版本：json-c-0.9.tar.gz
参考：http://blog.csdn.net/mengyafei43/article/details/38494139
示例代码：
1 #include <stdio.h> 2 #include <string.h> 3 #include <stdlib.h> 4 #include <unistd.h> 5 #include "json.h" 6 7 void encodeJson(); 8 void decodeJson(); 9 10 int main(int argc, char **argv) 11 { 12 int ret = 0; 13 14 encodeJson(); 15 16 decodeJson(); 17 18 return ret; 19 } 20 21 static char *json_type_to_name(int json_type) 22 { 23 char json_type_name[128]; 24 25 memset(json_type_name, 0x00, sizeof(json_type_name)); 26 switch(json_type) 27 { 28 case json_type_null: 29 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_null"); 30 break; 31 32 case json_type_boolean: 33 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_boolean"); 34 break; 35 36 case json_type_double: 37 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_double"); 38 break; 39 40 case json_type_int: 41 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_int"); 42 break; 43 44 case json_type_object: 45 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_object"); 46 break; 47 48 case json_type_array: 49 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_array"); 50 break; 51 52 case json_type_string: 53 snprintf(json_type_name, sizeof(json_type_name), "%s", "json_type_string"); 54 break; 55 } 56 57 return json_type_name; 58 } 59 60 static void getFieldValue(struct json_object *child_obj, const char *field) 61 { 62 struct json_object *obj = json_object_object_get(child_obj, field); 63 64 enum json_type obj_type = json_object_get_type(obj); 65 //printf("%s json_type is %s ", field, json_type_to_name(obj_type)); 66 67 if (obj_type == json_type_int) 68 { 69 printf("%s=%d ", field, json_object_get_int(obj)); 70 } 71 else if (obj_type == json_type_string) 72 { 73 printf("%s=%s ", field, json_object_get_string(obj)); 74 } 75 } 76 77 void decodeJson() 78 { 79 const char *json_string = "{ 80 "userinfo": [ 81 { "pin": "10000", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 82 { "pin": "10001", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 83 { "pin": "10002", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 84 { "pin": "10003", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 85 { "pin": "10004", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 86 { "pin": "10005", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 87 { "pin": "10006", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 88 { "pin": "10007", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 89 { "pin": "10008", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 }, 90 { "pin": "10009", "cardno": "123456789", "password": "123456", "name": "paul", "Privilege": 14, "flag": 1 } 91 ] }"; 92 93 int ret = 0; 94 int i = 0; 95 struct json_object *root_obj = NULL; 96 struct json_object *arry_obj = NULL; 97 struct json_object *child_obj = NULL; 98 struct lh_entry *entry = NULL; 99 char *key = NULL; 100 101 root_obj = json_tokener_parse(json_string); 102 entry = json_object_get_object(root_obj)->head; 103 if (entry) 104 { 105 key = (char *)entry->k; 106 arry_obj = (struct json_object *)entry->v; 107 108 if (json_type_array != json_object_get_type(arry_obj) 109 && json_type_object != json_object_get_type(arry_obj)) 110 { 111 return -1; 112 } 113 114 printf("key = %s ", key); 115 printf("array_obj = %s ", json_object_to_json_string(arry_obj)); 116 117 if (json_type_array == json_object_get_type(arry_obj)) 118 { 119 for(i = 0; i < json_object_array_length(arry_obj); i++) 120 { 121 child_obj = json_object_array_get_idx(arry_obj, i); 122 //printf("child_obj = %s ", json_object_to_json_string(child_obj)); 123 124 getFieldValue(child_obj, "pin"); 125 getFieldValue(child_obj, "cardno"); 126 getFieldValue(child_obj, "password"); 127 getFieldValue(child_obj, "name"); 128 getFieldValue(child_obj, "Privilege"); 129 getFieldValue(child_obj, "flag"); 130 printf(" "); 131 } 132 } 133 else if (json_type_object == json_object_get_type(arry_obj)) 134 { 135 136 } 137 } 138 139 } 140 141 void encodeJson() 142 { 143 int i = 0; 144 struct json_object *root_obj = NULL; 145 struct json_object *child_obj = NULL; 146 struct json_object *array_obj = NULL; 147 char *tmpStr = NULL; 148 149 root_obj = json_object_new_object(); 150 array_obj = json_object_new_array(); 151 152 for(i = 0; i < 10; i++) 153 { 154 child_obj = json_object_new_object(); 155 156 json_object_object_add(child_obj, "pin", json_object_new_string("10000")); 157 json_object_object_add(child_obj, "cardno", json_object_new_string("123456789")); 158 json_object_object_add(child_obj, "password", json_object_new_string("123456")); 159 json_object_object_add(child_obj, "name", json_object_new_string("paul")); 160 json_object_object_add(child_obj, "Privilege", json_object_new_int(14)); 161 json_object_object_add(child_obj, "flag", json_object_new_int(1)); 162 163 json_object_array_add(array_obj, child_obj); 164 child_obj = NULL; 165 } 166 167 json_object_object_add(root_obj, "userinfo", array_obj); 168 169 tmpStr = json_object_to_json_string(root_obj); 170 printf("%s ", tmpStr); 171 }
运行结果：
