Azure 函数上的 Emgucv 版本 4.2

我想在 Azure Function V3 中使用 EmguCv 版本 4.2

我创建了一个 Azure Function v3(.Net Core) 应用程序

从 Nuget 安装了 Emgu.Cv 版本 4.2.0.3636

也从 Nuget 安装了 Emgu.CV.Runtime.windows 版本 4.2.0.3636

[FunctionName("Function1")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
        ILogger log)
    {
        log.LogInformation("C# HTTP trigger function processed a request.");


        try
        {
            SetPathOfEmgu();
            var image = new Image<Bgr, byte>(256, 256);
        }
        catch (Exception ee)
        {
            return (ActionResult)new BadRequestObjectResult(ee.Message);
            throw;
        }



        return (ActionResult)new OkObjectResult($"All is well");
    }

    public static void SetPathOfEmgu()
    {
        string pathValue = System.Environment.GetEnvironmentVariable("PATH");
        string emguPath = @"D:\home\site\wwwroot\x64";
        var paths = pathValue.Split(';').Where(o => o != "").ToList();
        paths.Add(emguPath);
        pathValue = string.Join(";", paths.Distinct().ToArray()) + ";";

        System.Environment.SetEnvironmentVariable("PATH", pathValue);
    }

在调试中运行我得到：“一切都很好”

在 Azure 上运行时，我得到：“无法加载 DLL 'cvextern' 或其依赖项之一：找不到指定的模块。(0x8007007E)” 在“var image = new Image(256, 256);”行

问题：如何从 Azure Function V3 运行 Emgucv？

@斯图尔德： 来自：Emgu 42 Function V3.deps.json

{
  "runtimeTarget": {
    "name": ".NETCoreApp,Version=v3.0",
    "signature": ""
  },
  "compilationOptions": {},
  "targets": {
    ".NETCoreApp,Version=v3.0": {
      "Emgu 42 Function V3/1.0.0": {
        "dependencies": {
          "Emgu.CV": "4.2.0.3636",
          "Emgu.CV.runtime.windows": "4.2.0.3636",
          "Microsoft.NET.Sdk.Functions": "3.0.1"
        },
        "runtime": {
          "Emgu 42 Function V3.dll": {}
        }
      },
      "Emgu.CV/4.2.0.3636": {
        "runtime": {
          "lib/netstandard2.0/Emgu.CV.World.NetStandard.dll": {
            "assemblyVersion": "1.0.0.0",
            "fileVersion": "1.0.0.0"
          }
        }
      },
      "Emgu.CV.runtime.windows/4.2.0.3636": {
        "dependencies": {
          "Emgu.CV": "4.2.0.3636"
        }
      },

看来Azure功能并不能很好地支持Emgu，但根据一些测试，我找到了一个解决方法，可以帮助您解决问题。请参考以下步骤并尝试一下。

1.转到这个link https://www.codeproject.com/KB/cs/EMGU_Image_Processing/A_Basic_Program_x86.zip（您可能需要注册一个帐户然后登录），它将下载一个项目示例（名为“A_Basic_Program_x86”）。

2. Create a new azure function on Azure portal and open "kudu" by clicking "Advanced tools (Kudu)"

3. Then in kudu page, click "Debug console" --> "CMD" -- "site" --> "wwwroot" then create a new folder named "bin" under the "wwwroot" directory.

4. Open the project sample which we downloaded above, we can find some dll files in the directory of A_Basic_Program_x86\My Simple EMGU Program x86\My Simple EMGU Program\My EMGU Program\bin\Debug. In this directory, there are three dll files which are helpful to us. They are Emgu.CV.dll, Emgu.CV.UI.dll and Emgu.Util.dll.

5. Now, go to the "bin" folder which we create under the "wwwroot" directory and drag these three dll files from local into it.(shown as below screenshot)

6.回到工程样例，进入目录A_Basic_Program_x86\My Simple EMGU Program x86\My Simple EMGU Program\My EMGU Program。我们可以找到两个dll文件，名为opencv_core231.dll and opencv_imgproc231.dll。重复上面的步骤5，将这两个dll文件拖到“bin”文件夹中。这两个 dll 文件也显示在我上面提供的屏幕截图中。

7. Create a http trigger function in your function app and please refer to my code below (please notice the code in red box): Here provide the code same with the screenshot above for you to copy.

#r "Newtonsoft.Json"
#r "..\bin\Emgu.CV.dll"
#r "..\bin\Emgu.CV.UI.dll"
#r "..\bin\Emgu.Util.dll"


using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;
using Emgu.CV;
using Emgu.Util;
using Emgu.CV.Structure;

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
    log.LogInformation("C# HTTP trigger function processed a request.");

    string name = req.Query["name"];

    Image<Bgr, byte> image = new Image<Bgr, byte>(256, 256);

    string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
    dynamic data = JsonConvert.DeserializeObject(requestBody);
    name = name ?? data?.name;

    return name != null
        ? (ActionResult)new OkObjectResult($"Hello, {name}")
        : new BadRequestObjectResult("Please pass a name on the query string or in the request body");
}

现在我们可以在azure函数中使用“Image”和“Bgr”而不会出现任何错误消息。

希望有帮助~