c - 在 c 中迭代一个 cJSON 嵌套对象

Question

如何迭代嵌套的 cJSON 对象？我想从 C 中的 deviceData 父对象获取(打印)所有键和值。它是一个 cJson 对象。

 obj =     {      "command": "REPLACE_ROWS",
            "table": "Device.XXX",
            "deviceData": {
                    "device0": {
                      "DeviceName": "Filtered Device",
                        "MACAddress": "112233445599"
                    },
                    "device1": {
                        "DeviceName": "Filtered Device",
                        "MACAddress": "112233445599"
                    },
                    "device2": {
                        "DeviceName": "Filtered Device",
                        "MACAddress": "112233445599"
                    }
           }
    };

如何在 C 中打印 deviceData 的键(ex device0 device1 device 2 等等)。在此先感谢。

Answer 1

假设 obj 是一个包含您的对象的字符串，您解析它然后使用 next 进行迭代:

cJSON * root = cJSON_Parse(obj);
cJSON * deviceData = cJSON_GetObjectItem(root,"deviceData");
if( deviceData ) {
   cJSON *device = deviceData->child;
   while( device ) {
      // get and print key
      device = device->next;
   }
}