displayengines.cpp

来自「在程序中加入脚本支持」· C++ 代码 · 共 48 行

void DisplayEngines(void)
{
// get the component category manager for this machine
    ICatInformation *pci = 0;
    HRESULT hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr, 
                                  0, CLSCTX_SERVER,
                                  IID_ICatInformation,
                                  (void**)&pci);
    if (SUCCEEDED(hr))
    {
// get the list of parseable script engines
        CATID rgcatidImpl[1];
        rgcatidImpl[0] = CATID_ActiveScriptParse;
        IEnumCLSID *pec = 0;
        hr = pci->EnumClassesOfCategories(1, rgcatidImpl, 0, 0, 
                                          &pec);
        if (SUCCEEDED(hr))
        {
// print the list of CLSIDs to the console as ProgIDs
            enum {CHUNKSIZE = 16};
            CLSID rgclsid[CHUNKSIZE];
            ULONG cActual;
            do
            {
                hr = pec->Next(CHUNKSIZE, rgclsid, &cActual);
                if (FAILED(hr))
                    break;
                if (hr == S_OK)
                    cActual = CHUNKSIZE;
                for (ULONG i = 0; i < cActual; i++)
                {
                    OLECHAR *pwszProgID = 0;
                    if (SUCCEEDED(ProgIDFromCLSID(rgclsid[i], &pwszProgID)))
                    {
                        printf("%S\n", pwszProgID);
                        CoTaskMemFree(pwszProgID);
                    }
                }
            }
            while (hr != S_FALSE);
            pec->Release();
        }
        pci->Release();
    }
    else
        printf("###error: couldn't load category manager\n");
}