如何在C ++上从数据库中读取身份验证过程？

Question

我试图在c ++上创建一个身份验证过程，包含和读取.txt文件作为数据库，其中user：pass已经定义。 问题是，如何声明变量＆＃34; user / pass＆＃34;从.txt文件读取并在c ++上进行身份验证。 另外，如何包含.txt文件以从中读取并在之后关闭。

示例：

<PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.3" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Versioning" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.2" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.2" />
    <PackageReference Include="Newtonsoft.Json" Version="10.0.2" />
    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="1.1.0" />
    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="1.1.2" />
    <PackageReference Include="OpenIddict" Version="1.0.0-beta2-0615" />
    <PackageReference Include="OpenIddict.EntityFrameworkCore" Version="1.0.0-beta2-0615" />
    <PackageReference Include="OpenIddict.Mvc" Version="1.0.0-beta2-0615" />

  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.1" />
  </ItemGroup>