Request 方法
构建Oracle请求。
命名空间：Neo.SmartContract.Framework.Native
程序集：Neo.SmartContract.Framework
语法#
public static extern void Request(string url, string filter, string callback, object userData, long gasForResponse);参数：
- url: 请求的Url；
- filter: 过滤器，可用于过滤无用数据；
- callback:回调函数；
- userData: 用户自定义数据；
- long: 获取响应所需的费用
示例#
namespace demo{ [DisplayName("Oracle Demo")] [ManifestExtra("Author", "Neo")] [ManifestExtra("Email", "dev@neo.org")] [ManifestExtra("Description", "This is a Oracle contract example")] public class OracleDemo: SmartContract { static readonly string PreResponseData = "ResponseData";
/// <summary> /// 构建一个Request请求 /// </summary> /// <param name="url">资源访问路径，e.g."http://127.0.0.1:8080/test"</param> /// <param name="filter">过滤器,e.g."$.value"; JSONPath, { "value": "hello world" }</param> /// <param name="callback">回调函数名,e.g."callback"</param> /// <param name="userData">用户自定义数据,e.g.new byte[0]</param> /// <param name="gasForResponse">响应执行费用,e.g.10000000</param> public static void Request(string url,string filter,string callback,byte[] userData,long gasForResponse) { Oracle.Request(url, filter, callback, userData, gasForResponse); }
/// <summary> /// 回调函数 /// </summary> /// <param name="url">资源访问路径</param> /// <param name="userData">用户自定义数据</param> /// <param name="code">响应状态码</param> /// <param name="result">响应结果数据</param> public static void Callback(string url, byte[] userData, int code, byte[] result) { Storage.Put(Storage.CurrentContext, PreResponseData, result.ToByteString()); } public static string GetData() { return Storage.Get(Storage.CurrentContext, PreResponseData); } }}