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c 遍歷json對(duì)象集合

在C語(yǔ)言中遍歷JSON對(duì)象集合可以使用第三方庫(kù),比如JSON-C庫(kù)。該庫(kù)提供了讀取和修改JSON對(duì)象的API。

// JSON-C使用示例
// 創(chuàng)建JSON對(duì)象
json_object *jobj = json_object_new_object();
// 添加字符串屬性
json_object_object_add(jobj, "description", json_object_new_string("JSON-C demo"));
// 添加整數(shù)屬性
json_object_object_add(jobj, "version", json_object_new_int(1));
// 遍歷數(shù)組
json_object *jarray = json_object_new_array();
int i;
for (i = 0; i< 3; i++) {
json_object *jitem = json_object_new_string("item");
json_object_array_add(jarray, jitem);
}
json_object_object_add(jobj, "list", jarray);
// 遍歷對(duì)象
json_object *jnested = json_object_new_object();
json_object_object_add(jnested, "key", json_object_new_string("value"));
json_object_object_add(jobj, "nested", jnested);
// 輸出JSON字符串
char *output = (char*)json_object_to_json_string(jobj);
printf("output: %s\n", output);

JSON-C還提供了從文件讀取JSON對(duì)象或?qū)SON對(duì)象寫(xiě)入文件的函數(shù)。

// 從文件讀取JSON對(duì)象
char *filename = "input.json";
json_object *jinput = json_object_from_file(filename);
// 判斷讀取是否成功
if (jinput == NULL) {
printf("failed to read input file\n");
return;
}
// 修改JSON對(duì)象
json_object_object_add(jinput, "author", json_object_new_string("JSON-C team"));
// 將JSON對(duì)象寫(xiě)入文件
char *output_filename = "output.json";
FILE *fp = fopen(output_filename, "w");
if (fp != NULL) {
fputs(json_object_to_json_string(jinput), fp);
}
fclose(fp);

在讀取JSON對(duì)象時(shí),需要根據(jù)實(shí)際需要選擇從文件、字符串或流中讀取。在寫(xiě)入JSON對(duì)象時(shí),可以選擇按照格式化或緊湊的方式輸出。