[整理][RapidJson用法2]C++之RapidJson创建嵌套数组json

原创文章，转载请注明： 转载自勤奋的小青蛙
本文链接地址: [整理][RapidJson用法2]C++之RapidJson创建嵌套数组json

本文继续上篇博文的研究：http://www.jyguagua.com/?p=2469

上篇博文里我通过RapidJson解析了嵌套的json文本，那么本文章是RapidJson创建嵌套数组Json文本。

代码：

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include <iostream>

using namespace rapidjson;
int main() {
    // 1. Parse a JSON string into DOM.
    const char* json ="{\"Info\":[{\"lots\":10,\"order_algorithm\":\"01\",\"buy_close\":9000,\"spread_shift\":0,\"position_b_sell\":0,\"position_a_buy_today\":0,\"position_a_buy_yesterday\":0,\"sell_open\":-9000,\"list_instrument_id\":[\"rb1705\",\"rb1701\"],\"position_b_buy_today\":0,\"buy_open\":-9000,\"position_a_sell_yesterday\":0,\"strategy_id\":\"02\",\"position_b_buy\":0,\"a_wait_price_tick\":1,\"trade_model\":\"boll_reversion\",\"b_wait_price_tick\":0,\"sell_close\":9000,\"only_close\":0,\"order_action_limit\":400,\"is_active\":1,\"lots_batch\":1,\"position_a_sell\":0,\"position_b_buy_yesterday\":0,\"user_id\":\"063802\",\"position_a_buy\":0,\"trader_id\":\"1601\",\"position_a_sell_today\":0,\"stop_loss\":0,\"position_b_sell_today\":0,\"position_b_sell_yesterday\":0,\"on_off\":0},{\"lots\":20,\"order_algorithm\":\"02\",\"buy_close\":9000,\"spread_shift\":0,\"position_b_sell\":0,\"position_a_buy_today\":0,\"position_a_buy_yesterday\":0,\"sell_open\":-9000,\"list_instrument_id\":[\"ni1705\",\"ni1701\"],\"position_b_buy_today\":0,\"buy_open\":-9000,\"position_a_sell_yesterday\":0,\"strategy_id\":\"01\",\"position_b_buy\":0,\"a_wait_price_tick\":1,\"trade_model\":\"boll_reversion\",\"b_wait_price_tick\":0,\"sell_close\":9000,\"only_close\":0,\"order_action_limit\":400,\"is_active\":1,\"lots_batch\":1,\"position_a_sell\":0,\"position_b_buy_yesterday\":0,\"user_id\":\"063802\",\"position_a_buy\":0,\"trader_id\":\"1601\",\"position_a_sell_today\":0,\"stop_loss\":0,\"position_b_sell_today\":0,\"position_b_sell_yesterday\":0,\"on_off\":0}],\"MsgSendFlag\":0,\"MsgErrorReason\":\"IDorpassworderror\",\"MsgRef\":1,\"MsgType\":3,\"MsgResult\":0}";
    //std::cout << json << std::endl;
	//std::cout << "\n" << std::endl;
	std::cout << "|==================|" << std::endl;
	std::cout << "||rapidjson output||" << std::endl;
	std::cout << "|==================|" << std::endl;
	Document doc;
	doc.SetObject();
	rapidjson::Document::AllocatorType& allocator = doc.GetAllocator();
	
	doc.AddMember("MsgSendFlag", 1, allocator);
	doc.AddMember("MsgErrorReason", "IDorpassworderror", allocator);
	doc.AddMember("MsgRef", 1, allocator);
	
    rapidjson::Value info_array(rapidjson::kArrayType);
	
	for (int i = 0; i < 2; i++) {
		rapidjson::Value info_object(rapidjson::kObjectType);
		info_object.SetObject();
		info_object.AddMember("lots", 10 + i, allocator);
		info_object.AddMember("order_algorithm", "01", allocator);
		
		rapidjson::Value instrument_array(rapidjson::kArrayType);
		for (int j = 0; j < 2; j++) {
			rapidjson::Value instrument_object(rapidjson::kObjectType);
			instrument_object.SetObject();
			instrument_object.SetString("cu1701");
			instrument_array.PushBack(instrument_object, allocator);
		}
		
		info_object.AddMember("list_instrument_id", instrument_array, allocator);
		info_array.PushBack(info_object, allocator);
		
	}
	
	doc.AddMember("Info", info_array, allocator);
	
	
    // 3. Stringify the DOM
    StringBuffer buffer;
    Writer<StringBuffer> writer(buffer);
    doc.Accept(writer);
    std::cout << buffer.GetString() << std::endl;
    return 0;
}

运行效果所创建的JSON文本为：

{
  "MsgSendFlag": 1,
  "MsgErrorReason": "IDorpassworderror",
  "MsgRef": 1,
  "Info": [
    {
      "lots": 10,
      "order_algorithm": "01",
      "list_instrument_id": [
        "cu1701",
        "cu1701"
      ]
    },
    {
      "lots": 11,
      "order_algorithm": "01",
      "list_instrument_id": [
        "cu1701",
        "cu1701"
      ]
    }
  ]
}

其JSON格式化视图如下：