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Date: Wed, 8 Feb 2023 10:00:05 +0000
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Subject: Re: [edk2-devel] Graphic Output on qemu
To: Alireza Banejad <alibanejad1376@gmail.com>
Cc: devel@edk2.groups.io, "Paul, Bill" <Bill.Paul@windriver.com>
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From: "Michael Brown" <mcb30@ipxe.org>
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On 08/02/2023 09:55, Alireza Banejad wrote:
> As my previous email, I mentioned that I am able to find the protocol 
> since the LocateProtocol returns 0 (EFI_SUCCESS) (using the exact code 
> you wrote) . But when I want to open it either with OpenProtocol or 
> HandleProtocol I get a RETURN_UNSUPPORTED. Are you implying that by 
> calling LocateProtocol() the protocol would also be opened?

LocateProtocol() gives you back a pointer to the protocol instance. 
There is no need for a separate "open" action: you can just immediately 
use the protocol instance that LocateProtocol() returns to you.

Michael