在access中使用sendkeys有时会导致数字或大写指示灯无故熄灭，故安全的办法还是使用API函数。
但最好尽量少用sendkeys,因为有时因为键误操作导致错误。
作者：Dev Ashish
'******** Code Start ***********
' Declare Type for API call:
Private Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128 ' Maintenance string for PSS usage
End Type
' API declarations:
Private Declare Function GetVersionEx Lib "Kernel32" _
Alias "GetVersionExA" _
(lpVersionInformation As OSVERSIONINFO) As Long
Private Declare Sub keybd_event Lib "user32" _
(ByVal bVk As Byte, _
ByVal bScan As Byte, _
ByVal dwflags As Long, ByVal dwExtraInfo As Long)
Private Declare Function GetKeyboardState Lib "user32" _
(pbKeyState As Byte) As Long
Private Declare Function SetKeyboardState Lib "user32" _
(lppbKeyState As Byte) As Long
' Constant declarations:
Const VK_NUMLOCK = &H90
Const VK_SCROLL = &H91
Const VK_CAPITAL = &H14
Const KEYEVENTF_EXTENDEDKEY = &H1
Const KEYEVENTF_KEYUP = &H2
Const VER_PLATFORM_WIN32_NT = 2
Const VER_PLATFORM_WIN32_WINDOWS = 1
Function IsCapsLockOn() As Boolean
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
IsCapsLockOn = keys(VK_CAPITAL)
End Function
Sub ToggleCapsLock()
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
If o.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS Then '=====Win95
'Toggle capslock
keys(VK_CAPITAL) = Abs(Not keys(VK_CAPITAL))
SetKeyboardState keys(0)
ElseIf o.dwPlatformId = VER_PLATFORM_WIN32_NT Then '=====WinNT
'Simulate Key Press>
keybd_event VK_CAPITAL, &H45, KEYEVENTF_EXTENDEDKEY Or 0, 0
'Simulate Key Release
keybd_event VK_CAPITAL, &H45, KEYEVENTF_EXTENDEDKEY _
Or KEYEVENTF_KEYUP, 0
End If
End Sub
Function IsNumLockOn() As Boolean
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
IsNumLockOn = keys(VK_NUMLOCK)
End Function
Sub ToggleNumLock()
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
If o.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS Then '=====Win95
keys(VK_NUMLOCK) = Abs(Not keys(VK_NUMLOCK))
SetKeyboardState keys(0)
ElseIf o.dwPlatformId = VER_PLATFORM_WIN32_NT Then '=====WinNT
'Simulate Key Press
keybd_event VK_NUMLOCK, &H45, KEYEVENTF_EXTENDEDKEY Or 0, 0
'Simulate Key Release
keybd_event VK_NUMLOCK, &H45, KEYEVENTF_EXTENDEDKEY _
Or KEYEVENTF_KEYUP, 0
End If
End Sub
Function IsScrollLockOn()
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
IsScrollLockOn = keys(VK_SCROLL)
End Function
Sub ToggleScrollLock()
Dim o As OSVERSIONINFO
o.dwOSVersionInfoSize = Len(o)
GetVersionEx o
Dim keys(0 To 255) As Byte
GetKeyboardState keys(0)
If o.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS Then '=====Win95
keys(VK_SCROLL) = Abs(Not keys(VK_SCROLL))
SetKeyboardState keys(0)
ElseIf o.dwPlatformId = VER_PLATFORM_WIN32_NT Then '=====WinNT
'Simulate Key Press
keybd_event VK_SCROLL, &H45, KEYEVENTF_EXTENDEDKEY Or 0, 0
'Simulate Key Release
keybd_event VK_SCROLL, &H45, KEYEVENTF_EXTENDEDKEY Or KEYEVENTF_KEYUP, 0
End If
End Sub
Sub mySendKeys(sKeys As String, Optional bWait As Boolean = False)
Dim bNumLockState As Boolean
Dim bCapsLockState As Boolean
Dim bScrollLockState As Boolean
bNumLockState = IsNumLockOn()
bCapsLockState = IsCapsLockOn()
bScrollLockState = IsScrollLockOn()
SendKeys sKeys, bWait
If IsNumLockOn() <> bNumLockState Then
ToggleNumLock
End If
If IsCapsLockOn() <> bCapsLockState Then
ToggleCapsLock
End If
If IsScrollLockOn() <> bScrollLockState Then
ToggleScrollLock
End If
End Sub
Function fSendKeys(sKeys As String, Optional bWait As Boolean = False)
' Function to make it callable from macros
mySendKeys sKeys, bWait
End Function
'******** Code End ***********