A call to PInvoke function '[...]' has unbalanced the stack

c# c++ pinvoke unmanaged managed
Sanctus2099 picture Sanctus2099 · May 31, 2010 · Viewed 42.6k times · Source

I'm getting this weird error on some stuff I've been using for quite a while. It may be a new thing in Visual Studio 2010 but I'm not sure.
I'm trying to call a unamanged function written in C++ from C#.
From what I've read on the internet and the error message itself it's got something to do with the fact that the signature in my C# file is not the same as the one from C++ but I really can't see it.
First of all this is my unamanged function below: 

TEngine GCreateEngine(int width,int height,int depth,int deviceType);

And here is my function in C#: 

[DllImport("Engine.dll", EntryPoint = "GCreateEngine", CallingConvention = CallingConvention.StdCall)]  
        public static extern IntPtr CreateEngine(int width,int height,int depth,int device);

When I debug into C++ I see all arguments just fine so thus I can only think it's got something to do with transforming from TEngine (which is a pointer to a class named CEngine) to IntPtr. I've used this before in VS2008 with no problem.

Answer

Scott Morken picture Scott Morken · Feb 8, 2011

I had a _cdecl c++ dll that I called without any trouble from Visual Studio 2008, and then the identical code in Visual Studio 2010 would not work. I got the same PInvoke ... has unbalanced the stack error as well.

The solution for me was to specify the calling convention in the DllImport(...) attribute: From:

[DllImport(CudaLibDir)]

To:

[DllImport(CudaLibDir, CallingConvention = CallingConvention.Cdecl)]

I guess they changed the default calling convention for DLLImport between .NET 3.5 and .NET 4.0?

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