C++中rapidjson将map转为json的方法

Caltha ·

更新时间:2024-09-21

· 590 次阅读

rapidjson将map转为json------人生苦短，我用rapidjson

直接撸代码：


#include <iostream>
#include <map>
// 请自己下载开源的rapidjson
#include "rapidjson/prettywriter.h"
#include "rapidjson/rapidjson.h"
#include "rapidjson/document.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/writer.h"
#include "rapidjson/memorystream.h"
using namespace std;
using rapidjson::Document;
using rapidjson::StringBuffer;
using rapidjson::Writer;
using namespace rapidjson;
string test(const map<string, string> &m)  // 注意这里的const
{
  Document document; 
  Document::AllocatorType& allocator = document.GetAllocator(); 
  Value root(kObjectType); 
  Value key(kStringType); 
  Value value(kStringType); 
 for(map<string, string>::const_iterator it = m.begin(); it != m.end(); ++it) // 注意这里要用const_iterator
 {
 key.SetString(it->first.c_str(), allocator); 
   value.SetString(it->second.c_str(), allocator); 
   root.AddMember(key, value, allocator);
 }
  StringBuffer buffer; 
  Writer<StringBuffer> writer(buffer); 
  root.Accept(writer); 
  return buffer.GetString(); 
} 
int main(int argc, char *argv[])
{
 map<string, string> m;
 m["name"] = "taoge";
 m["place"] = "shenzhen";
 cout << test(m) << endl;
 return 0;
}

结果：

{"name":"taoge","place":"shenzhen"}

来，继续改：


#include <iostream>
#include <map>
// 请自己下载开源的rapidjson
#include "rapidjson/prettywriter.h"
#include "rapidjson/rapidjson.h"
#include "rapidjson/document.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/writer.h"
#include "rapidjson/memorystream.h"
using namespace std;
using rapidjson::Document;
using rapidjson::StringBuffer;
using rapidjson::Writer;
using namespace rapidjson;
string test(const map<string, int> &mInt, const map<string, string> &mString)  // 注意这里的const
{
  Document document; 
  Document::AllocatorType& allocator = document.GetAllocator(); 
  Value root(kObjectType); 
  Value key(kStringType); 
  Value value(kStringType); 
 for(map<string, int>::const_iterator it = mInt.begin(); it != mInt.end(); ++it) // 注意这里要用const_iterator
 {
 key.SetString(it->first.c_str(), allocator); 
   root.AddMember(key, it->second, allocator);
 }
 for(map<string, string>::const_iterator it = mString.begin(); it != mString.end(); ++it) // 注意这里要用const_iterator
 {
 key.SetString(it->first.c_str(), allocator); 
   value.SetString(it->second.c_str(), allocator); 
   root.AddMember(key, value, allocator);
 }
  StringBuffer buffer; 
  Writer<StringBuffer> writer(buffer); 
  root.Accept(writer); 
  return buffer.GetString(); 
} 
int main(int argc, char *argv[])
{
 map<string, int> mInt;
 mInt["age"] = 29;
 mInt["score"] = 80;
 map<string, string> mString;
 mString["name"] = "taoge";
 mString["place"] = "shenzhen";
 cout << test(mInt, mString) << endl;
 return 0;
}

结果：

{"age":29,"score":80,"name":"taoge","place":"shenzhen"}

不多说。

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c+ rapidjson map 方法 C++

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