How do I pass a handle of DXGI shared resource to another process?

Question

https://msdn.microsoft.com/en-us/library/windows/desktop/bb174562(v=vs.85).aspx

According to the documentation of IDXGIResource::GetSharedHandle, I should be able to "marshal this handle to another process to share a resource with a device in another process".

But it's not clear how to pass this handle. Can I just pass the value of this handle to another process? Or do I need some specific method?

Thanks!

Yes, you can pass this handle directly to another process and access it via OpenSharedResource function. — VuVirt, Mar 01 '17 at 12:43

score 3 · Answer 1 · answered Nov 11 '19 at 16:00

3

Microsoft's documentation now suggests using CreateSharedHandle() instead of GetSharedHandle() and creating the texture with D3D11_RESOURCE_MISC_SHARED_NTHANDLE. I had to call DuplicateHandle() in order to pass the created HANDLE to another process to be opened with OpenSharedResource1().

answered Nov 11 '19 at 16:00

BradGrantham

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CreateSharedHandle() requires IDXGIResource1 – thewhiteambit Aug 07 '21 at 15:21
I'm having some difficulties with this. I'm curious why you needed to use `DuplicateHandle()`, when others say they can use the handle directly in the other process? – sleep Mar 24 '22 at 03:25
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@JarrodSmith, CreateSharedHandle returns a "NT" handle which is local to the process, but can be passed to a different process via DuplicateHandle. On the other hand, GetSharedHandle returns a completely different, OS-global handle that can be directly (as a numerical value) used in all processes. To confuse matters, they both use the same C type for the handle. – Andrzej Szombierski Oct 14 '22 at 17:15

score 2 · Accepted Answer · answered Mar 13 '17 at 07:17

2

Yes, you can pass this handle directly to another process and access it via OpenSharedResource function.

answered Mar 13 '17 at 07:17

VuVirt

1,887
11
13

How do I pass a handle of DXGI shared resource to another process?

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