在c語言中，我們可以使用第三方庫或手動解析的方式接受json字符串。

第三方庫：

#include <stdio.h>
#include <jansson.h>
int main() {
char *json_str = "{\"name\":\"Tom\",\"age\":18}";
json_t *root = NULL;
json_error_t error;
root = json_loads(json_str, 0, &error);
if (!root) {
printf("error: on line %d: %s\n", error.line, error.text);
return 1;
}
json_t *name = json_object_get(root, "name");
json_t *age = json_object_get(root, "age");
printf("name: %s\n", json_string_value(name));
printf("age: %d\n", json_integer_value(age));
json_decref(root);
return 0;
}

手動解析：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LEN 1024
int main() {
char *json_str = "{\"name\":\"Tom\",\"age\":18}";
char *name = NULL;
char *age = NULL;
char *p = json_str + 1;
while (*p != '}') {
char key[MAX_LEN] = {0};
char value[MAX_LEN] = {0};
sscanf(p, "\"%[^\"]\":\"%[^\"]\"", key, value);
if (strcmp(key, "name") == 0) {
name = strdup(value);
} else if (strcmp(key, "age") == 0) {
age = strdup(value);
}
p = strchr(p, ',') + 1;
}
printf("name: %s\n", name);
printf("age: %s\n", age);
free(name);
free(age);
return 0;
}