230 lines
7.3 KiB
C
230 lines
7.3 KiB
C
#include "cson.h"
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#include "stdio.h"
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#include "string.h"
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#include "stdlib.h"
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/**
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* 该示例会使用cson解析如下所示播放列表。
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*
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{
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"name":"jay zhou",
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"creater":"dahuaxia",
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"songNum":2,
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"songList":[
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{
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"songName":"qilixiang",
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"signerName":"jay zhou",
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"albumName":"qilixiang",
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"url":"www.kugou.com",
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"duration":200,
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"paid":false,
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"price":6.6600000000000001,
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"lyricNum":2,
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"lyric":[
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{
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"time":1,
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"text":"Sparrow outside the window"
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},
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{
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"time":10,
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"text":"Multi mouth on the pole"
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}
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],
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"key":[
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1234,
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5678,
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9876
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]
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},
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{
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"songName":"dongfengpo",
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"signerName":"jay zhou",
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"albumName":"dongfengpo",
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"url":"music.qq.com",
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"duration":180,
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"paid":true,
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"price":0.88,
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"lyricNum":2,
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"lyric":[
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{
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"time":10,
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"text":"A sad parting, standing alone in the window"
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},
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{
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"time":20,
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"text":"I'm behind the door pretending you're not gone"
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}
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],
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"key":[
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1111,
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2222,
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3333
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]
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}
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],
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"extData":{
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"a":999,
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"b":1.05
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}
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}
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*/
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/**
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* 1）首先我们需要定义与上面json相对应的数据结构。于是有了@PlayList、@ExtData、@SongInfo、@Lyric。
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* 即使不实用cson，想要解析json，通常你也需要这么做。
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*
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* 注意:结构体属性名需与json中字段名一致;
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* 注意:当某个字段在json中被定义为数组时，那么该字段在结构体中要被声名为指针，并且增加数组size的字段。
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*
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* 2）为了C语言能够像java中通过反射来操作结构体中的属性，我们需要先为每个结构体定义一个用于查找结构体属性的“反射表”，
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* 即play_list_ref_tbl，ext_data_ref_tbl，song_ref_tbl，lyric_ref_tbl。
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* 有了这个反射表，我们可以迭代访问数组元素。不仅可以帮助我们完成json解析，当我们想要输出对象各属性值、或是释放
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* 指针指向的堆内存时也很有用。
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*
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* TODO:目前反射表的结构有些复杂，虽然提供了宏定义让它用来稍稍方便一些。需要对该结构做出优化。
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*
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* 3）正确的完成上面两步，解析工作其实基本上就要完成了。只要再调用csonJsonStr2Struct，所有的属性就都会正确的赋值到结构体。
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*
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*/
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/*
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Step1:定义与json相对应的数据结构
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*/
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typedef struct {
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int time;
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char* text;
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} Lyric;
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typedef struct {
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char* songName;
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char* signerName;
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char* albumName;
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char* url;
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int duration;
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int paid;
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double price;
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size_t lyricNum;
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Lyric* lyric;
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size_t keyNum;
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int* key;
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size_t strNum;
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char** strList;
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} SongInfo;
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typedef struct {
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int a;
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double b;
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} ExtData;
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typedef struct {
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char* name;
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char* creater;
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size_t songNum;
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SongInfo* songList;
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ExtData extData;
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} PlayList;
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/*
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Step2:定义数据结构的反射表
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*/
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reflect_item_t lyric_ref_tbl[] = {
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_property_int(Lyric, time),
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_property_string(Lyric, text),
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_property_end()
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};
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reflect_item_t song_ref_tbl[] = {
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_property_string(SongInfo, songName),
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_property_string(SongInfo, signerName),
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_property_string(SongInfo, albumName),
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_property_string(SongInfo, url),
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_property_int(SongInfo, duration),
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_property_bool(SongInfo, paid),
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_property_real(SongInfo, price),
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_property_int(SongInfo, lyricNum),
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_property_array_object(SongInfo, lyric, lyric_ref_tbl, Lyric, lyricNum),
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_property_int(SongInfo, keyNum),
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_property_array_int(SongInfo, key, int, keyNum),
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_property_int(SongInfo, strNum),
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_property_array_string(SongInfo, strList, char*, strNum),
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_property_end()
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};
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reflect_item_t ext_data_ref_tbl[] = {
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_property_int(ExtData, a),
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_property_real(ExtData, b),
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_property_end()
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};
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reflect_item_t play_list_ref_tbl[] = {
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_property_string(PlayList, name),
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_property_string(PlayList, creater),
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_property_int(PlayList, songNum),
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_property_array_object(PlayList, songList, song_ref_tbl, SongInfo, songNum),
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_property_obj(PlayList, extData, ext_data_ref_tbl),
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_property_end()
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};
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void printPlayList(PlayList* list);
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void freePlayList(PlayList* list);
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const static char* jStr = "{\"name\":\"jay zhou\",\"creater\":\"dahuaxia\",\"songList\":[{\"songName\":\"qilixiang\",\"signerName\":\"jay zhou\",\"albumName\":\"qilixiang\",\"url\":\"www.kugou.com\",\"duration\":20093999939292928292234.1,\"paid\":false,\"price\":6.66,\"lyric\":[{\"time\":1,\"text\":\"Sparrow outside the window\"},{\"time\":10,\"text\":\"Multi mouth on the pole\"}],\"key\":[1111,2222,3333]},{\"songName\":\"dongfengpo\",\"signerName\":\"jay zhou\",\"albumName\":\"dongfengpo\",\"url\":\"music.qq.com\",\"duration\":180.9,\"paid\":true,\"price\":0.88,\"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\"}],\"key\":[1234,5678,9876],\"strList\":[\"abcd\",\"efgh\",\"ijkl\"]}],\"extData\":{\"a\":999,\"b\":1}}";
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/*
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Step3:调用csonJsonStr2Struct/csonStruct2JsonStr实现反序列化和序列化
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*/
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void test1()
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{
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printf("=========================================\n");
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printf("\t\tRunning %s\n", __FUNCTION__);
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printf("=========================================\n");
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PlayList playList;
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/* string to struct */
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int ret = csonJsonStr2Struct(jStr, &playList, play_list_ref_tbl);
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/* test print */
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printf("ret=%d\n", ret);
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printPlayList(&playList);
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char* jstrOutput;
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ret = csonStruct2JsonStr(&jstrOutput, &playList, play_list_ref_tbl);
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printf("ret=%d\nJson:%s\n", ret, jstrOutput);
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free(jstrOutput);
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freePlayList(&playList);
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}
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void* printProperty(void* pData, const reflect_item_t* tbl)
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{
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if (tbl->type == CSON_ARRAY || tbl->type == CSON_OBJECT) return NULL;
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if (tbl->type == CSON_INTEGER || tbl->type == CSON_TRUE || tbl->type == CSON_FALSE) printf("%s:%d\n", tbl->field, *(int*)pData);
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if (tbl->type == CSON_REAL) printf("%s:%f\n", tbl->field, *(double*)pData);
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if (tbl->type == CSON_STRING) printf("%s:%s\n", tbl->field, *((char**)pData));
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return NULL;
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}
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void* freePointer(void* pData, const reflect_item_t* tbl)
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{
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if (tbl->type == CSON_ARRAY || tbl->type == CSON_STRING) {
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printf("free field %s.\n", tbl->field);
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free(*(void**)pData);
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}
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return NULL;
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}
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void printPlayList(PlayList* list)
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{
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/* 调用loopProperty迭代结构体中的属性,完成迭代输出属性值 */
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csonLoopProperty(list, play_list_ref_tbl, printProperty);
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}
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void freePlayList(PlayList* list)
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{
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/* 调用loopProperty迭代结构体中的属性,释放字符串和数组申请的内存空间 */
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csonLoopProperty(list, play_list_ref_tbl, freePointer);
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}
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