HRESULT SHDOCVW_GetShellInstanceObjectClassObject	(	REFCLSID	rclsid,
		REFIID	riid,
		LPVOID *	ppvClassObj
	)
Definition at line 357 of file shlinstobj.c.
Referenced by DllGetClassObject().
{
    WCHAR wszInstanceKey[] = { 'C','L','S','I','D','\\','{','0','0','0','0','0','0','0','0','-',
        '0','0','0','0','-','0','0','0','0','-','0','0','0','0','-','0','0','0','0','0','0','0','0',
        '0','0','0','0','}','\\','I','n','s','t','a','n','c','e', 0 };
    const WCHAR wszCLSID[] = { 'C','L','S','I','D',0 };
    const WCHAR wszInitPropertyBag[] = 
        { 'I','n','i','t','P','r','o','p','e','r','t','y','B','a','g',0 };
    WCHAR wszCLSIDInstance[CHARS_IN_GUID];
    CLSID clsidInstance;
    HKEY hInstanceKey, hInitPropertyBagKey;
    DWORD dwType, cbBytes = sizeof(wszCLSIDInstance);
    IPropertyBag *pInitPropertyBag;
    HRESULT hr;
    LONG res;
        
    TRACE("(rclsid=%s, riid=%s, ppvClassObject=%p)\n", debugstr_guid(rclsid), debugstr_guid(riid), 
          ppvClassObj);

    /* Figure if there is an 'Instance' subkey for the given CLSID and acquire a handle. */
    if (!StringFromGUID2(rclsid, wszInstanceKey + 6, CHARS_IN_GUID) ||
        !(wszInstanceKey[5+CHARS_IN_GUID]='\\') || /* Repair the null-termination. */
        ERROR_SUCCESS != RegOpenKeyExW(HKEY_CLASSES_ROOT, wszInstanceKey, 0, KEY_READ, &hInstanceKey))
    {
        /* If there is no 'Instance' subkey, then it's not a Shell Instance Object. */
        return CLASS_E_CLASSNOTAVAILABLE;
    }

    if (RegQueryValueExW(hInstanceKey, wszCLSID, NULL, &dwType, (LPBYTE)wszCLSIDInstance, &cbBytes)
        != ERROR_SUCCESS || FAILED(CLSIDFromString(wszCLSIDInstance, &clsidInstance)))
    {
        /* 'Instance' should have a 'CLSID' value with a well-formed clsid-string. */
        FIXME("Failed to infer instance CLSID! %s\n", debugstr_w(wszCLSIDInstance));
        RegCloseKey(hInstanceKey);
        return CLASS_E_CLASSNOTAVAILABLE;
    }

    /* Try to open the 'InitPropertyBag' subkey. */
    res = RegOpenKeyExW(hInstanceKey, wszInitPropertyBag, 0, KEY_READ, &hInitPropertyBagKey);
    RegCloseKey(hInstanceKey);
    if (res != ERROR_SUCCESS) {
        /* Besides 'InitPropertyBag's, shell instance objects might be initialized by streams.
         * So this case might not be an error. */
        TRACE("No InitPropertyBag key found!\n");
        return CLASS_E_CLASSNOTAVAILABLE;
    }

    /* If the construction succeeds, the new RegistryPropertyBag is responsible for closing 
     * hInitProperyBagKey. */
    hr = RegistryPropertyBag_Constructor(hInitPropertyBagKey, &IID_IPropertyBag, 
                                         (LPVOID*)&pInitPropertyBag);
    if (FAILED(hr)) {
        RegCloseKey(hInitPropertyBagKey);
        return hr;
    }

    /* Construct an Instance Object Factory, which creates objects of class 'clsidInstance'
     * and asks them to initialize themselves with the help of the 'pInitiPropertyBag' */
    hr = InstanceObjectFactory_Constructor(&clsidInstance, pInitPropertyBag, riid, ppvClassObj);
    IPropertyBag_Release(pInitPropertyBag); /* The factory will hold a reference the bag. */
        
    return hr;
}
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