template< class license >
class CComClassFactory2 : public CComClassFactory2Base, license
Parameters
license
A class that implements the following static functions:
CComClassFactory2 implements the IClassFactory2 interface, which is an extension of IClassFactory. IClassFactory2 controls object creation through a license. A class factory executing on a licensed machine can provide a run-time license key. This license key allows an application to instantiate objects when a full machine license does not exist.
ATL objects normally acquire a class factory by deriving from CComCoClass. This class includes the macro DECLARE_CLASSFACTORY, which declares CComClassFactory as the default class factory. To use CComClassFactory2, specify the DECLARE_CLASSFACTORY2 macro in your object’s class definition. For example:
class CMyClass : ..., public CComCoClass< ... >
{
public:
DECLARE_CLASSFACTORY2(CMyLicense)
...
};
CMyLicense, the template parameter to CComClassFactory2, must implement the static functions VerifyLicenseKey, GetLicenseKey, and IsLicenseValid. The following is an example of a simple license class:
class CMyLicense
{
protected:
static BOOL VerifyLicenseKey(BSTR bstr)
{
USES_CONVERSION;
return !lstrcmp(OLE2T(bstr), _T("My run-time license key"));
}
static BOOL GetLicenseKey(DWORD dwReserved, BSTR* pBstr)
{
USES_CONVERSION;
*pBstr = SysAllocString( T2OLE(_T("My run-time license key")));
return TRUE;
}
static BOOL IsLicenseValid() { return TRUE; }
};
CComClassFactory2 derives from both CComClassFactory2Base and license. CComClassFactory2Base, in turn, derives from IClassFactory2 and CComObjectRootEx< CComGlobalsThreadModel >.
#include <atlcom.h>
See Also CComClassFactoryAutoThread, CComClassFactorySingleton, CComObjectRootEx, CComGlobalsThreadModel