How to use DllGetClassObject in InstallScript

[adeel_aziz]

Hi,

I need to use the DllGetClassObject function in InstallScript so that I can use .NET 5 COM DLL. The C++ syntax for DllGetClassObject function is:

HRESULT DllGetClassObject( REFCLSID rclsid, REFIID riid, LPVOID *ppv );

I have declared it as follows:

prototype INT OLE32.DllGetClassObject(POINTER, POINTER, BYREF OBJECT);

function VOID CheckDLL()
    OBJECT obj;
    STRING clsid, iid;
    INT nResult;
begin
    clsid = "B91EDCBD-F1A5-4C79-8FE0-1E42D2D67928";
    iid = "9657371B-CDBF-4EE4-A580-4B038E0D6E02";

    set obj = NOTHING;
    nResult = -1;
    nResult = DllGetClassObject(&clsid, &iid, obj);

end;

The nResult is returning -2147467262 and obj is null. I am not sure about the declaration and usage of this function. Can you please guide me on this?

Many Thanks,

Adeel.