add zh readme

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孙传宝 2020-03-14 00:07:53 +08:00
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csonStruct2JsonStr(&jstrOutput, &playList, play_list_ref_tbl);
```
## restrict
## Restrict
- Multidimensional arrays are not supported.
- Use size_t to save array size in structure, other types(int, short, char) are not supported now.
- Cjson is used by default. If you want to use jannson or other json lib, please modify $(JSON_LIB) in makefile.

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# cson
轻松完成C语言结构体和Json的转换。
其中Json字符串与Json对象例如Jansson库中的json_t之间的转换由第三方库实现例如Jansson或者cJSON请参考依赖库
cson真正实现的是Json对象与结构体间的转换。
## 编译
### 编译静态库
``` shell
$ git clone https://github.com/sunchb/cson.git
$ cd cson
$ make
```
### 编译示例
``` shell
$ cd demo
$ make
$ ./test
```
## 如何使用cson
1. 定义与Json协议对应的结构体。
2. 定义结构体的属性描述表。
3. 调用cson接口完成转换。
## 依赖
https://github.com/akheron/jansson.git
https://github.com/DaveGamble/cJSON.git
## 示例
下面具有各种数据类型的JSON。例如整数字符串实数布尔值对象和数组。我们将通过cson对其进行解码和编码。
``` json
{
"name":"jay zhou",
"creater":"dahuaxia",
"songNum":2,
"songList":[
{
"songName":"qilixiang",
"signerName":"jay zhou",
"albumName":"qilixiang",
"url":"www.kugou.com",
"duration":200,
"paid":false,
"price":6.6600000000000001,
"lyricNum":2,
"lyric":[
{
"time":1,
"text":"Sparrow outside the window"
},
{
"time":10,
"text":"Multi mouth on the pole"
}
]
},
{
"songName":"dongfengpo",
"signerName":"jay zhou",
"albumName":"dongfengpo",
"url":"music.qq.com",
"duration":180,
"paid":true,
"price":0.88,
"lyricNum":2,
"lyric":[
{
"time":10,
"text":"A sad parting, standing alone in the window"
},
{
"time":20,
"text":"I'm behind the door pretending you're not gone"
}
]
}
],
"extData":{
"a":999,
"b":1.05
}
}
```
### 1. 定义与Json协议对应的结构体。
即使不适用json通常我们也会这么做。
#### 注意事项
- 字符串必须定义为char*类型。
- 数组必须定义为指针类型。
- 如果结构体包含数组,需要为每一个数组定义一个额外的属性,用于保存数组大小。
``` c
typedef struct {
int time;
char* text; /* String must be declared as char* */
} Lyric;
typedef struct {
char* songName;
char* signerName;
char* albumName;
char* url;
int duration;
int paid;
double price;
size_t lyricNum; /* Declare additional properties to hold the array size */
Lyric* lyric; /* Array must be declared as pointer */
} SongInfo;
typedef struct {
int a;
double b;
} ExtData;
typedef struct {
char* name;
char* creater;
size_t songNum;
SongInfo* songList;
ExtData extData;
} PlayList;
```
### 2. 定义结构体的属性描述表。
使用以下宏定义描述结构体属性。
- _property_int(type, field)
- _property_real(type, field)
- _property_bool(type, field)
- _property_string(type, field)
- _property_obj(type, field, tbl)
- _property_array_object(type, field, tbl, arrayType, countfild) # I know it's a little cumbersome, I'm trying to simplify it.
- _property_array_int(type, field, arrayType, countfild)
- _property_array_string(type, field, arrayType, countfild)
- _property_array_real(type, field, arrayType, countfild)
- _property_array_bool(type, field, arrayType, countfild)
参数说明:
- type: type of data structure
- field: property name
- tbl: description table of the property type. use when object or object array
- arrayType: type of the array (Used to calculate size when dynamically get array memory)
- countfild: property to save array size
``` c
/* description for Lyric */
reflect_item_t lyric_ref_tbl[] = {
_property_int(Lyric, time),
_property_string(Lyric, text),
_property_end()
};
/* description for SongInfo */
reflect_item_t song_ref_tbl[] = {
_property_string(SongInfo, songName),
_property_string(SongInfo, signerName),
_property_string(SongInfo, albumName),
_property_string(SongInfo, url),
_property_int(SongInfo, duration),
_property_bool(SongInfo, paid),
_property_real(SongInfo, price),
_property_int(SongInfo, lyricNum),
_property_array(SongInfo, lyric, lyric_ref_tbl, Lyric, lyricNum), /* Lyric: type of array; lyricNum: property to save array size */
_property_end()
};
/* description for ExtData */
reflect_item_t ext_data_ref_tbl[] = {
_property_int(ExtData, a),
_property_real(ExtData, b),
_property_end()
};
/* description for PlayList */
reflect_item_t play_list_ref_tbl[] = {
_property_string(PlayList, name),
_property_string(PlayList, creater),
_property_int(PlayList, songNum),
_property_array(PlayList, songList, song_ref_tbl, SongInfo, songNum),
_property_obj(PlayList, extData, ext_data_ref_tbl),
_property_end()
};
```
### 3. 调用cson接口编解码Json。
``` c
PlayList playList;
/* Decode */
csonJsonStr2Struct(jStr, &playList, play_list_ref_tbl);
/* Encode */
char* jstrOutput;
csonStruct2JsonStr(&jstrOutput, &playList, play_list_ref_tbl);
```
## 限制
- 暂不支持多维数组。
- 默认使用Cjson库。如果需要使用jannson请修改Makefile中的$(JSON_LIB)变量。