C++ json解析库demo

// PocoJson.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include <string> #include <assert.h> #include "Poco/JSON/Object.h" #include "Poco/JSON/Parser.h" #include "Poco/JSON/Query.h" #include "Poco/JSON/JSONException.h" #include "Poco/JSON/Stringifier.h" #include "Poco/JSON/DefaultHandler.h" #include "Poco/JSON/Template.h" #include "Poco/Path.h" #include "Poco/Environment.h" #include "Poco/File.h" #include "Poco/FileStream.h" #include "Poco/Glob.h" #include <set> using namespace Poco::JSON; using namespace Poco::Dynamic; void testNullProperty() { std::string json = "{ \"test\" : null }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); assert(object->isNull("test")); Var test = object->get("test"); assert(test.isEmpty()); } void testTrueProperty() { std::string json = "{ \"test\" : true }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.type() == typeid(bool)); bool value = test; assert(value); } void testFalseProperty() { std::string json = "{ \"test\" : false }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.type() == typeid(bool)); bool value = test; assert(!value); } void testNumberProperty() { std::string json = "{ \"test\" : 1969 }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.isInteger()); int value = test; assert(value == 1969); } void testStringProperty() { std::string json = "{ \"test\" : \"value\" }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.isString()); std::string value = test.convert<std::string>(); assert(value.compare("value") == 0); } void testEmptyObject() { std::string json = "{}"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); assert(object->size() == 0); } void testDoubleProperty() { std::string json = "{ \"test\" : 123.45 }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.isNumeric()); double value = test; assert(value == 123.45); } void testDouble2Property() { std::string json = "{ \"test\" : 12e34 }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.isNumeric()); double value = test; assert(value >= 1.99e34 && value <= 12.01e34); } void testDouble3Property() { std::string json = "{ \"test\" : 12e-34 }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.isNumeric()); double value = test; assert(value == 12e-34); } void testObjectProperty() { std::string json = "{ \"test\" : { \"property\" : \"value\" } }"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Object::Ptr)); Object::Ptr object = result.extract<Object::Ptr>(); Var test = object->get("test"); assert(test.type() == typeid(Object::Ptr)); object = test.extract<Object::Ptr>(); test = object->get("property"); assert(test.isString()); std::string value = test.convert<std::string>(); assert(value.compare("value") == 0); } void testEmptyArray() { std::string json = "[]"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Array::Ptr)); Array::Ptr array = result.extract<Array::Ptr>(); assert(array->size() == 0); } void testNestedArray() { std::string json = "[[[[]]]]"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Array::Ptr)); Array::Ptr array = result.extract<Array::Ptr>(); assert(array->size() == 1); } void testNullElement() { std::string json = "[ null ]"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::endl; assert(false); } assert(result.type() == typeid(Array::Ptr)); Array::Ptr array = result.extract<Array::Ptr>(); assert(array->isNull(0)); Var test = array->get(0); assert(test.isEmpty()); } void testTrueElement() { std::string json = "[ true ]"; Parser parser; Var result; try { DefaultHandler handler; parser.setHandler(&handler); parser.parse(json); result = handler.result(); } catch(JSONException& jsone) { std::cout << jsone.message() << std::