brewextension.c

brew下extension开发的源代码

/*===========================================================================

FILE: brewextension.c
===========================================================================*/


/*===============================================================================
INCLUDES AND VARIABLE DEFINITIONS
=============================================================================== */
#include "AEEShell.h"           // Shell interface definitions
#include "AEEStdlib.h"

#include "brewextension.bid"
#include "brewextension.h"

/*-------------------------------------------------------------------
Applet structure. All variables in here are reference via "pMe->"
-------------------------------------------------------------------*/
// create an applet structure that's passed around. All variables in
// here will be able to be referenced as static.
typedef struct IBrewExtension 
{
    AEEVTBL(IBrewExtension) *pvt;
    
    IShell      *m_pIShell;
    int         m_nRefs;

} IBrewExtension;


int AEEClsCreateInstance(IShell *pIShell, AEECLSID cls, void **ppObj)
{
   *ppObj = NULL;

   if( cls == AEECLSID_BREWEXTENSION) 
   {
      return IBrewExtension_New(pIShell, cls, (IBrewExtension**)ppObj);
   }

   return EFAILED;
}



int IBrewExtension_Release(IBrewExtension *pMe)
{
    if( --pMe->m_nRefs != 0 )
    {
        return pMe->m_nRefs;
    }


    FREE_VTBL(pMe, IModule);

    FREE( pMe );

    return 0;
}

int IBrewExtension_AddRef(IBrewExtension *pMe)
{
    return ++(pMe->m_nRefs);
}

int IBrewExtension_MaxInt(IBrewExtension *pMe, int iValue1, int iValue2)
{
    return iValue1 > iValue2 ? iValue1:iValue2;
}

int IBrewExtension_New(IShell *pIShell, AEECLSID cls,  void **ppObj)
{
    int nSize;
    IBrewExtension *pMe = NULL;

    VTBL(IBrewExtension) *modFuncs;

    nSize = sizeof(IBrewExtension);


    if( (pMe = (IBrewExtension*)MALLOC(nSize +                                       

                      sizeof(VTBL(IBrewExtension)))) == NULL )

        return ENOMEMORY; 

    modFuncs = (VTBL(IBrewExtension)*)((byte *)pMe + nSize);

    modFuncs->AddRef              = IBrewExtension_AddRef;
    modFuncs->Release             = IBrewExtension_Release;
    modFuncs->MaxInt              = IBrewExtension_MaxInt;


    INIT_VTBL(pMe, IBrewExtension, *modFuncs);

    pMe->m_nRefs      = 1;
    pMe->m_pIShell    = pIShell;

    ISHELL_AddRef(pIShell);

    *ppObj = (IModule*)pMe;


    return AEE_SUCCESS;
}