[PATCH] comctl32: Always pass pcbRead to IStream_Read.

[Zebediah Figura]

On 7/30/19 1:09 PM, Vincent Povirk wrote:
> Signed-off-by: Vincent Povirk <vincent at codeweavers.com>
> ---
> pcbRead is a required argument. Windows Forms has an IStream
> implementation that depends on it:
> 
> https://github.com/madewokherd/winforms/blob/36684d6dfd994f2a06dd6ef5fa73e01869e085ec/src/Common/src/UnsafeNativeMethods.cs#L5820
> 

That's actually a bug in Mono, by my understanding. The CCW should be 
able to handle NULL return value pointers. I've sent a patch for it: 
<https://github.com/mono/mono/pull/15906>