如何识别键盘左右的shift,Ctrl或Alt键

用API （GetAsyncKeyState）实现，在WIN 2K，XP 下有效：

Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer

Private Const VK_LSHIFT = &HA0

Private Const VK_RSHIFT = &HA1

Private Const VK_LCTRL = &HA2

Private Const VK_RCTRL = &HA3

Private Const VK_LMENU = &HA4

Private Const VK_RMENU = &HA5

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)

If KeyCode = vbKeyShift And Shift = vbShiftMask And (GetAsyncKeyState(VK_LSHIFT) And &H8000)

Then MsgBox "you click the Left Shift"

If KeyCode = vbKeyShift And Shift = vbShiftMask And (GetAsyncKeyState(VK_RSHIFT) And &H8000)

Then MsgBox "you click the RIGHT Shift"

If KeyCode = vbKeyMenu And Shift = vbAltMask And (GetAsyncKeyState(VK_LMENU) And &H8000)

Then MsgBox "you click the Left ALT" ' only ALT was pressed

If KeyCode = vbKeyMenu And Shift = vbAltMask And (GetAsyncKeyState(VK_RMENU) And &H8000)

Then MsgBox "you click the RIGHT ALT" ' only ALT was pressed

If KeyCode = vbKeyControl And Shift = vbCtrlMask And (GetAsyncKeyState(VK_LCTRL) And &H8000)

Then MsgBox "you click the Left CTRL"

If KeyCode = vbKeyControl And Shift = vbCtrlMask And (GetAsyncKeyState(VK_RCTRL) And &H8000)

Then MsgBox "you click the Right CTRL"

End Sub

Private Sub Form_Load()

Me.KeyPreview = True

End Sub