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添加快捷键
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需要VB API函数：
GetAsyncKeyState ←判断函数调用时指定虚拟键的状态
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相关API声明：
GetAsyncKeyState
↓
Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vkey As Long) As Integer
Private Function MyHotKey(vKeyCode) As Boolean
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需要的控件：Timer（interval不为空）
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代码：
Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vkey As Long) As Integer
Private Function MyHotKey(vKeyCode) As Boolean
MyHotKey = (GetAsyncKeyState(vKeyCode) < 0)
End Function
'然后在循环中或Timer的Timer事件中检测:
Private Sub Timer1_Timer()
If MyHotKey(vbKeyA) And vbKeyControl Then 'ctrl+A
End '关闭
End If
'其中vbkeyA是键盘″A″的常数，其他键可按F1查得。
End Sub
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其它方法：
比如按下"ctrl+A"就退出!
'可以设置Form的KeyPreview属性为True，然后在Form_KeyDown事件中添加代码：
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
If KeyCode = Asc("A") And Shift = vbCtrlMask Then unload me '如果ctrl+A键被按下就退出
End Sub
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