// If the handle is valid, try to get the function address.
 
    if (hinstLib != NULL)
    {   
        ProcAdd =(MYPROC)GetProcAddress(hinstLib, "DllGetClassObject");
 
        // If the function address is valid, call the function.
 
        if (fRunTimeLinkSuccess = (ProcAdd != NULL))
  {  
   CLSID rclsid;
   IID riid;
   
   if(strrclsid==NULL)
   {
    FreeLibrary(hinstLib);
    return 0;
   }
   CLSIDFromString((LPOLESTR )strrclsid,&rclsid);

   if(strriid!=NULL)
    CLSIDFromString((LPOLESTR )strriid,&riid);
   else
    riid=IID_IUnknown;

   IClassFactory *pIf=NULL;

            if(ProcAdd(rclsid,IID_IClassFactory,(void **)&pIf)==S_OK && pIf!=NULL)
   {
    if(pIf->CreateInstance(NULL,riid,ppv)==S_OK)
     rtn=(int)hinstLib;    
    pIf->Release();
    pIf=NULL;
   }
  }
        // Free the DLL module.
  
        if(!rtn)fFreeResult = FreeLibrary(hinstLib);
    }
 return rtn;
}

在vb中的使用方法,CrComObj传递的是UUID,CrComObj2传递的是String,

'函数声明
Private Declare Function CrComObj Lib "CrCom.dll" ( _
    ByVal lpDll As String, ByVal rclsid As Long, ByVal riid As Long, ByRef ppv As Any) As Long
Private Declare Function CrComObj2 Lib "CrCom.dll" ( _
    ByVal lpDll As String, ByVal strrclsid As Long, ByVal strriid As Long, ByRef ppv As Any) As Long

Dim tobj As olelib.IUnknown
Dim tobj2 As dllDemo.IDemo

hlib = CrComObj(App.Path & "\dllDemo.dll", VarPtr(ClsId_Obj), 0, tobj)
Set tobj2 = tobj
tobj2.Test

'或者

hlib=CrComObj2(App.Path & "\dllDemo.dll", StrPtr(ClsStr_Obj), 0, tobj)
Set tobj2 = tobj
tobj2.Test

CrComObj与CrComObj2返回的是LoadLibrary的返回值,必要的时候需要用FreeLibrary释放.

后记:
我的多页面浏览器LE中,也实现了不注册调用ActiveX Dll,我是直接使用了一本书(Advanced Visual Basic)的代码,代码颇长,似乎也挺复杂,原先使用的时候也不明所以然,后来终于搞清楚了,其原理是一样的,但是因为vb不支持函数指针,于是它花了很大力气去处理这个问题.相比而言,我觉得还是借用一下vc比较好,这样的话简捷的多.

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