CFactoryTemplate Class (Compact 2013)

3/26/2014

CFactoryTemplate Class

This class provides a template used by the default class factory code.

Create one CFactoryTemplate object in an array for every object class so that the default class factory code can create new instances.

This class holds the name of the object, the object's class identifier (CLSID), and a pointer to the creation function for the corresponding object.

Initialize one of these in an array called g_Templates for each CLSID the application's DLL supports.

The creation function should take an LPUNKNOWN parameter and an HRESULT pointer and return an object derived from the CBaseObject class.

Set the HRESULT to a failed value if there is any error in construction.

An example declaration (from the Gargle sample filter) follows.

// list of class ids and creator functions for class factory
CFactoryTemplate g_Templates[2]= 
  { { L"Gargle filter"         // CFactoryTemplate.m_name
  , &CLSID_Gargle            // CFactoryTemplate.m_ClsID 
  , CGargle::CreateInstance  // CFactoryTemplate.m_lpfnNew
  , NULL                     // CFactoryTemplate.m_lpfnInit
  , &sudGargle               // CFactoryTemplate.m_pAMovieSetup_Filter
                                   }
  , { L"Gargle filter property page"
  , &CLSID_GargProp
  , CGargleProperties::CreateInstance
 }
 };
int g_cTemplates = sizeof(g_Templates) / sizeof(g_Templates[0]);

Note that the name of the object is strictly necessary only if you are using the DllRegisterServer setup routine to implement self-registering of your filter.

If you are not using this feature, you can set the first element of the g_Templates instance (m_Name) to NULL or L"".

Protected Data Members

Member	Description
m_ClsID	Pointer to the CLSID of the object class.
m_lpfnNew	Pointer to a function that creates an instance of the object class.
m_lpfnInit	Pointer to a function that initializes a new instance of the object class.
m_Name	Name of the filter; required when using filter self-registration services.
m_pAMovieSetup_Filter	Pointer to an AMOVIESETUP_FILTER structure; required when using filter self-registration services.

Member Functions

Member function	Description
CreateInstance	Calls the object-creation function for the class.
IsClassID	Determines whether a CLSID matches this class template.

Requirements

Header	dshow.h, Streams.h
Library	ole32.lib, Ole32auth.lib, Strmbase.lib, Strmiids.lib, uuid.lib

See Also

Reference

DirectShow Classes