自己实现的一个C语言json库

例程

#include "../json.h"

void doit(char *text)
{
    char *out;json_ht json;

    json=json_parse(text);
    if (!json) {printf("Error before: [%s]\n",json_error_get());}
    else
    {
        out=json_print(json,1);
        printf("%s\n",out);
        free(out);
    }
    json_delete(json);
}

void dofile(char *filename)
{
    FILE *f;long len;char *data;    
    f=fopen(filename,"rb");fseek(f,0,SEEK_END);len=ftell(f);fseek(f,0,SEEK_SET);
    data=(char*)malloc(JALIGN(len+1,4));fread(data,1,len,f);fclose(f);
    doit(data);
    free(data);
}

struct record 
{
    const char *precision;
    double lat,lon;
    const char *address,*city,*state,*zip,*country; 
};

void create_objects()
{
    json_ht root,fmt,img,thm,fld;char *out;int i;
    const char *strings[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

    int numbers[3][3]={{0,-1,0},{1,0,0},{0,0,1}};
    int ids[4]={116,943,234,38793};
    struct record fields[2]=
    {
        {"zip",37.7668,-1.223959e+2,"","SAN FRANCISCO","CA","94107","US"},
        {"zip",37.371991,-1.22026e+2,"","SUNNYVALE","CA","94085","US"}
    };

    root=json_object_new(); 
    json_object_add(root, "name", json_string_new("Jack (\"Bee\") Nimble"));
    json_object_add(root, "format", fmt=json_object_new());
    json_object_add(fmt,"type",json_string_new("rect"));
    json_object_add(fmt,"width",json_number_new(1920));
    json_object_add(fmt,"height",json_number_new(1080));
    json_object_add (fmt,"interlace",json_false_new());
    json_object_add(fmt,"frame rate",json_number_new(24));

    out=json_print(root,1); 
    json_delete(root);  
    printf("%s\n",out); 
    free(out);

    root=json_array_string_new(strings,7);
    out=json_print(root,1); 
    json_delete(root);  
    printf("%s\n",out); 
    free(out);

    root=json_array_new();
    for (i=0;i<3;i++)
    {
        json_array_add(root,json_array_int_new(numbers[i],3));
    }
    out=json_print(root,1); 
    json_delete(root);  
    printf("%s\n",out); 
    free(out);

    root=json_object_new();
    json_object_add(root, "Image", img=json_object_new());
    json_object_add(img,"Width",json_number_new(800));
    json_object_add(img,"Height",json_number_new(600));
    json_object_add(img,"Title",json_string_new("View from 15th Floor"));
    json_object_add(img, "Thumbnail", thm=json_object_new());
    json_object_add(thm, "Url", json_string_new("http:/*www.example.com/image/481989943"));
    json_object_add_number(thm,"Height",125);
    json_object_add(thm,"Width",json_string_new("100"));
    json_object_add(img,"IDs", json_array_int_new(ids,4));
    out=json_print(root,1); 
    json_delete(root);  
    printf("%s\n",out); 
    free(out);

    root=json_array_new();
    for (i=0;i<2;i++)
    {
        json_array_add(root,fld=json_object_new());
        json_object_add(fld, "precision", json_string_new(fields[i].precision));
        json_object_add(fld, "Latitude", json_number_new(fields[i].lat));
        json_object_add(fld, "Longitude", json_number_new(fields[i].lon));
        json_object_add(fld, "Address", json_string_new(fields[i].address));
        json_object_add(fld, "City", json_string_new(fields[i].city));
        json_object_add(fld, "State", json_string_new(fields[i].state));
        json_object_add(fld, "Zip", json_string_new(fields[i].zip));
        json_object_add(fld, "Country", json_string_new(fields[i].country));
    }   
    //json_object_replace(json_array_get(root,1),"City",json_int_array(ids,4)); 
    out=json_print(root,1); 
    json_delete(root);  
    printf("%s\n",out); 
    free(out);

}

void test()
{
    json_ht pJsonRoot = NULL,tf=NULL;

    pJsonRoot = json_object_new();
    if(NULL == pJsonRoot)
    {
        return ;
    }
    json_object_add_string(pJsonRoot, "hello", "hello world");
    json_object_add_number(pJsonRoot, "number", 10010);
    json_object_add_bool(pJsonRoot, "bool", 1);
    json_ht pSubJson = NULL;
    pSubJson = json_object_new();
    if(NULL == pSubJson)
    {
        json_delete(pJsonRoot);
        return ;
    }
    json_object_add_string(pSubJson, "subjsonobj", "a sub json string");
    json_object_add(pJsonRoot, "subobj", pSubJson);
    json_saveto_file(pJsonRoot,"test1.json");
    json_delete(pJsonRoot);
    printf("==========================================json_parse_file====================================================\n");

    tf = json_parse_file("test1.json");

    char * p = json_print(tf,1);
    if(NULL == p)
    {
        json_delete(tf);
        return ;
    }
    printf("%s\n", p);
    printf("============================================================================================================\n");
    json_delete(tf);
}

int main (int argc, const char * argv[]) 
{
    char text1[]="{\n\"name\": \"Jack (\\\"Bee\\\") Nimble\", \n\"format\": {\"type\":       \"rect\", \n\"width\":      1920, \n\"height\":     1080, \n\"interlace\":  false,\"frame rate\": 24\n}\n}";   

    doit(text1);
    test();
    create_objects();

    return 0;
}

源码地址:https://github.com/wzugang/json