cJSON object to string将json对象转换成字符串

c - Converting cjson json to string 
try cJSON_PrintUnformatted. cJSON_Print will print with whitespace for formatting. If you want to print without formatting, use cJSON_PrintUnformatted.
cJSON_Print will give you "{\n\t\"type1\":\t\"car\",\n\t\"type2\":\t\"bus\"\n}"

Referenced from:https://stackoverflow.com/questions/56073560/converting-cjson-json-to-string
cJSON_Print会得到这样的结果：

"{\n\t\"type1\":\t\"car\",\n\t\"type2\":\t\"bus\"\n}"

cJSON_PrintUnformatted会得到如下结果

"{\"type1\":\"car\",\"type2\":\"bus\"}"

注意，要使用cJSON_free释放字符串指针。

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