1"].asString();string hash = subclass[i]["hash"].asString();string hash_f = subclass[i]["hash_f"].asString();int scid = subclass[i]["scid"].asInt();string name1 = subclass[i]["name1"].asString();string name2 = subclass[i]["name2"].asString();Outfile<<hashape<<'\t'<<hash3<<'\t'<<hash1<<'\t'<<hash<<'\t'<<hash_f<<'\t'<<Uint32ToString(scid)<<'\t'<<name1<<'\t'<<name2<<endl;}}Outfile.close();

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