OpenCVSharp：无法加载 DLL 'OpenCvSharpExtern'

Question

我已经在我的项目中使用 NuGet 管理器安装了最新的 OpenCVSharp 2 (2.4.10.201...)。有关 OpenCVSharp.CvMat 的一切工作正常（加载、操作等）所以我确信安装是正确的。

然而我根本无法使用OpenCVSharp.CPlusPlus！ 问题是它没有加载 OpenCvSharpExtern.dll。

try-catch 块中显示的错误：

try
{
    Mat mat = new Mat();
} catch (Exception err)
{
    Console.WriteLine( err );
}

System.TypeInitializationException: The type initializer for 'OpenCvSharp.CPlusPlus.Mat' threw an exception. ---> System.DllNotFoundException: Unable to load DLL 'OpenCvSharpExtern': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
   at OpenCvSharp.CPlusPlus.NativeMethods.core_Mat_sizeof()
   at OpenCvSharp.CPlusPlus.Mat..cctor()
   --- End of inner exception stack trace ---
   at OpenCvSharp.CPlusPlus.Mat..ctor()
   at MainClass.Main() in C:\Users\kotsias\Documents\Visual Studio 2015\Projects\MyCVSharp\ConsoleApplication1\Test.cs:line 14

OpenCvSharpExtern.dllIS与我的.exe一起部署在下面子文件夹：

..\dll\x86

&

..\dll\x64

如果我手动将 x64 .dll 复制到与我的 .exe 相同的文件夹中，我仍然会遇到上述相同的错误。如果我复制 x86 .dll，我会得到一个不同的错误：

System.TypeInitializationException: The type initializer for 'OpenCvSharp.CPlusPlus.Mat' threw an exception. ---> System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
   at OpenCvSharp.CPlusPlus.NativeMethods.core_Mat_sizeof()
   at OpenCvSharp.CPlusPlus.Mat..cctor()
   --- End of inner exception stack trace ---
   at OpenCvSharp.CPlusPlus.Mat..ctor()
   at MainClass.Main() in C:\Users\kotsias\Documents\Visual Studio 2015\Projects\MyCVSharp\ConsoleApplication1\Test.cs:line 14

Answer 1

可能您没有安装正确版本的 Visual C++ Redistributable 包。

OpenCvSharp 2.4.10 使用 Visual C++ 2013 Redistributable Package。但是，OpenCvSharp 2.4.10 is deprecated and author recommends to use OpenCvSharp 3.2:

#OpenCvSharp 2.4.10 Cross platform wrapper of OpenCV 2.4.10 for .NET Framework.

This project is deprecated. The latest release is available in OpenCvSharp.

更多信息请查看：

Unable to load DLL (Module could not be found HRESULT: 0x8007007E) 讨论
Why Are There So Many “Microsoft Visual C++ Redistributables” Installed on My PC?篇文章
OpenCvSharp 3.2 NuGet 页。

Answer 2

在包管理器上使用此代码：

Install-Package OpenCvSharp4.Windows -Version 4.0.0.20190108

Answer 3

安装“OpencvSharp{version} nuget”包还不够。您还必须安装“OpencvSharp{version}.runtime.{operating_system}”包。

例如，在我的例子中，我必须安装以下 Nuget 包：

OpencvSharp4
OpencvSharp4.runtime.win

Answer 4

有些人可能遇到的另一个问题：

OpenCvSharpExtern.dll 需要作为媒体功能包一部分的 mfplat.dll。 Windows 'N' 版本默认不包含此项。

可以从应用和功能->可选功能->添加功能安装。

OpenCVSharp：无法加载 DLL 'OpenCvSharpExtern'

OpenCVSharp: Unable to load DLL 'OpenCvSharpExtern'

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