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"Cannot Import dll" when importing C# DLL in Inno Setup

I know that this question has answer, but he does not help me. I saw articles: link and link, but I have problem. My code:

C#:

[DllExport("ServerOfDataBases", CallingConvention = CallingConvention.StdCall)]
public static int ServerOfDataBases(
  string server, string user, string password,
  [MarshalAs(UnmanagedType.BStr)] out string strout)
{
  string resultStr = String.Empty;
  // ...
  strout = resultStr;
  return 0; 
}

Inno Setup:

[Files] 
Source: "GetDataBases.dll"; Flags: dontcopy 

[Code] 
function ServerOfDataBases(server, user, password: string; out strout: WideString): Integer; 
  external 'ServerOfDataBases@files:GetDataBases.dll stdcall';

I get this error

Cannot Import dll:C:\Users...\AppData\Local\Temp\is-ECJ5V.tmp\GetDataBases.dll

Thank you for any idea.

Solution

  • Works for me, if I follow all the instructions from my answer to:
    Calling .NET DLL in Inno Setup

    So I would guess, that you didn't set the Platform target of your .NET/C# project to x86.

    For more about returning strings from DLL, see:
    Returning a string from a C# DLL with Unmanaged Exports to Inno Setup script