Accessing an OpenCV C++ DLL from a C# program in VS 2022

C++
1

Following a Pluralsight course on OpenCV, I created a simple wrapper class in C++ and a consumer program in C#, all in the VS2022 IDE on Windows 11, using OpenCV 4.7.0. When I tried to call the dll from the C# program, the following exception occurred:
System.BadImageFormatException: ‘Could not load file or assembly ‘C++CLIWrapperToOpenCV, Version=1.0.8438.18274, Culture=neutral, PublicKeyToken=null’ or one of its dependencies. An attempt was made to load a program with an incorrect format.’

Inner exception
BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

The DLL and the C~ program are targetted at X64.

Any help gratefully received.

Regards,
Seymour.

2

can you be a bit more specific ?

havent done this in ages, but:

  • make absolutely sure, you compile / link your wrapper dlll in exactly the same way, the opencv libs were built (.eg. /MT, NO clr/.net flags !)
  • your dll will depend on other opencv dlls (unless you linked it statically). make sure, those are on the PATH, use tools like https://www.dependencywalker.com/ to find out, what exactly you need there