C++ json解决方案
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前段时间用到C++来封装com 因此从数据转换上我采用的Json来当两种语言的传递方式，现做下json的序列化与反序列化方案的总结：
Rapidjson
文档地址：http://rapidjson.org/zh-cn/
使用体会：比C# 现有的各类Json库相比调用麻烦需要特别清楚整体结构。
序列化代码：
rapidjson::Document jsonDoc;
rapidjson::Document::AllocatorType &allocator = jsonDoc.GetAllocator(); //获取分配器
jsonDoc.SetArray();
for(int i=0;i< facesPoint.size();i++)
{
Value faceArray(kObjectType);
Value jawArray(kArrayType);
for(int j=0;j<facesPoint[i].jaw.size();j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].jaw[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].jaw[j].Y, allocator);
jawArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("jaw", jawArray, allocator);
Value leftBroArray(kArrayType);
for (int j = 0; j<facesPoint[i].leftBrow.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].leftBrow[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].leftBrow[j].Y, allocator);
leftBroArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("leftBrow", leftBroArray, allocator);
Value leftEyeArray(kArrayType);
for (int j = 0; j<facesPoint[i].leftEye.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].leftEye[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].leftEye[j].Y, allocator);
leftEyeArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("leftEye", leftEyeArray, allocator);
Value mouthArray(kArrayType);
for (int j = 0; j<facesPoint[i].mouth.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].mouth[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].mouth[j].Y, allocator);
mouthArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("mouth", mouthArray, allocator);
Value mouth2Array(kArrayType);
for (int j = 0; j<facesPoint[i].mouth2.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].mouth2[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].mouth2[j].Y, allocator);
mouth2Array.PushBack(pointobj, allocator);
}
faceArray.AddMember("mouth2", mouth2Array, allocator);
Value noseArray(kArrayType);
for (int j = 0; j<facesPoint[i].nose.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].nose[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].nose[j].Y, allocator);
noseArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("nose", noseArray, allocator);
Value rightBrowArray(kArrayType);
for (int j = 0; j<facesPoint[i].rightBrow.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].rightBrow[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].rightBrow[j].Y, allocator);
rightBrowArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("rightBrow", rightBrowArray, allocator);
Value rightEyeArray(kArrayType);
for (int j = 0; j<facesPoint[i].rightEye.size(); j++)
{
Value pointobj(kObjectType);
pointobj.AddMember("x", facesPoint[i].rightEye[j].X, allocator);
pointobj.AddMember("y", facesPoint[i].rightEye[j].Y, allocator);
rightEyeArray.PushBack(pointobj, allocator);
}
faceArray.AddMember("rightEye", rightEyeArray, allocator);
jsonDoc.PushBack(faceArray, allocator);
}
rapidjson::StringBuffer buffer;
rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
jsonDoc.Accept(writer);
JSON for Modern C++
文档地址：https://github.com/nlohmann/json
使用体会：目前为止找到比较简单粗暴的json解决方案代码也简单易懂
序列化前必要的模版声明
namespace NaughtyKidFaceRectangle
{
struct FaceRectangle
{
public:
double top;
double bottom;
double left;
double right;
double width;
double height;
FaceRectangle() {};
FaceRectangle(double _top, double _bottom, double _left, double _right, double _width, double _height)
{
top = _top;
bottom = _bottom;
left = _left;
right = _right;
width = _width;
height = _height;
}
};
inline void to_json(nlohmann::json& j, const FaceRectangle& p)
{
j = nlohmann::json
{
{"top", p.top},
{ "bottom", p.bottom} ,
{ "left", p.left },
{ "right", p.right },
{ "width", p.width },
{ "height", p.height }
};
}
inline void from_json(const nlohmann::json& j, FaceRectangle& p)
{
p.top = j.at("top").get<double>();
p.bottom = j.at("bottom").get<double>();
p.left = j.at("left").get<double>();
p.right = j.at("right").get<double>();
p.width = j.at("width").get<double>();
p.height = j.at("height").get<double>();
}
}
namespace NaughtyKid
{
struct NaughtyKidPoint
{
public:
NaughtyKidPoint() {};
NaughtyKidPoint(double _x, double _y) { x = _x; y = _y; }
NaughtyKidPoint(double _x, double _y, int _index) { x = _x; y = _y; index = _index; }
double x;
double y;
int index;
};
void to_json(nlohmann::json& j, const NaughtyKidPoint& p) {
j = nlohmann::json{
{
"x", p.x
},{ "y", p.y } ,{"index",p.index}};
}
void from_json(const nlohmann::json& j, NaughtyKidPoint& p) {
p.x = j.at("x").get<double>();
p.y = j.at("y").get<double>();
p.index = j.at("index").get<double>();
}
}
using namespace NaughtyKid;
namespace dlib_face
{
struct dlib_face
{
public:
std::vector<NaughtyKidPoint> jaw; //下巴
std::vector<NaughtyKidPoint> rightBrow; //右眉毛
std::vector<NaughtyKidPoint> leftBrow; //左眉毛
std::vector<NaughtyKidPoint> nose; //鼻子
std::vector<NaughtyKidPoint> rightEye; //右眼
std::vector<NaughtyKidPoint> leftEye; //左眼
std::vector<NaughtyKidPoint> mouth; //上嘴唇
std::vector<NaughtyKidPoint> mouth2; //下嘴唇
double face_width;
double face_height;
};
struct dlib_facedetails
{
public:
dlib_face featurepoint;
double angleofface;
};
inline void to_json(nlohmann::json& j, const dlib_facedetails& p)
{
j = nlohmann::json
{
{"featurepoint",p.featurepoint},
{"angleofface",p.angleofface}
};
}
inline void from_json(const nlohmann::json& j, dlib_facedetails& p)
{
p.featurepoint = j.at("featurepoint").get<dlib_face>();
p.angleofface = j.at("angleofface").get<double>();
}
inline void to_json(nlohmann::json& j, const dlib_face& p) {
j = nlohmann::json{
{ "jaw", p.jaw },
{ "rightBrow", p.rightBrow },
{ "leftBrow", p.leftBrow },
{ "nose",p.nose },
{ "rightEye",p.rightEye },
{ "leftEye",p.leftEye },
{ "mouth",p.mouth },
{ "mouth2",p.mouth2 },
{"face_width",p.face_width},
{"face_height",p.face_height}
};
}
inline void from_json(const nlohmann::json& j, dlib_face& p) {
p.jaw = j.at("jaw").get<std::vector<NaughtyKidPoint>>();
p.rightBrow = j.at("rightBrow").get<std::vector<NaughtyKidPoint>>();
p.leftBrow = j.at("leftBrow").get<std::vector<NaughtyKidPoint>>();
p.nose = j.at("nose").get<std::vector<NaughtyKidPoint>>();
p.rightEye = j.at("rightEye").get<std::vector<NaughtyKidPoint>>();
p.leftEye = j.at("leftEye").get<std::vector<NaughtyKidPoint>>();
p.mouth = j.at("mouth").get<std::vector<NaughtyKidPoint>>();
p.mouth2 = j.at("mouth2").get<std::vector<NaughtyKidPoint>>();
p.face_width = j.at("face_width").get<double>();
p.face_height = j.at("face_height").get<double>();
}
}
序列化部分代码：
std::vector<NaughtyKidFaceRectangle::FaceRectangle> faces; nlohmann::json j = faces; std::ostringstream oss; oss << j << endl;
反序列化代码：
const auto js = nlohmann::json::parse(sp.c_str()); const dlib_face::dlib_face ddlibfaces = js;
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