如何识别键盘左右的shift,Ctrl或Alt键

最新推荐文章于 2022-03-11 10:50:28 发布

最新推荐文章于 2022-03-11 10:50:28 发布 · 157 阅读

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该博客介绍了在WIN 2K和XP系统下，使用API（GetAsyncKeyState）实现按键检测的方法。通过声明函数和定义常量，在Form_KeyDown事件中判断左右Shift、ALT、CTRL键的点击情况，并给出相应提示，同时在Form_Load中设置KeyPreview为True。

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