Re: Is it normal that the COM vtbl structure cannot be aligned between Windows and Wine

[Zhiyi Zhang]

On 6/11/25 20:16, zhengxianwei wrote:
> In wine, Visual2Vtbl 
>
> ```
> typedef struct IDCompositionVisual2Vtbl {
>     BEGIN_INTERFACE
>
>     /*** IUnknown methods ***/
>     HRESULT (STDMETHODCALLTYPE *QueryInterface)(
>         IDCompositionVisual2 *This,
>         REFIID riid,
>         void **ppvObject);
>
>     ULONG (STDMETHODCALLTYPE *AddRef)(
>         IDCompositionVisual2 *This);
>
>     ULONG (STDMETHODCALLTYPE *Release)(
>         IDCompositionVisual2 *This);
>
>     /*** IDCompositionVisual methods ***/
>     HRESULT (STDMETHODCALLTYPE *SetOffsetX)(
>         IDCompositionVisual2 *This,
>         float offset_x);
>
>     HRESULT (STDMETHODCALLTYPE *SetOffsetXAnimation)(
>         IDCompositionVisual2 *This,
>         IDCompositionAnimation *animation);
>
>     HRESULT (STDMETHODCALLTYPE *SetOffsetY)(
>         IDCompositionVisual2 *This,
>         float offset_y);
> ```
>
> setOffsetX (float *) at offset 0x18
> visual2vtbl.png
> But in windows 0x18 is setOffsetX (Animation *)

This screenshot is from disassembling native dcomp.dll. You are not allowed to do this if you want to
send your patches to Wine.
> Is this correct?