C++版轻量级JSON库 JsonLite是一个Json的C++实现，可以生成和解析JSON

#ifdef WIN32 #define _CRT_SECURE_NO_WARNINGS #include <SDKDDKVer.h> #include <windows.h> #endif #include "JsonLite.h" void Demo() { //parse json string JsonValue json = JsonParser::Parse("{}"); //get items in array for (UINT i = 0, l = json.GetLength(); i < l; ++i) { //way 1 recommend JString string1 = json.GetString(i); int integer1 = json.GetInteger(i); //way 2 JString string2 = json[i]->GetString(); int integer2 = json[i]->GetInteger(); //way 3 JString string3 = json.Get(i)->GetString(); int integer3 = json.Get(i)->GetInteger(); } //get items in object for (UINT i = 0, l = json.GetLength(); i < l; ++i) { JString name = json.GetName(i); //way 1 recommend JString string1 = json.GetString(name); int integer1 = json.GetInteger(name); //way 2 JString string2 = json[name]->GetString(); int integer2 = json[name]->GetInteger(); //way 3 JString string3 = json.Get(name)->GetString(); int integer3 = json.Get(name)->GetInteger(); } //check whether the item exists if (json.Contain("value name")) { //TODO: } //get object item JsonValue obj = json.Get("object item's name"); if (obj) { obj.GetString("value name1"); obj.GetString("value name2"); } //get array item JsonValue ary = json.Get("array item's name"); if (ary) { ary.GetString(0); //first items's index is 0 ary.GetString(1); } } void Print(const char *pFormat, ...) { va_list args; va_start(args, pFormat); vprintf(pFormat, args); puts(""); #ifdef WIN32 //Print to output window va_start(args, pFormat); int len = _vscprintf(pFormat, args); char *buf = new char[len + 3]; { va_start(args, pFormat); vsprintf(buf, pFormat, args); buf[len++] = '\r'; buf[len++] = '\n'; buf[len] = 0; OutputDebugStringA(buf); delete[] buf; } #endif } void TestStringifyObject() { JsonObjectBuilder builder; builder.Set("string", "abc"); builder.Set("integer", 123); builder.Set("double", 3.14); builder.Set("array", JsonArrayBuilder() .Add("item1") .Add("item2")); builder.Set("object", JsonObjectBuilder() .Set("name1", "value1") .Set("name2", "value2")); Print("object: %s", (char*)builder.Build()); } void TestStringifyArray() { JsonArrayBuilder builder; builder.Add("abc"); builder.Add(123); builder.Add(3.14); builder.Add(JsonArrayBuilder() .Add("item1") .Add("item2")); builder.Add(JsonObjectBuilder() .Set("name1", "value1") .Set("name2", "value2")); Print("array: %s", (char*)builder.Build()); } void TestParse() { JsonObjectBuilder builder; builder.Set("string", "abc"); builder.Set("integer", 123); builder.Set("double", 3.14); builder.SetBool("boolean", true); builder.SetNull("null"); builder.Set("array", JsonArrayBuilder() .Add("item1") .Add("item2")); builder.Set("object", JsonObjectBuilder() .Set("name1", "value1") .Set("name2", "value2")); //Print((char*)builder.Build()); JsonValue json = JsonParser::Parse(builder.Build()); for (UINT i = 0, l = json.GetLength(); i < l; ++i) { JString name = json.GetName(i); JString type = json.Get(name)->GetType(); JString value = json.Get(name)->GetString(); Print("Name=[%-7s] Type=[%-7s] StringValue=\"%s\"", (char*)name, (char*)type, (char*)value); } Print(JsonFormater::Format(json, 4)); //4: indent = 4 } int main(int argc, char *argv[]) { TestStringifyObject(); TestStringifyArray(); TestParse(); return 0; }