I created a DLL using Visual Studio 2005 VC++ and marked a function for export (for testing).

I then took the .LIB file created, and ran it through the COFF2OMF converter program bundled with Borland C++ Builder 5 and it returns the following:

C:\>coff2omf -v -lib:ms MACEncryption.lib MACEncryption2.lib
COFF to OMF Converter Version 1.0.0.74 Copyright (c) 1999, 2000 Inprise Corporat
ion

Internal name                           Imported name

-------------                           -------------
??0CMACEncryptionApp@@QAE@XZ
?Decrypt@CMACEncryptionApp@@QAEXXZ
Encrypt                                 Encrypt@0

I added the MACEncryption2.lib file to my C++ Builder 5 Project by going to Project->Add to Project.. and selecting the library.

The application links, but it cannot find the Encrypt function that I am declaring for export as follows in the VC++ code:

extern "C" __declspec(dllexport) BSTR* __stdcall Encrypt()
{

    CoInitialize(NULL);
    EncryptionManager::_EncryptionManagerPtr pDotNetCOMPtr;

    HRESULT hRes = pDotNetCOMPtr.CreateInstance(EncryptionManager::CLSID_EncryptionManager);

    if (hRes == S_OK)
    {
        BSTR* str = new BSTR;
        BSTR filePath = (BSTR)"C:\\ICVER001.REQ";
        BSTR encrypt = (BSTR)"\"test";

        pDotNetCOMPtr->EncryptThirdPartyMessage(filePath, encrypt, str);

        return str;
    }

    return NULL;

    CoUninitialize ();
}

C++ Builder Code:

__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)

{
     Encrypt();

}

(Yes I know I am encapsulating another DLL.. I am doing this for a reason since Borland can't 'see' the .NET DLL definitions)

Can anyone tell me what I am doing wrong so I can figure out why Builder cannot find the function Encrypt() ?