Question

I have the following C++ function and C# p/invoke decleration:

//C#
[DllImport("capture.dll", EntryPoint = "setup")]
public static extern void captureSetup(int rr);

//C++
extern "C" {
    __declspec(dllexport) void setup(int rr)

But I am getting an error about a p/invoke unbalanced stack likely caused by the managed signature not matching the unmanaged signature.

Can anyone see what is wrong with this?

Answer 1

It’s a calling convention mismatch. The C++ code uses cdecl by default but the C# assumes stdcall. You need to make them match, e.g.

[DllImport("capture.dll", EntryPoint = "setup", 
    CallingConvention = CallingConvention.Cdecl)]
public static extern void captureSetup(int rr);