手机客户端扫描之后，可根据这些参数情况进行判断，是否向服务端发送请求。在做扫描应用（比如扫描登录）时，要依据业务场景进行消息传递，生成对应二维码，并不局限于json对象、url地址等。
总结下来，二维码应用场景，如下图：
5、扫描认证接口
为了满足【M】端扫描之后，提交UUID+用户信息进行认证，建立QRCode API接口。接口任务比较简单，就是对UUID合法性进行判断，然后判断用户信息登录情况，更改UUID的登录状态。
5.1 输入参数
using Abp.Application.Services.Dto;using System;using System.ComponentModel.DataAnnotations; namespace TxSms.Inputs{ /// <summary> /// 二维码登录认证 /// </summary> [Serializable] public class QRCodeVerifyInput : IInputDto { /// <summary> /// 构造函数 /// </summary> public QRCodeVerifyInput() { ConnectionId = Guid.Empty.ToString(); UUID = Guid.Empty; UserName = Password = ""; } /// <summary> /// 当前回话ID /// </summary> [DisplayFormat(ConvertEmptyStringToNull = false)] public string ConnectionId { get; set; } /// <summary> /// 唯一标识符号 /// </summary> public Guid UUID { get; set; } /// <summary> /// 用户账号 /// </summary> [DisplayFormat(ConvertEmptyStringToNull = false)] public string UserName { get; set; } /// <summary> /// 登录密码 /// </summary> [DisplayFormat(ConvertEmptyStringToNull = false)] public string Password { get; set; } /// <summary> /// 平台 /// </summary> [DisplayFormat(ConvertEmptyStringToNull = false)] public string Platform { get; set; } }}
5.2 输出参数
using Abp.Application.Services.Dto; using Newtonsoft.Json;using System.ComponentModel.DataAnnotations;using System.Web.Mvc;using TxSms.MVC;namespace TxSms.Outputs{ /// <summary> /// 输出基类 /// </summary> [ModelBinder(typeof(EmptyStringModelBinder))] public class TxSmsOutputDto : IOutputDto { /// <summary> /// 构造函数 /// </summary> public TxSmsOutputDto() { Result = 0; //默认为0，表示初始值或正确 Message = ""; } /// <summary> /// 错误代码 /// </summary> [JsonProperty("Result")] public int Result { get; set; } /// <summary> /// 错误信息 /// </summary> [DisplayFormat(ConvertEmptyStringToNull = false)] [JsonProperty("Message")] public string Message { get; set; } }}
5.3 API接口
using System;using System.Threading.Tasks;using System.Web.Http;using TxSms.Actions;using TxSms.Inputs;using TxSms.Outputs;namespace TxSms{ /// <summary> /// 二维码接口 /// </summary> public class QRCodeController : TxSmsApiController { /// <summary> /// 二维码登录认证 /// </summary> /// <returns> /// 0:登录成功；-1:参数错误 -2:ConnectionId、UUID、UserName、Password不允许为空-3:ConnectionId回话id不存在-4:UUID输入错误-5:UUID已过期 /// -6:本UUID已登录-7:登录账号已停用-8:登录账号已删除-9:登录密码输入错误-10:登录账号不存在 /// </returns> [AllowAnonymous] [HttpPost] public async Task<TxSmsOutputDto> QRCodeVerify([FromBody]QRCodeVerifyInput model) { TxSmsOutputDto result = new TxSmsOutputDto(); #region 参数验证 if (model.IsNull()) { result.Result = -1; result.Message = "参数错误"; return result; } if (model.ConnectionId.IsNullOrEmpty() || model.UUID.Equals(Guid.Empty) || model.UserName.IsNullOrEmpty() || model.Password.IsNullOrEmpty()) { result.Result = -2; result.Message = "ConnectionId、UUID、UserName、Password不允许为空"; return result; } #endregion 参数验证 #region 有效性判断 //验证ConnectionId合法性 if (QRCodeAction.QRCodeLists.ContainsKey(model.ConnectionId)) { result.Result = -3; result.Message = "ConnectionId回话id不存在"; return result; } //验证UUID有效性 var findCode = QRCodeAction.QRCodeLists[model.ConnectionId]; if (!model.UUID.Equals(findCode.UUID)) { result.Result = -4; result.Message = "UUID输入错误"; return result; } if (!findCode.IsValid()) { result.Result = -5; result.Message = "UUID已过期"; return result; } if (findCode.IsLogin) { result.Result = -6; result.Message = "本UUID已登录"; return result; } #endregion 有效性判断 LoginUserNameInput loginParam = new LoginUserNameInput { UserName = model.UserName, Password = model.Password, Platform = model.Platform }; LoginOutput loginResult = await new SessionController().LoginUserName(loginParam); switch (loginResult.Result) { case -1: result.Result = -7; result.Message = "登录账号已停用"; break; case -2: result.Result = -8; result.Message = "登录账号已删除"; break; case -3: result.Result = -9; result.Message = "登录密码输入错误"; break; case -4: result.Result = -10; result.Message = "登录账号不存在"; break; } if (loginResult.Result > 0) //登录成功，值为AccId { result.Result = 0; findCode.IsLogin = true; //更改登录状态 result.Message = "成功登录"; } return result; } }}
6、疑难解答
6.1 #16解答
二维码中可以加入图片吗？文中二维码 有个图片上面有 M 字母是怎么处理的？