C++ support in CAMAPI

Support export function

You native DLL should have export function, which will be entry point:

extern "C" __declspec(dllexport) void* __stdcall CreateInstanceOfExtension(const wchar_t* PluginID) {
  // create instance of your class
  IExtensionPtr resultPtr = new ExtensionUtilityExample();

  // modify as pointer
  resultPtr.AddRef();
  void* res = resultPtr.GetInterfacePtr();
  return (res);
}

Its logic can be more complex, but it is important that the result of the function is a pointer with an incremented reference count.

Connecting the SDK

The SDK is stored as package SprutTechnology.CAMAPI.SDK.tlb on nuget.org. In the BuildSystem, you can configure it to download and extract this package to a specific directory before compilation. Then, this directory needs to be connected in the Delphi project settings.

In build.cs:

• Add in list of ManagerProps:

new RestorerNugetProps
{
    Name = "RestorerNuget",
    DepsProp = new List<RestorerDepProp>
    {
        new()
        {
            PackageId = "SprutTechnology.CAMAPI.SDK.tlb",
            Version = "18.2.0", 
            OutDir = Path.Combine(RootDirectory.Parent, "SDK")
        }
    }
}

• Specify accordance:

settings.ManagerNames.Add("restorer", "Debug", "RestorerNuget");
settings.ManagerNames.Add("restorer", "Release", "RestorerNuget");

• Add restore before compile in target:

private Target Compile => _ => _
    .Executes(() =>
    {
        _buildSpace.Projects.Restore(Variant);
        _buildSpace.Projects.Compile(Variant, true);
    });

In this way, any other package can be connected - similar to PackageReference in C# projects.