Step to UEFI (50) ----- 实现一个简单的菜单功能

屏幕显示功能搭配取按键信息的功能可以实现一个简单的菜单,用户可以使用上下键移动后选项,回车确认,ESC退出。

代码本身不复杂

#include  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/ShellCEntryLib.h>

#include  <stdio.h>
#include  <stdlib.h>
#include  <wchar.h>
#include  <time.h>
#include <Protocol/EfiShell.h>
#include <Library/ShellLib.h>

#include <Protocol/SimpleFileSystem.h>
#include <Protocol/BlockIo.h>
#include <Library/DevicePathLib.h>
#include <Library/HandleParsingLib.h>
#include <Library/SortLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>

extern EFI_BOOT_SERVICES         *gBS;
extern EFI_SYSTEM_TABLE			 *gST;
extern EFI_RUNTIME_SERVICES 	 *gRT;

extern EFI_SHELL_ENVIRONMENT2    *mEfiShellEnvironment2;
extern EFI_HANDLE				 gImageHandle;

//
// EFI Scan codes 
// copied from \EdkCompatibilityPkg\Foundation\Efi\Protocol\SimpleTextIn\SimpleTextIn.h
//
#define SCAN_NULL       0x0000
#define SCAN_UP         0x0001
#define SCAN_DOWN       0x0002
#define SCAN_ESC        0x0017
#define CHAR_CARRIAGE_RETURN  0x000D

#define	POSX 7
#define	POSY 3
#define NUM  5
CHAR16 HELPSTR[40]=L"UP/DOWN, ENTER , ESC";
CHAR16 ITEM[NUM][20]= {
				L"Item1 MOVSXX",
				L"Item2 CPUID",
				L"Item3 RETF",
				L"Item4 PUSHF",
				L"Item5 SUB"
				};

int
EFIAPI
main (                                         
  IN int Argc,
  IN char **Argv
  )
{

  EFI_INPUT_KEY	Key;
  EFI_STATUS		Status;
  int current=0;
  int i;
  
  gST -> ConOut ->ClearScreen(gST->ConOut);
 
  ShellPrintEx(POSX-3,POSY-1,L"%N%S",HELPSTR);
  ShellPrintEx(POSX,POSY,L"%H%S",ITEM[0]);
  for (i=1;i<NUM;i++) 
	{
    ShellPrintEx(POSX,POSY+i,L"%N%S",ITEM[i]);
	}
	
  Key.ScanCode=SCAN_NULL;
  while (SCAN_ESC!=Key.ScanCode)
    {
		Status= gST -> ConIn -> ReadKeyStroke(gST->ConIn,&Key);	
		if (Status == EFI_SUCCESS)	{
			ShellPrintEx(POSX,POSY+current,L"%N%S",ITEM[current]);
			if (SCAN_UP == Key.ScanCode) {current = (current-1+NUM)%NUM;}
			if (SCAN_DOWN == Key.ScanCode) {current = (current+1)%NUM;}
			ShellPrintEx(POSX,POSY+current,L"%H%S",ITEM[current]);			
			ShellPrintEx(POSX,POSY+NUM,L"Current[%d] Scancode[%d] UnicodeChar[%x] \n\r",current,Key.ScanCode,Key.UnicodeChar);		
		}
		if (CHAR_CARRIAGE_RETURN == Key.UnicodeChar) {
			ShellPrintEx(POSX,POSY+NUM+1,L"You have chosen: %N%S",ITEM[current]);
			break;
		}
	};	

  return EFI_SUCCESS;
}

 

运行结果:

smenu

工作视频:

完整的代码下载:

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