unable to load cvextern in a c# project

Question

i\'m trying to debug my program, using emgu and HaarCascade in c#. i\'m getting an exception like so :

Unable to load DLL \'cvextern\': The specifie

Answer 1

The cvextern.dll should be in Windows\System32 for x86 and Windows\SysWOW64 for x64 it's work for me. ps: i used NuGet Package 'EmguCV' v3.1.0.1 with VS2015

Answer 2

Just Install : this nuget package

Because there are some unmanaged code and you have to add those reference on your project

See the ChangeLog

Answer 3

I have solved this problem, by:

• Right-click the project name, select Add, Select Add existing. Then select all files in the Emgu\libs\x64 folder to add to the project (allow to replace the old files if asked).
• Then you need to select all the newly added files, right click and select Properties, In the Copy to Output section, select Copy Always.

It's done.

Answer 4

My problem for this error was that VS2015 was running the web project in 32 bit IIS Express. The fix was to ensure it was using 64 bit IIS Express

I added this code at startup to remind myself when setting up a new machine

if (IntPtr.Size != 8)
{
     throw new Exception("Change VS options to ensure 64bit IIS Express");
}

Answer 5

This error popped up on my side with Emgu CV 3.1 and I found for this issue a following working solution:

copy the cvextern.dll in the application directory \bin\Debug\

Hope this helps.

Answer 6

for version 2.3 it`s list increases with opencv_ffmpeg.dll and opencv_flann231.dll.