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c 構(gòu)建一個(gè)json

JSON是一種常用的數(shù)據(jù)格式,它有很多優(yōu)點(diǎn)。在C語(yǔ)言中,可以通過(guò)構(gòu)建一個(gè)JSON來(lái)描述數(shù)據(jù)。以下是如何使用C語(yǔ)言構(gòu)建一個(gè)簡(jiǎn)單的JSON的示例:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STRING_LEN 256
typedef struct {
char *key;
char *value;
} Node;
typedef struct {
Node **nodes;
int size;
} Object;
typedef struct {
char *data;
} String;
typedef struct {
char *data;
} Number;
typedef struct {
Object *object;
} JSON;
void add_node_to_object(Object *object, char *key, char *value) {
Node *new_node = (Node *) malloc(sizeof(Node));
new_node->key = key;
new_node->value = value;
object->nodes = (Node **) realloc(object->nodes, sizeof(Node *) * (object->size+1));
object->nodes[object->size] = new_node;
object->size++;
}
Object *create_object() {
Object *object = (Object *) malloc(sizeof(Object));
object->nodes = NULL;
object->size = 0;
return object;
}
String *create_string(char *data) {
String *string = (String *) malloc(sizeof(String));
string->data = data;
return string;
}
Number *create_number(char *data) {
Number *number = (Number *) malloc(sizeof(Number));
number->data = data;
return number;
}
JSON *create_json() {
JSON *json = (JSON *) malloc(sizeof(JSON));
json->object = create_object();
return json;
}
void print_json(JSON *json) {
int i;
Object *object = json->object;
printf("{\n");
for(i=0; i<object->size; i++) {
printf("\t\"%s\": \"%s\"\n", object->nodes[i]->key, object->nodes[i]->value);
}
printf("}\n");
}
int main() {
JSON *json = create_json();
add_node_to_object(json->object, "name", "張三");
add_node_to_object(json->object, "age", "25");
add_node_to_object(json->object, "sex", "男");
print_json(json);
return 0;
}

上面的代碼中,我們構(gòu)建了一些結(jié)構(gòu)體,包括節(jié)點(diǎn)(Node)、對(duì)象(Object)、字符串(String)、數(shù)字(Number)和JSON。其中,節(jié)點(diǎn)是構(gòu)成對(duì)象的基本單元,而對(duì)象則可以包含多個(gè)節(jié)點(diǎn),節(jié)點(diǎn)按照鍵值對(duì)的形式存儲(chǔ)。字符串和數(shù)字是節(jié)點(diǎn)的具體內(nèi)容。整個(gè)JSON則是一個(gè)對(duì)象。

在主函數(shù)中,我們首先創(chuàng)建了一個(gè)JSON對(duì)象,然后添加了三個(gè)節(jié)點(diǎn),分別表示“姓名”、“年齡”和“性別”。最后,我們將JSON輸出到控制臺(tái),在控制臺(tái)上可以看到一個(gè)合法的JSON字符串。