Create a Pop Up box in Hii(Human Interface Infrstructure)

u16 i;

EFI_INPUT_KEY                   Key;

DEBUG_PRINT (("Key scan.........\n"));

do {

    CreatePopUp (

        EFI_LIGHTGRAY | EFI_BACKGROUND_RED,

        &Key,

        L"",

        L"Would you like to create this virtual disk?",

        L"         [Yes]               [No]         ",

        L"",

        NULL

    );

    DEBUG_PRINT (("Unicode=0x%x, ScanCode=0x%x <%c>\n", Key.UnicodeChar, Key.ScanCode, Key.UnicodeChar));

} while ((Key.ScanCode != SCAN_ESC) && (Key.UnicodeChar != CHAR_CARRIAGE_RETURN));

Print Messages:

Unicode=0x79, ScanCode=0x0

Unicode=0x59, ScanCode=0x0

Unicode=0x6E, ScanCode=0x0

Unicode=0x4E, ScanCode=0x0

ScanCode=0x0(SCAN_NULL)

//

// EFI Console Colours

//

#define EFI_BLACK                 0x00

#define EFI_BLUE                  0x01

#define EFI_GREEN                 0x02

#define EFI_CYAN                  (EFI_BLUE | EFI_GREEN)

#define EFI_RED                   0x04

#define EFI_MAGENTA               (EFI_BLUE | EFI_RED)

#define EFI_BROWN                 (EFI_GREEN | EFI_RED)

#define EFI_LIGHTGRAY             (EFI_BLUE | EFI_GREEN | EFI_RED)

#define EFI_BRIGHT                0x08

#define EFI_DARKGRAY              (EFI_BRIGHT)

#define EFI_LIGHTBLUE             (EFI_BLUE | EFI_BRIGHT)

#define EFI_LIGHTGREEN            (EFI_GREEN | EFI_BRIGHT)

#define EFI_LIGHTCYAN             (EFI_CYAN | EFI_BRIGHT)

#define EFI_LIGHTRED              (EFI_RED | EFI_BRIGHT)

#define EFI_LIGHTMAGENTA          (EFI_MAGENTA | EFI_BRIGHT)

#define EFI_YELLOW                (EFI_BROWN | EFI_BRIGHT)

#define EFI_WHITE                 (EFI_BLUE | EFI_GREEN | EFI_RED | EFI_BRIGHT)

#define EFI_TEXT_ATTR(f, b)       ((f) | ((b) << 4))

#define EFI_BACKGROUND_BLACK      0x00

#define EFI_BACKGROUND_BLUE       0x10

#define EFI_BACKGROUND_GREEN      0x20

#define EFI_BACKGROUND_CYAN       (EFI_BACKGROUND_BLUE | EFI_BACKGROUND_GREEN)

#define EFI_BACKGROUND_RED        0x40

#define EFI_BACKGROUND_MAGENTA    (EFI_BACKGROUND_BLUE | EFI_BACKGROUND_RED)

#define EFI_BACKGROUND_BROWN      (EFI_BACKGROUND_GREEN | EFI_BACKGROUND_RED)

#define EFI_BACKGROUND_LIGHTGRAY  (EFI_BACKGROUND_BLUE | EFI_BACKGROUND_GREEN | EFI_BACKGROUND_RED)

//

// EFI Scan codes

//

#define SCAN_NULL       0x0000

#define SCAN_UP         0x0001

#define SCAN_DOWN       0x0002

#define SCAN_RIGHT      0x0003

#define SCAN_LEFT       0x0004

#define SCAN_HOME       0x0005

#define SCAN_END        0x0006

#define SCAN_INSERT     0x0007

#define SCAN_DELETE     0x0008

#define SCAN_PAGE_UP    0x0009

#define SCAN_PAGE_DOWN  0x000A

#define SCAN_F1         0x000B

#define SCAN_F2         0x000C

#define SCAN_F3         0x000D

#define SCAN_F4         0x000E

#define SCAN_F5         0x000F

#define SCAN_F6         0x0010

#define SCAN_F7         0x0011

#define SCAN_F8         0x0012

#define SCAN_F9         0x0013

#define SCAN_F10        0x0014

#define SCAN_F11        0x0015

#define SCAN_F12        0x0016

#define SCAN_ESC        0x0017