The Open protocol function returns a EFI_FILE_PROTOCOL for the opened
file. You need to use that protocol instance to write, not the root file
system protocol.
From: Andrew Fish <af...@apple.com>
To: edk2-devel@lists.sourceforge.net,
Date: 05/22/2015 12:36 PM
Subject: Re: [edk2] write file in the USB Device
On May 22, 2015, at 12:24 PM, KSilva <kaleb.si...@iatecam.org.br> wrote:
Hello, I am trying write in file in the USB device, I am using the
protocol
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL with EFI_FILE_PROTOCOL,The file is create
and opened,but I don't get to write, in the file shows only first letter.
I did not see an issue in your code.
%s is Unicode not ASCII, since ASCII is %a, so I assume your file is
Unicode.
A is 0x0041 in EFI 16-bit Unicode so in bytes that is 0x41 0x00. If you
read a Unicode string as ASCII you get a NULL in the wrong place of the
string. So maybe the issue is in the way you are looking at the file you
wrote?
Thanks,
Andrew Fish
Someone help me?
Status = gBS->LocateHandleBuffer(ByProtocol,
&gSimpleFileProtocol,
NULL,
&numFile,
&fileHandle);
if(!EFI_ERROR(Status))
{
for(index = 0;index < numFile;index++)
{
Status = gBS->HandleProtocol(fileHandle[index],
&gSimpleFileProtocol,
(VOID **)&fileSystemProtocol);
if(!EFI_ERROR(Status))
{
Status = fileSystemProtocol->OpenVolume(fileSystemProtocol,
&root);
if(!EFI_ERROR(Status))
{
Print(L"\nTexto: %s",texto);
Status = root->Open(root,
&newHandle,
L"teste.txt",
EFI_FILE_MODE_CREATE | EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE,
0);
if(!EFI_ERROR(Status))
{
BufferSize = 128;
Print(L"Status root->Open(): %r\n", Status);
Status = root->Write(newHandle,
&BufferSize,
texto);
}
Print(L"\nStatus do Write: %r\n",Status);
root->Close(newHandle);
Print(L"\nstatus Close :%r\n",Status);
break;
}
}
}
}
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