Re: LocateHandle for gEfiShellProtocolGuid is failing in my application

["Carsey, Jaben" <jaben.carsey@intel.com>]

Hi Keshava,

few questions: 
Is there a reason that you are not using ShellLib to facilitate your app functionality?  That library makes lots of things a lot easier.
Why do you use LocateHandle and not LocateProtocol?
Are you sure about that return code?  Usually most-sig-bit is set for error returns.

Does the following snippet of code find a valid instance?

    Status = gBS->LocateProtocol(
      &gEfiShellProtocolGuid,
      NULL,
      (VOID **)&gEfiShellProtocol
     );
    if (EFI_ERROR(Status)) {
      gEfiShellProtocol = NULL;
    }

Are you running the UEFI Shell and then your application?


-Jaben




> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> GN Keshava
> Sent: Tuesday, December 20, 2016 11:32 PM
> To: edk2-devel@lists.01.org
> Subject: [edk2] LocateHandle for gEfiShellProtocolGuid is failing in my
> application
> Importance: High
> 
> Hi,
> 
> I'm developing a shell application. A call to LocateHandle for
> gEfiShellProtocolGuid is failing with Status 0x0E.
> 
> Below is my code. Please let me know what I'm doing wrong.
> 
> Status = gBS->LocateHandle(ByProtocol, &gEfiShellProtocolGuid, NULL,
> &BufferSize, Buffer); // Get BufferSize
> if (EFI_ERROR(Status))
> Print(L"LocateHandle Status 0x%x\n",Status);
> 
> Status = gBS->AllocatePool(EfiBootServicesData, BufferSize,
> (void**)&Buffer);
> if (EFI_ERROR(Status))
> Print(L"AllocatePool Status 0x%x\n",Status);
> 
> Status = gBS->LocateHandle(ByProtocol, &gEfiShellProtocolGuid, NULL,
> &BufferSize, Buffer);
> if (EFI_ERROR(Status))
> Print(L"LocateHandle Status 0x%x\n",Status);
> 
> All calls failing with Status being 0x0E. Please help me to solve this. Is
> there any special requirement for using this protocol?
> 
> Thanks.
> Regards,
> Keshava
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