Initializes the interface using a context.
public a_sqlany_interface_context * sqlany_init_ex( const char * app_name, sacapi_u32 api_version, sacapi_u32 * version_available )
app_name A string that names the API used, for example "PHP", "PERL", or "RUBY".
api_version The current API version that the application is using. This should normally be one of the SQLANY_API_VERSION_* macros
version_available An optional argument to return the maximum API version that is supported.
a context object on success and NULL on failure.