How can I call a .NET DLL from an Inno Setup script?

Question

I want to call a function from a .NET DLL (coded in C#) from an Inno Setup script.

I have:

1. marked the Register for COM interop option in the project properties,
2. changed the ComVisible setting in the AssemblyInfo.cs file,
3. added these lines to the ISS script:

[Files]

Source: c:\temp\1\MyDLL.dll; Flags: dontcopy

[Code]

function MyFunction(): string;

external 'MyFunction@files:MyDLL.dll stdcall setuponly';

but I still get the following error:

Runtime Error (at -1:0):

Cannot Import dll:C:\DOCUME~1\foo\LOCALS~1\Temp\is-LRL3E.tmp\MyDLL.dll.

What am I doing wrong?

Answer 1

I read a little bit more about it - now I can see the difference between importing a C-style function and creating an OLE object.

Something like this would work for me:

[Code]
procedure MyFunction();
var
  oleObject: Variant;
begin
  oleObject := CreateOleObject('MyDLL.MyDLL');

  MsgBox(oleObject.MyFunction, mbInformation, mb_Ok);
end;

but it requires registering the DLL file.

I guess I will have to create a command-line application to call the functions from the DLL.