怎么使用backspace键响应的消息

键盘上每个键都有虚拟码的，你查查虚拟码表就可以找到

VK_LBUTTON

The left mouse button

VK_RBUTTON

The right mouse button

VK_CANCEL

The Cancel virtual key, used for control-break processing

VK_MBUTTON

The middle mouse button

VK_BACK

Backspace

VK_TAB

Tab

VK_CLEAR

5 (keypad without Num Lock)

VK_RETURN

Enter

VK_SHIFT

Shift (either one)

VK_CONTROL

Ctrl (either one)

VK_MENU

Alt (either one)

VK_PAUSE

Pause

VK_CAPITAL

Caps Lock

VK_ESCAPE

Esc

VK_SPACE

Spacebar

VK_PRIOR

Page Up

VK_NEXT

Page Down

VK_END

End

VK_HOME

Home

VK_LEFT

Left Arrow

VK_UP

Up Arrow

VK_RIGHT

Right Arrow

VK_DOWN

Down Arrow

VK_SELECT

Select

VK_PRINT

Print (only used by Nokia keyboards)

VK_EXECUTE

Execute (not used)

VK_SNAPSHOT

Print Screen

VK_INSERT

Insert

VK_DELETE

Delete

VK_HELP

Help

VK_0

0

VK_1

1

VK_2

2

VK_3

3

VK_4

4

VK_5

5

VK_6

6

VK_7

7

VK_8

8

VK_9

9

VK_A

A

VK_B

B

VK_C

C

VK_D

D

VK_E

E

VK_F

F

VK_G

G

VK_H

H

VK_I

I

VK_J

J

VK_K

K

VK_L

L

VK_M

M

VK_N

N

VK_O

O

VK_P

P

VK_Q

Q

VK_R

R

VK_S

S

VK_T

T

VK_U

U

VK_V

V

VK_W

W

VK_X

X

VK_Y

Y

VK_Z

Z

VK_STARTKEY

Start Menu key

VK_CONTEXTKEY

Context Menu key

VK_NUMPAD0

0 (keypad with Num Lock)

VK_NUMPAD1

1 (keypad with Num Lock)

VK_NUMPAD2

2 (keypad with Num Lock)

VK_NUMPAD3

3 (keypad with Num Lock)

VK_NUMPAD4

4 (keypad with Num Lock)

VK_NUMPAD5

5 (keypad with Num Lock)

VK_NUMPAD6

6 (keypad with Num Lock)

VK_NUMPAD7

7 (keypad with Num Lock)

VK_NUMPAD8

8 (keypad with Num Lock)

VK_NUMPAD9

9 (keypad with Num Lock)

VK_MULTIPLY

* (keypad)

VK_ADD

+ (keypad)

VK_SEPARATER

Separator (never generated by the keyboard)

VK_DECIMAL

. (keypad with Num Lock)

VK_DIVIDE

/ (keypad)

VK_F1

F1

VK_F2

F2

VK_F3

F3

VK_F4

F4

VK_F5

F5

VK_F6

F6

VK_F7

F7

VK_F8

F8

VK_F9

F9

VK_F10

F10

VK_F11

F11

VK_F12

F12

VK_F13

F13

VK_F14

F14

VK_F15

F15

VK_F16

F16

VK_F17

F17

VK_F18

F18

VK_F19

F19

VK_F20

F20

VK_F21

F21

VK_F22

F22

VK_F23

F23

VK_F24

F24

VK_NUMLOCK

Num Lock

VK_OEM_SCROLL

Scroll Lock

VK_OEM_1

;

VK_OEM_PLUS

=

VK_OEM_COMMA

,

VK_OEM_MINUS

-

VK_OEM_PERIOD

.

VK_OEM_2

/

VK_OEM_3

`

VK_OEM_4

[

VK_OEM_5

VK_OEM_6

]

VK_OEM_7

"

VK_OEM_8

(unknown)

VK_ICO_F17

F17 on Olivetti extended keyboard (internal use only)

VK_ICO_F18

F18 on Olivetti extended keyboard (internal use only)

VK_OEM_102

< or | on IBM-compatible 102 enhanced non-U.S. keyboard

VK_ICO_HELP

Help on Olivetti extended keyboard (internal use only)

VK_ICO_00

00 on Olivetti extended keyboard (internal use only)

VK_ICO_CLEAR

Clear on Olivette extended keyboard (internal use only)

VK_OEM_RESET

Reset (Nokia keyboards only)

VK_OEM_JUMP

Jump (Nokia keyboards only)

VK_OEM_PA1

PA1 (Nokia keyboards only)

VK_OEM_PA2

PA2 (Nokia keyboards only)

VK_OEM_PA3

PA3 (Nokia keyboards only)

VK_OEM_WSCTRL

WSCTRL (Nokia keyboards only)

VK_OEM_CUSEL

CUSEL (Nokia keyboards only)

VK_OEM_ATTN

ATTN (Nokia keyboards only)

VK_OEM_FINNISH

FINNISH (Nokia keyboards only)

VK_OEM_COPY

COPY (Nokia keyboards only)

VK_OEM_AUTO

AUTO (Nokia keyboards only)

VK_OEM_ENLW

ENLW (Nokia keyboards only)

VK_OEM_BACKTAB

BACKTAB (Nokia keyboards only)

VK_ATTN

ATTN

VK_CRSEL

CRSEL

VK_EXSEL

EXSEL

VK_EREOF

EREOF

VK_PLAY

PLAY

VK_ZOOM

ZOOM

VK_NONAME

NONAME

VK_PA1

PA1

VK_OEM_CLEAR

CLEAR

Constant Definitions

Const VK_LBUTTON = &H1

Const VK_RBUTTON = &H2

Const VK_CANCEL = &H3

Const VK_MBUTTON = &H4

Const VK_BACK = &H8

Const VK_TAB = &H9

Const VK_CLEAR = &HC

Const VK_RETURN = &HD

Const VK_SHIFT = &H10

Const VK_CONTROL = &H11

Const VK_MENU = &H12

Const VK_PAUSE = &H13

Const VK_CAPITAL = &H14

Const VK_ESCAPE = &H1B

Const VK_SPACE = &H20

Const VK_PRIOR = &H21

Const VK_NEXT = &H22

Const VK_END = &H23

Const VK_HOME = &H24

Const VK_LEFT = &H25

Const VK_UP = &H26

Const VK_RIGHT = &H27

Const VK_DOWN = &H28

Const VK_SELECT = &H29

Const VK_PRINT = &H2A

Const VK_EXECUTE = &H2B

Const VK_SNAPSHOT = &H2C

Const VK_INSERT = &H2D

Const VK_DELETE = &H2E

Const VK_HELP = &H2F

Const VK_0 = &H30

Const VK_1 = &H31

Const VK_2 = &H32

Const VK_3 = &H33

Const VK_4 = &H34

Const VK_5 = &H35

Const VK_6 = &H36

Const VK_7 = &H37

Const VK_8 = &H38

Const VK_9 = &H39

Const VK_A = &H41

Const VK_B = &H42

Const VK_C = &H43

Const VK_D = &H44

Const VK_E = &H45

Const VK_F = &H46

Const VK_G = &H47

Const VK_H = &H48

Const VK_I = &H49

Const VK_J = &H4A

Const VK_K = &H4B

Const VK_L = &H4C

Const VK_M = &H4D

Const VK_N = &H4E

Const VK_O = &H4F

Const VK_P = &H50

Const VK_Q = &H51

Const VK_R = &H52

Const VK_S = &H53

Const VK_T = &H54

Const VK_U = &H55

Const VK_V = &H56

Const VK_W = &H57

Const VK_X = &H58

Const VK_Y = &H59

Const VK_Z = &H5A

Const VK_STARTKEY = &H5B

Const VK_CONTEXTKEY = &H5D

Const VK_NUMPAD0 = &H60

Const VK_NUMPAD1 = &H61

Const VK_NUMPAD2 = &H62

Const VK_NUMPAD3 = &H63

Const VK_NUMPAD4 = &H64

Const VK_NUMPAD5 = &H65

Const VK_NUMPAD6 = &H66

Const VK_NUMPAD7 = &H67

Const VK_NUMPAD8 = &H68

Const VK_NUMPAD9 = &H69

Const VK_MULTIPLY = &H6A

Const VK_ADD = &H6B

Const VK_SEPARATOR = &H6C

Const VK_SUBTRACT = &H6D

Const VK_DECIMAL = &H6E

Const VK_DIVIDE = &H6F

Const VK_F1 = &H70

Const VK_F2 = &H71

Const VK_F3 = &H72

Const VK_F4 = &H73

Const VK_F5 = &H74

Const VK_F6 = &H75

Const VK_F7 = &H76

Const VK_F8 = &H77

Const VK_F9 = &H78

Const VK_F10 = &H79

Const VK_F11 = &H7A

Const VK_F12 = &H7B

Const VK_F13 = &H7C

Const VK_F14 = &H7D

Const VK_F15 = &H7E

Const VK_F16 = &H7F

Const VK_F17 = &H80

Const VK_F18 = &H81

Const VK_F19 = &H82

Const VK_F20 = &H83

Const VK_F21 = &H84

Const VK_F22 = &H85

Const VK_F23 = &H86

Const VK_F24 = &H87

Const VK_NUMLOCK = &H90

Const VK_OEM_SCROLL = &H91

Const VK_OEM_1 = &HBA

Const VK_OEM_PLUS = &HBB

Const VK_OEM_COMMA = &HBC

Const VK_OEM_MINUS = &HBD

Const VK_OEM_PERIOD = &HBE

Const VK_OEM_2 = &HBF

Const VK_OEM_3 = &HC0

Const VK_OEM_4 = &HDB

Const VK_OEM_5 = &HDC

Const VK_OEM_6 = &HDD

Const VK_OEM_7 = &HDE

Const VK_OEM_8 = &HDF

Const VK_ICO_F17 = &HE0

Const VK_ICO_F18 = &HE1

Const VK_OEM102 = &HE2

Const VK_ICO_HELP = &HE3

Const VK_ICO_00 = &HE4

Const VK_ICO_CLEAR = &HE6

Const VK_OEM_RESET = &HE9

Const VK_OEM_JUMP = &HEA

Const VK_OEM_PA1 = &HEB

Const VK_OEM_PA2 = &HEC

Const VK_OEM_PA3 = &HED

Const VK_OEM_WSCTRL = &HEE

Const VK_OEM_CUSEL = &HEF

Const VK_OEM_ATTN = &HF0

Const VK_OEM_FINNISH = &HF1

Const VK_OEM_COPY = &HF2

Const VK_OEM_AUTO = &HF3

Const VK_OEM_ENLW = &HF4

Const VK_OEM_BACKTAB = &HF5

Const VK_ATTN = &HF6

Const VK_CRSEL = &HF7

Const VK_EXSEL = &HF8

Const VK_EREOF = &HF9

Const VK_PLAY = &HFA

Const VK_ZOOM = &HFB

Const VK_NONAME = &HFC

Const VK_PA1 = &HFD

Const VK_OEM_CLEAR = &HFE