一、修改protocol.c

#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <stdio.h>EFI_STATUS
EFIAPI
UefiMain(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE *SystemTable
) {EFI_STATUS Status = EFI_SUCCESS;UINTN NoHandles = 0;EFI_HANDLE *Buffer = NULL;Status = gBS->LocateHandleBuffer(ByProtocol,&gEfiGraphicsOutputProtocolGuid,NULL,&NoHandles,&Buffer);Print(L"Status = %d", Status);if (EFI_ERROR(Status)) {Print(L"Failed to LocateHandleBuffer. \n");return Status;}Print(L"Hello, Protocol\n");EFI_GRAPHICS_OUTPUT_PROTOCOL *Gop;Status = gBS->OpenProtocol(Buffer[0],&gEfiGraphicsOutputProtocolGuid,(VOID**)&Gop,ImageHandle,NULL,EFI_OPEN_PROTOCOL_GET_PROTOCOL);Print(L"Status = %d", Status);if (EFI_ERROR(Status)) {Print(L"Failed to OpenProtocol. \n");return Status;}UINTN SizeOfInfo = 0;EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;UINTN i = 0;for (; i < Gop->Mode->MaxMode; i++) {Status = Gop->QueryMode(Gop, i, &SizeOfInfo, &Info);if (EFI_ERROR(Status)) {Print(L"Failed to Querymode. \n");return Status;}PrintL(L"Mode %d, H = %d, V = %d", i, Info->HorizontalResolution, Info->VerticalResolution);}Status = Gop->SetMode(Gop, 22);if (EFI_ERROR(Status)) {Print(L"Failed to Querymode. \n");return Status;}EFI_GRAPHICS_OUTPUT_BLT_PIXEL Red = {0, 0, 255, 0};Gop->Blt(Gop,&Red,EfiBltVideoFill,0,0,   // source x y0,0,100,100,  // wid  height0);if (EFI_ERROR(Status)) {Print(L"Failed to Blt. \n");return Status;}Gop->Blt(Gop,&Red,EfiBltVideoFill,0,0,   // source x y200, 200,100,100,  // wid  height0);  // copyif (EFI_ERROR(Status)) {Print(L"Failed to Blt. \n");return Status;}return Status;
}

二、build