Re: LocateHandle for gEfiShellProtocolGuid is failing in my application

[Andrew Fish <afish@apple.com>]

> On Dec 20, 2016, at 11:32 PM, GN Keshava <keshava.gn@gmail.com> wrote:
> 
> 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);
> 

You can use %r with Print() to decode the error. 

https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Library/PrintLib.h <https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Library/PrintLib.h>
    - r
      - The argument is a RETURN_STATUS value.  This value is converted to 
        a string following the table below.  This does not follow ANSI C. 
      - RETURN_SUCCESS               
        - "Success"
      - RETURN_LOAD_ERROR            
        - "Load Error"
      - RETURN_INVALID_PARAMETER     
        - "Invalid Parameter"
      - RETURN_UNSUPPORTED           
        - "Unsupported"
      - RETURN_BAD_BUFFER_SIZE       
        - "Bad Buffer Size"
      - RETURN_BUFFER_TOO_SMALL      
        - "Buffer Too Small"
      - RETURN_NOT_READY             
        - "Not Ready"



Thanks,

Andrew Fish


> 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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