C++中rapidjson将map转为json的方法
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。
总结
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