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A lightweight library for parsing, generating, and formatting json written in C++
chenxuan
All code is included in the json.h header file, and all functions can be used by including this header file
The source code is about 1000 lines, including parsing, generating and formatting json data
Support the use of // and /**/ as comments
Very easy to use. Short hands-on time
You can generate json directly like go through {}, which is very convenient
//create tree for json text
Json json(file.getFileBuff(temp));//file.getFileBuff(temp) is const char*
if(json.lastError()!=NULL)
{
printf("%s\n",json.lastError());
return ;
}
// find the key value
auto root=json.getRootObj();//get the result
if(root["empt"]!=Json::npos)
for(unsigned i=0;i<root["empt"].arr.size();i++)
printf("%f\n",root["empt"][i].floVal);
if(root["first Name"]!=Json::npos)
printf("%s\n",root["first Name"].strVal.c_str());
if(root["ept"]["ko"]!=Json::npos)
printf("ept:ko:%lf\n",root["ept"]["ko"].floVal);
Get the parsed object first, then use [] to get the result
The array types are all object types, which can be obtained through .
if there is no result the return value is Json::npos
//create a new json text
Json::Node node={{"status","ok"}};
auto node=json.createObject({{"status","ok"},{"arr",{1,2,3,4}},{"strarr",{"we","lpl"}}} );
Objects can be initialized directly through {}
json itself is a node object, you can use the node method to add key-value pairs
node["stdStr"]=string("koko");//Add string
node["strOld"]="ok";
node["null"]=nullptr;//Add null type
node["bool"]=true;//Add bool type
node["Int"]=1000;//Add int
node["double"]=1.43;//Add double
printf("node:\n%s\n",node());
Both C type and C++ string type can be added directly
Useless [] because the analysis of json data uses []
//Add an object, you can create another node to add or directly {}
node["nodeself"]=node;
node["obj"]={
{"status","ok"},
{"vector",vector<string>()={"chenxuan","is","winner"}}
};
//C type array
const char* oldStr[]={"asdf","nkjn"};
auto arrOld=json.createArray(oldStr,2);
//or Json::Node temp(oldStr,2);
json["arrold"]=arrOld;
//C++ type
node["arrarr"]=vector<vector<int>>()={{1,2,3},{4,5,6}};
node["boolArr"]=vector<bool>()={true,false};
The array of C needs to call createArray, or generate a node again
The vector type can be added directly. Vector supports up to two dimensions. If it exceeds two dimensions, you need to create a node array before adding it.
Json json2={
{"float",12.3},
{"int",23},
{"bool",true},
{"str","string"},
{"null",nullptr},
{"stdstr",string("chenxuan")},
{"arrFloat",{2.3,8.9,2.3}},
{"arrBool",{true,false}},
{"arrStr",{{"chenxuan","create"},{"lover","xiaozhu"}}},
{"node",node},
{"arrVec",arrFlo}
};
printf("json2:\n%s \n",json2());
The way to get the result is ()
const char* result=json.formatPrint(json.getRootObj());
printf("%s\n",result);//json.getRootObj is get the root of create
Does not support json array types such as [1, "dad", true], because the addition of such arrays is complicated and not used much, ~~ too lazy to support~~
Because it has just been developed, 100% compatibility cannot be guaranteed after subsequent improvements (as compatible as possible)
Limited technology will inevitably lead to bugs, you can raise issues, and must be carefully revised
If you like this project, you can give a ⭐
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