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);
}
}
}