shlwapi: Reimplement IUnknown_CPContainerInvokeParam on top of SHPackDispParams.

dlls/shlwapi/ordinal.c

@@ -2986,64 +2986,27 @@ HRESULT WINAPIV IUnknown_CPContainerInvokeParam(
   HRESULT result;
   IConnectionPoint *iCP;
   IConnectionPointContainer *iCPC;
+  DISPPARAMS dispParams = {buffer, NULL, cParams, 0};
+  va_list valist;
 
   if (!container)
     return E_NOINTERFACE;
 
   result = IUnknown_QueryInterface(container, &IID_IConnectionPointContainer,(LPVOID*) &iCPC);
-  if (SUCCEEDED(result))
-  {
+  if (FAILED(result))
+      return result;
+
   result = IConnectionPointContainer_FindConnectionPoint(iCPC, riid, &iCP);
   IConnectionPointContainer_Release(iCPC);
-  }
-
-  if (SUCCEEDED(result))
-  {
-    ULONG cnt;
-    VARIANTARG *curvar = buffer+cParams-1;
-    DISPPARAMS dispParams = {buffer, NULL, cParams, 0};
-    va_list valist;
+  if(FAILED(result))
+      return result;
 
   va_start(valist, cParams);
-    for(cnt=cParams;cnt>0;cnt--,curvar--) /* backwards for some reason */
-    {
-      enum VARENUM vt = va_arg(valist, enum VARENUM);
-      memset(curvar, 0, sizeof(*curvar));
-      if (vt & VT_BYREF)
-      {
-        V_VT(curvar) = vt;
-        V_BYREF(curvar) = va_arg(valist, LPVOID);
-      } else
-        switch(vt)
-        {
-        case VT_BSTR:
-          V_VT(curvar) = vt;
-          V_BSTR(curvar) = va_arg(valist, BSTR);
-          break;
-        case VT_DISPATCH:
-          V_VT(curvar) = vt;
-          V_DISPATCH(curvar) = va_arg(valist, IDispatch*);
-          break;
-        case VT_BOOL:
-          V_VT(curvar) = vt;
-          V_BOOL(curvar) = va_arg(valist, int);
-          break;
-        case VT_UNKNOWN:
-          V_VT(curvar) = vt;
-          V_UNKNOWN(curvar) = va_arg(valist, IUnknown*);
-          break;
-        case VT_I4:
-        default:
-          V_VT(curvar) = VT_I4;
-          V_I4(curvar) = va_arg(valist, LONG);
-          break;
-        }
-    }
+  SHPackDispParamsV(&dispParams, buffer, cParams, valist);
   va_end(valist);
 
   result = SHLWAPI_InvokeByIID(iCP, riid, dispId, &dispParams);
   IConnectionPoint_Release(iCP);
-  }
 
   return result;
 }