System.DllNotFoundException in C# when use a native C++ dll

Guest User

12y16.1k

Hi everyone

I have a native C++ dll. Its closed source. I want to use it in my C# app, So I have to wrap the main dll with a class in C++. and I use this new wrapper dll in my C# app. please attention:

++) The main dll (that is closed source) called Engine.dll include the [int Init(UINT32 flag)] method.

I builed a C++ dll called DllWrapper.dll that use the above method, like bellow:

extern "C"

{

__declspec(dllexport) int Init(UINT32 flag, int *result)

{

// use the APIs of the Engine.dll

}

And in my C# app I use this dll. So in my machine (dev machine) the app is fine work. But when I copy the app and all required dll (all path is correct) in other machines and when I run the app, the following exception raised:

System.DllNotFoundException: Unable to load DLL "DllWrapper.dll": The specified module could not be found. (Exception from HRESULT: 0x8007007E)

p/s: I use the VS 2013 IDE.

Can any one help me?

Thanks in advanced.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sara simpleNewz12y ago
Excellent news that you found the answer to your problem - as I now have this problem! I am trying it now and crossing my fingers and toes for the same success! Many thanks for posting.
Guest User12y ago
Hi every one
After many many many search in the internet, finally I found my answer.

When you deploy a Visual C++ application to another computer, you must install both the application and any library files it depends on.

Visual Studio enables three ways to deploy the Visual C++ libraries together with your application: central deployment, local deployment, and static linking. [MSDN Article Here]

If you use the central deployment, you have to before install your application, install the appropriate version of VC++ redistributable package.
If your application use the standard C++ library then you can copy the "msvcp120.dll" library in your app folder. [MSDN Article Here]. You can find this library in folder that your visual studio is installed. for example in my PC its located on: "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\redist\x86\Microsoft.VC120.CRT".

I do this,and my problem is solved without install VC++ redistributable package.
Guest User12y ago
It seems configuration issue with another machine. Can you try to make same configuration available at other machine, e.g., if you've Turbo C++ compiler in your system with some path configuration, then try same settings.

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