SSH Client connection (wodSSHTunnel)

Hello,

I want to create an SSH Client connection using the private/public key mechanism.
How can I generate in Visual Studio C++ a private key using :
Generate(KeyType, VARIANT);
Load(Filename, VARIANT);
Save(KeyType, Filename, VARIANT);

These methods are of Keys class, use VARIANT data type, that is non specific for C++.
How can I initialize a VARIANT type input parameter ?
These methods are chosen correctly for my purpose ?

Thanks for you help,
Mariana C.