├── .gitattributes ├── .github └── FUNDING.yml ├── QRCodeExample ├── appsettings.Development.json ├── appsettings.json ├── QRCodeExample.csproj ├── Program.cs ├── Properties │ └── launchSettings.json ├── Startup.cs └── Controllers │ └── QrController.cs ├── LICENSE ├── QRCodeExample.sln ├── README.md └── .gitignore /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | -------------------------------------------------------------------------------- /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | 2 | github: ssukhpinder 3 | buy_me_a_coffee: sukhpindersingh 4 | custom: https://medium.com/c-sharp-progarmming 5 | -------------------------------------------------------------------------------- /QRCodeExample/appsettings.Development.json: -------------------------------------------------------------------------------- 1 | { 2 | "Logging": { 3 | "LogLevel": { 4 | "Default": "Information", 5 | "Microsoft": "Warning", 6 | "Microsoft.Hosting.Lifetime": "Information" 7 | } 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /QRCodeExample/appsettings.json: -------------------------------------------------------------------------------- 1 | { 2 | "Logging": { 3 | "LogLevel": { 4 | "Default": "Information", 5 | "Microsoft": "Warning", 6 | "Microsoft.Hosting.Lifetime": "Information" 7 | } 8 | }, 9 | "AllowedHosts": "*" 10 | } 11 | -------------------------------------------------------------------------------- /QRCodeExample/QRCodeExample.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | netcoreapp3.1 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | -------------------------------------------------------------------------------- /QRCodeExample/Program.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Linq; 4 | using System.Threading.Tasks; 5 | using Microsoft.AspNetCore.Hosting; 6 | using Microsoft.Extensions.Configuration; 7 | using Microsoft.Extensions.Hosting; 8 | using Microsoft.Extensions.Logging; 9 | 10 | namespace QRCodeExample 11 | { 12 | public class Program 13 | { 14 | public static void Main(string[] args) 15 | { 16 | CreateHostBuilder(args).Build().Run(); 17 | } 18 | 19 | public static IHostBuilder CreateHostBuilder(string[] args) => 20 | Host.CreateDefaultBuilder(args) 21 | .ConfigureWebHostDefaults(webBuilder => 22 | { 23 | webBuilder.UseStartup(); 24 | }); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /QRCodeExample/Properties/launchSettings.json: -------------------------------------------------------------------------------- 1 | { 2 | "iisSettings": { 3 | "windowsAuthentication": false, 4 | "anonymousAuthentication": true, 5 | "iisExpress": { 6 | "applicationUrl": "http://localhost:58201", 7 | "sslPort": 44374 8 | } 9 | }, 10 | "$schema": "http://json.schemastore.org/launchsettings.json", 11 | "profiles": { 12 | "IIS Express": { 13 | "commandName": "IISExpress", 14 | "launchBrowser": true, 15 | "launchUrl": "api/qr/qenerate/test", 16 | "environmentVariables": { 17 | "ASPNETCORE_ENVIRONMENT": "Development" 18 | } 19 | }, 20 | "QRCodeExample": { 21 | "commandName": "Project", 22 | "launchBrowser": true, 23 | "launchUrl": "weatherforecast", 24 | "environmentVariables": { 25 | "ASPNETCORE_ENVIRONMENT": "Development" 26 | }, 27 | "applicationUrl": "https://localhost:5001;http://localhost:5000" 28 | } 29 | } 30 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2024 Sukhpinder Singh 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /QRCodeExample.sln: -------------------------------------------------------------------------------- 1 | 2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30330.147 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QRCodeExample", "QRCodeExample\QRCodeExample.csproj", "{EF38D753-7832-493C-A216-0F44F0B38BE9}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {EF38D753-7832-493C-A216-0F44F0B38BE9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {EF38D753-7832-493C-A216-0F44F0B38BE9}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {EF38D753-7832-493C-A216-0F44F0B38BE9}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {EF38D753-7832-493C-A216-0F44F0B38BE9}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {946AB49D-55C0-481D-8421-9D08A839D04A} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /QRCodeExample/Startup.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Linq; 4 | using System.Threading.Tasks; 5 | using Microsoft.AspNetCore.Builder; 6 | using Microsoft.AspNetCore.Hosting; 7 | using Microsoft.AspNetCore.HttpsPolicy; 8 | using Microsoft.AspNetCore.Mvc; 9 | using Microsoft.Extensions.Configuration; 10 | using Microsoft.Extensions.DependencyInjection; 11 | using Microsoft.Extensions.Hosting; 12 | using Microsoft.Extensions.Logging; 13 | 14 | namespace QRCodeExample 15 | { 16 | public class Startup 17 | { 18 | public Startup(IConfiguration configuration) 19 | { 20 | Configuration = configuration; 21 | } 22 | 23 | public IConfiguration Configuration { get; } 24 | 25 | // This method gets called by the runtime. Use this method to add services to the container. 26 | public void ConfigureServices(IServiceCollection services) 27 | { 28 | services.AddControllers(); 29 | } 30 | 31 | // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. 32 | public void Configure(IApplicationBuilder app, IWebHostEnvironment env) 33 | { 34 | if (env.IsDevelopment()) 35 | { 36 | app.UseDeveloperExceptionPage(); 37 | } 38 | 39 | app.UseHttpsRedirection(); 40 | 41 | app.UseRouting(); 42 | 43 | app.UseAuthorization(); 44 | 45 | app.UseEndpoints(endpoints => 46 | { 47 | endpoints.MapControllers(); 48 | }); 49 | } 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /QRCodeExample/Controllers/QrController.cs: -------------------------------------------------------------------------------- 1 | using System; 2 | using System.Collections.Generic; 3 | using System.Drawing; 4 | using System.IO; 5 | using System.Linq; 6 | using System.Threading.Tasks; 7 | using Microsoft.AspNetCore.Http; 8 | using Microsoft.AspNetCore.Mvc; 9 | using QRCoder; 10 | 11 | namespace QRCodeExample.Controllers 12 | { 13 | [Route("api/[controller]")] 14 | [ApiController] 15 | public class QrController : ControllerBase 16 | { 17 | 18 | [HttpGet] 19 | [Route("qenerate/{qrText}")] 20 | public IActionResult GetQrCode(string qrText) 21 | { 22 | QRCodeGenerator qrGenerator = new QRCodeGenerator(); 23 | QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); 24 | QRCode qrCode = new QRCode(qrCodeData); 25 | Bitmap qrCodeImage = qrCode.GetGraphic(20); 26 | 27 | return File(BitmapToBytes(qrCodeImage), "image/jpeg"); 28 | } 29 | 30 | [HttpGet] 31 | [Route("qenerate-color/{qrText}")] 32 | public IActionResult GetColorQrCode(string qrText) 33 | { 34 | QRCodeGenerator qrGenerator = new QRCodeGenerator(); 35 | QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); 36 | QRCode qrCode = new QRCode(qrCodeData); 37 | Bitmap qrCodeImage = qrCode.GetGraphic(20, Color.DarkRed, Color.PaleGreen, true); 38 | 39 | return File(BitmapToBytes(qrCodeImage), "image/jpeg"); 40 | } 41 | 42 | private static Byte[] BitmapToBytes(Bitmap img) 43 | { 44 | using (MemoryStream stream = new MemoryStream()) 45 | { 46 | img.Save(stream, System.Drawing.Imaging.ImageFormat.Png); 47 | return stream.ToArray(); 48 | } 49 | } 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | A QR code is a computer-readable identification that contains data about the item to which it is attached. The article demonstrates how to return the QR Code image as a response from .Net Core API. 2 | 3 | ### QR-Code Live Demo 4 | 5 | ![](https://cdn-images-1.medium.com/max/3158/1*GBJfp_W-WOMcEldZRCQTjw.gif) 6 | 7 | ## Prerequisites 8 | 9 | * Visual Studio or Visual Studio Code already installed 10 | 11 | * Install the below package, i.e., “QRCoder” via NuGet package manager. 12 | 13 | Install-Package QRCoder 14 | 15 | ## Let’s Start 16 | 17 | The “QRCoder” DLL helps to generate QR code with just four lines of code in C#. 18 | 19 | ### 4 Lines of Code Snippet 20 | 21 | QRCodeGenerator qrGenerator = new QRCodeGenerator(); 22 | QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); 23 | QRCode qrCode = new QRCode(qrCodeData); 24 | Bitmap qrCodeImage = qrCode.GetGraphic(20); 25 | 26 | ## Description of each line of code 27 | 28 | ### Initialize the QR code generator class 29 | 30 | Create an instance of the QRCodeGenerator class. 31 | 32 | QRCodeGenerator qrGenerator = new QRCodeGenerator(); 33 | 34 | ### Create QR code data 35 | 36 | The next step is to initialize QR code data using the CreateQrCode method, which takes two arguments, i.e., string text for encoding inside the QR code, and another case defines the error correction level, i.e., ECCLevel. 37 | 38 | Here, four different levels L (7%), M (15%), Q (25%) and H (30%) are available, whereby the percentage represents the hidden portion of the QR-code until the error correction algorithm can’t recreate the original message encoded in the QR code. 39 | 40 | QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); 41 | 42 | ### Generate QR code 43 | 44 | The next step is to create the QR-code using the data initialized above. 45 | 46 | QRCode qrCode = new QRCode(qrCodeData); 47 | 48 | ### Create a graphical image 49 | 50 | Finally, represent the QR code into a graphical image, as shown below. The GetGraphic method takes one argument, which defines the size of QR-code. The GetGraphic method return image in the form of Bitmap by default. 51 | 52 | Bitmap qrCodeImage = qrCode.GetGraphic(20); 53 | 54 | ## How to return QR-code Image from .Net Core API response? 55 | 56 | Controller GET route snippet uses the QR-code library and returns the QR code image as a response. 57 | 58 | ``` 59 | [HttpGet] 60 | [Route("qenerate/{qrText}")] 61 | public IActionResult GetQrCode(string qrText) 62 | { 63 | QRCodeGenerator qrGenerator = new QRCodeGenerator(); 64 | QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q); 65 | QRCode qrCode = new QRCode(qrCodeData); 66 | Bitmap qrCodeImage = qrCode.GetGraphic(20); 67 | return File(BitmapToBytes(qrCodeImage), "image/jpeg"); 68 | } 69 | ``` 70 | 71 | ### Bitmap to bytes function code snippet 72 | 73 | QR-code, by default, generates a Bitmap, below function used to convert Bitmap to bytes. 74 | 75 | ``` 76 | private static Byte[] BitmapToBytes(Bitmap img) 77 | { 78 | using (MemoryStream stream = new MemoryStream()) 79 | { 80 | img.Save(stream, System.Drawing.Imaging.ImageFormat.Png); 81 | return stream.ToArray(); 82 | } 83 | } 84 | ``` 85 | 86 | ## Optional parameters & overloads 87 | **//Set color by using Color-class types** 88 | Bitmap qrCodeImage = qrCode.GetGraphic(20, Color.DarkRed, Color.PaleGreen, true); 89 | **//Set color by using HTML hex color notation** 90 | Bitmap qrCodeImage = qrCode.GetGraphic(20, "#000ff0", "#0ff000"); 91 | **//Set logo in center of QR-code** 92 | Bitmap qrCodeImage = qrCode.GetGraphic(20, Color.Black, Color.White, (Bitmap)Bitmap.FromFile("C:\\myimage.png")); 93 | 94 | ### Example of QR-code with my publication “[The Tech Masters](https://medium.com/the-tech-masters)” logo 95 | 96 | ![](https://cdn-images-1.medium.com/max/2000/1*OdVSbx5DtYrxdJ2Q9fEf7A.png) 97 | 98 | [Github Repo](https://github.com/ssukhpinder/QRCodeExample) 99 | 100 | Thank you for reading. Keep visiting and share this in your network. Please put your thoughts and feedback in the comments section. 101 | 102 | Follow me on [Medium](https://singhsukhpinder.medium.com/) 103 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Build results 17 | [Dd]ebug/ 18 | [Dd]ebugPublic/ 19 | [Rr]elease/ 20 | [Rr]eleases/ 21 | x64/ 22 | x86/ 23 | [Aa][Rr][Mm]/ 24 | [Aa][Rr][Mm]64/ 25 | bld/ 26 | [Bb]in/ 27 | [Oo]bj/ 28 | [Ll]og/ 29 | 30 | # Visual Studio 2015/2017 cache/options directory 31 | .vs/ 32 | # Uncomment if you have tasks that create the project's static files in wwwroot 33 | #wwwroot/ 34 | 35 | # Visual Studio 2017 auto generated files 36 | Generated\ Files/ 37 | 38 | # MSTest test Results 39 | [Tt]est[Rr]esult*/ 40 | [Bb]uild[Ll]og.* 41 | 42 | # NUNIT 43 | *.VisualState.xml 44 | TestResult.xml 45 | 46 | # Build Results of an ATL Project 47 | [Dd]ebugPS/ 48 | [Rr]eleasePS/ 49 | dlldata.c 50 | 51 | # Benchmark Results 52 | BenchmarkDotNet.Artifacts/ 53 | 54 | # .NET Core 55 | project.lock.json 56 | project.fragment.lock.json 57 | artifacts/ 58 | 59 | # StyleCop 60 | StyleCopReport.xml 61 | 62 | # Files built by Visual Studio 63 | *_i.c 64 | *_p.c 65 | *_h.h 66 | *.ilk 67 | *.meta 68 | *.obj 69 | *.iobj 70 | *.pch 71 | *.pdb 72 | *.ipdb 73 | *.pgc 74 | *.pgd 75 | *.rsp 76 | *.sbr 77 | *.tlb 78 | *.tli 79 | *.tlh 80 | *.tmp 81 | *.tmp_proj 82 | *_wpftmp.csproj 83 | *.log 84 | *.vspscc 85 | *.vssscc 86 | .builds 87 | *.pidb 88 | *.svclog 89 | *.scc 90 | 91 | # Chutzpah Test files 92 | _Chutzpah* 93 | 94 | # Visual C++ cache files 95 | ipch/ 96 | *.aps 97 | *.ncb 98 | *.opendb 99 | *.opensdf 100 | *.sdf 101 | *.cachefile 102 | *.VC.db 103 | *.VC.VC.opendb 104 | 105 | # Visual Studio profiler 106 | *.psess 107 | *.vsp 108 | *.vspx 109 | *.sap 110 | 111 | # Visual Studio Trace Files 112 | *.e2e 113 | 114 | # TFS 2012 Local Workspace 115 | $tf/ 116 | 117 | # Guidance Automation Toolkit 118 | *.gpState 119 | 120 | # ReSharper is a .NET coding add-in 121 | _ReSharper*/ 122 | *.[Rr]e[Ss]harper 123 | *.DotSettings.user 124 | 125 | # JustCode is a .NET coding add-in 126 | .JustCode 127 | 128 | # TeamCity is a build add-in 129 | _TeamCity* 130 | 131 | # DotCover is a Code Coverage Tool 132 | *.dotCover 133 | 134 | # AxoCover is a Code Coverage Tool 135 | .axoCover/* 136 | !.axoCover/settings.json 137 | 138 | # Visual Studio code coverage results 139 | *.coverage 140 | *.coveragexml 141 | 142 | # NCrunch 143 | _NCrunch_* 144 | .*crunch*.local.xml 145 | nCrunchTemp_* 146 | 147 | # MightyMoose 148 | *.mm.* 149 | AutoTest.Net/ 150 | 151 | # Web workbench (sass) 152 | .sass-cache/ 153 | 154 | # Installshield output folder 155 | [Ee]xpress/ 156 | 157 | # DocProject is a documentation generator add-in 158 | DocProject/buildhelp/ 159 | DocProject/Help/*.HxT 160 | DocProject/Help/*.HxC 161 | DocProject/Help/*.hhc 162 | DocProject/Help/*.hhk 163 | DocProject/Help/*.hhp 164 | DocProject/Help/Html2 165 | DocProject/Help/html 166 | 167 | # Click-Once directory 168 | publish/ 169 | 170 | # Publish Web Output 171 | *.[Pp]ublish.xml 172 | *.azurePubxml 173 | # Note: Comment the next line if you want to checkin your web deploy settings, 174 | # but database connection strings (with potential passwords) will be unencrypted 175 | *.pubxml 176 | *.publishproj 177 | 178 | # Microsoft Azure Web App publish settings. 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