红包功能简单介绍：
1、商户调用接口时，通过指定发送对象以及发送金额的方式发放红包，这样的方式，允许商户灵活的应用于各种各样丰富的活动场景
2、领取到红包后，用户的资金直接进入微信零钱，避免繁复的领奖流程，带给用户微信支付原生的流畅体验
现金红包官网文档地址：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_1
调用现金红包接口需要使用到证书，请前往商户平台下载证书
官网有关详细证书的介绍：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=4_3
因为发送现金红包是从商户平台余额扣款，所以商户平台的账户余额必须有充足的余额
下面是调用红包接口详细代码：1、签名的MD5加密类：
/// <summary>
/// MD5UtilHelper 的摘要说明。
/// </summary>
public class MD5UtilHelper
{
public MD5UtilHelper()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
/// 获取大写的MD5签名结果
/// </summary>
/// <param name="encypStr"></param>
/// <param name="charset"></param>
/// <returns></returns>
public static string GetMD5(string encypStr, string charset)
{
string retStr;
MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();
//创建md5对象
byte[] inputBye;
byte[] outputBye;
//使用GB2312编码方式把字符串转化为字节数组．
try
{
inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);
}
catch (Exception ex)
{
inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
}
outputBye = m5.ComputeHash(inputBye);
retStr = System.BitConverter.ToString(outputBye);
retStr = retStr.Replace("-", "").ToUpper();
return retStr;
}
}
2、处理参数的类：
public class RequestHandler
{
public RequestHandler(HttpContext httpContext)
{
Parameters = new Hashtable();
this.HttpContext = httpContext ?? HttpContext.Current;
}
/// <summary>
/// 密钥
/// </summary>
private string Key;
protected HttpContext HttpContext;
/// <summary>
/// 请求的参数
/// </summary>
protected Hashtable Parameters;
/// <summary>
/// debug信息
/// </summary>
private string DebugInfo;
/// <summary>
/// 初始化函数
/// </summary>
public virtual void Init()
{
}
/// <summary>
/// 获取debug信息
/// </summary>
/// <returns></returns>
public String GetDebugInfo()
{
return DebugInfo;
}
/// <summary>
/// 获取密钥
/// </summary>
/// <returns></returns>
public string GetKey()
{
return Key;
}
/// <summary>
/// 设置密钥
/// </summary>
/// <param name="key"></param>
public void SetKey(string key)
{
this.Key = key;
}
/// <summary>
/// 设置参数值
/// </summary>
/// <param name="parameter"></param>
/// <param name="parameterValue"></param>
public void SetParameter(string parameter, string parameterValue)
{
if (parameter != null && parameter != "")
{
if (Parameters.Contains(parameter))
{
Parameters.Remove(parameter);
}
Parameters.Add(parameter, parameterValue);
}
}
/// <summary>
/// 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名
/// </summary>
/// <param name="key">参数名</param>
/// <param name="value">参数值</param>
/// key和value通常用于填充最后一组参数
/// <returns></returns>
public virtual string CreateMd5Sign(string key, string value)
{
StringBuilder sb = new StringBuilder();
ArrayList akeys = new ArrayList(Parameters.Keys);
akeys.Sort();
foreach (string k in akeys)
{
string v = (string)Parameters[k];
if (null != v && "".CompareTo(v) != 0
&& "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
{
sb.Append(k + "=" + v + "&");
}
}
sb.Append(key + "=" + value);
string sign = MD5UtilHelper.GetMD5(sb.ToString(), GetCharset()).ToUpper();
return sign;
}
/// <summary>
/// 输出XML
/// </summary>
/// <returns></returns>
public string ParseXML()
{
StringBuilder sb = new StringBuilder();
sb.Append("<xml>");
foreach (string k in Parameters.Keys)
{
string v = (string)Parameters[k];
if (Regex.IsMatch(v, @"^[0-9.]$"))
{
sb.Append("<" + k + ">" + v + "</" + k + ">");
}
else
{
sb.Append("<" + k + "><![CDATA[" + v + "]]></" + k + ">");
}
}
sb.Append("</xml>");
return sb.ToString();
}
/// <summary>
/// 设置debug信息
/// </summary>
/// <param name="debugInfo"></param>
public void SetDebugInfo(String debugInfo)
{
this.DebugInfo = debugInfo;
}
public Hashtable GetAllParameters()
{
return this.Parameters;
}
protected virtual string GetCharset()
{
return this.HttpContext.Request.ContentEncoding.BodyName;
}
}
3、调用现金红包处理类：
/// <summary>
/// 企业号微信支付接口
/// </summary>
public static class TenPay
{
#region 企业向用户发红包
/// <summary>
/// 用于企业向微信用户个人发红包
/// 目前支持向指定微信用户的openid个人发红包
/// </summary>
/// <param name="certPassword">apiclient_cert.p12证书密码即商户号</param>
/// <param name="data">微信支付需要post的xml数据</param>
/// <param name="certPath">apiclient_cert.p12的证书物理位置(例如：E:\projects\文档\微信商户平台证书\商户平台API证书</param>
/// <param name="timeOut"></param>
/// <returns></returns>
public static string Sendredpack(string data, string certPassword,string certPath, int timeOut = Config.TIME_OUT)
{
var urlFormat = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
string cert = certPath;
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
X509Certificate2 cer = new X509Certificate2(cert, certPassword, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);
var formDataBytes = data == null ? new byte[0] : Encoding.UTF8.GetBytes(data);
MemoryStream ms = new MemoryStream();
ms.Write(formDataBytes, 0, formDataBytes.Length);
ms.Seek(0, SeekOrigin.Begin);//设置指针读取位置
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlFormat);
request.ClientCertificates.Add(cer);
request.Method = "POST";
request.Timeout = timeOut;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
#region 输入二进制流
if (ms != null)
{
ms.Position = 0;
//直接写入流
Stream requestStream = request.GetRequestStream();
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = ms.Read(buffer, 0, buffer.Length)) != 0)
{
requestStream.Write(buffer, 0, bytesRead);
}
ms.Close();//关闭文件访问
}
#endregion
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader myStreamReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8")))
{
string retString = myStreamReader.ReadToEnd();
return retString;
}
}
}
private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
if (errors == SslPolicyErrors.None)
return true;
return false;
}
#endregion
}
4、调用现金红包接口
#region 发送红包
bool fals = false; //记录发送红包是否成功
string xmlResult = null; //现金红包接口返回的xml
string certPath = null; //证书在服务器的物理位置
string data = null; //调用现金红包接口需要的数据
try
{
//创建支付应答对象
RequestHandler packageReqHandler = new RequestHandler(null);
//初始化
packageReqHandler.Init();
string nonceStr = TenPayV3Util.GetNoncestr(); //时间戳
//设置package订单参数
packageReqHandler.SetParameter("nonce_str", nonceStr); //随机字符串，不长于32位
packageReqHandler.SetParameter("mch_billno", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"] + model.JournalNumber);//商户订单号（每个订单号必须唯一）组成：mch_id+yyyymmdd+10位一天内不能重复的数字。接口根据商户订单号支持重入，如出现超时可再调用。
packageReqHandler.SetParameter("mch_id", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"]); //微信支付分配的商户号
packageReqHandler.SetParameter("wxappid", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_AppId"]);//微信分配的公众账号ID（企业号corpid即为此appId）。接口传入的所有appid应该为公众号的appid（在mp.weixin.qq.com申请的），不能为APP的appid（在open.weixin.qq.com申请的）。
packageReqHandler.SetParameter("send_name", "测试");//商户名称
packageReqHandler.SetParameter("re_openid", model.BankCard); //用户openid 接受红包的用户用户在wxappid下的openid
packageReqHandler.SetParameter("total_amount", Convert.ToInt32((decimal)(model.Amount * 100M)).ToString(CultureInfo.InvariantCulture)); //付款金额 单位分
packageReqHandler.SetParameter("total_num", "1"); //红包发放总人数
packageReqHandler.SetParameter("wishing", "测试红包"); //红包祝福语
packageReqHandler.SetParameter("client_ip", HttpContext.Current.Request.UserHostAddress);//Ip地址
packageReqHandler.SetParameter("act_name", "测试红包");//活动名称
packageReqHandler.SetParameter("remark", "测试红包"); //备注
string sign = packageReqHandler.CreateMd5Sign("key", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_Key"]);
packageReqHandler.SetParameter("sign", sign); //签名
data = packageReqHandler.ParseXML();
certPath = Server.MapPath("~/") + System.Configuration.ConfigurationManager.AppSettings["certPath"];
xmlResult = Sendredpack(data, System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"],certPath);
var res = XDocument.Parse(xmlResult);
string return_code = res.Element("xml").Element("return_code").Value;
if ("SUCCESS".Equals(return_code))
{
string result_code = res.Element("xml").Element("result_code").Value;
if ("SUCCESS".Equals(result_code))
{
fals = true;
}
}
}
catch (Exception exception)
{
}
#endregion
注意：证书所在文件夹权限，IIS必须有权限对该文件夹操作的权限。