请问如何判断 键盘的 Caps Lock的状态，即现在是 小写输入状态还是大写输入状态？

[skywen]

2）使用AppActivate 时，如何在激活应用程序的同时，使其窗口获得焦点。






谢谢！

[TechnoFantasy]

使用API函数GetKeyboardState可以得到任何键的状态。

[TechnoFantasy]

Function CapsLock() As Boolean
CapsLock = (GetKeyState(VK_CAPITAL) And 1 = 1)
End Function

Private Sub Form_Load()
If CapsLock() = 1 Then Label1 = "On" Else Label1 = "Off"
End Sub

Private Sub cmdToggle_Click()
GetKeyboardState kbArray
kbArray.kbByte(VK_CAPITAL) = _
IIf(kbArray.kbByte(VK_CAPITAL) = 1, 0, 1)
SetKeyboardState kbArray

If CapsLock() Then
Label1.Caption = "On"
Else
Label1.Caption = "Off"
End If
End Sub

Private Sub cmdTurnOn_Click()
GetKeyboardState kbArray
kbArray.kbByte(VK_CAPITAL) = 1
SetKeyboardState kbArray

If CapsLock() Then
Label1.Caption = "On"
Else
Label1.Caption = "Off"
End If
End Sub

Private Sub cmdTurnOff_Click()
GetKeyboardState kbArray
kbArray.kbByte(VK_CAPITAL) = 0
SetKeyboardState kbArray

If CapsLock() Then
Label1.Caption = "On"
Else
Label1.Caption = "Off"
End If
End Sub

[lxcc]

Private Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer


Private Sub Command1_Click()
MsgBox CBool(GetKeyState(vbKeyCapital) And 1)
End Sub

[liul17]

给你个例子看看

'In a module
Public Const DT_CENTER = &H1
Public Const DT_WORDBREAK = &H10
Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Declare Function DrawTextEx Lib "user32" Alias "DrawTextExA" (ByVal hDC As Long, ByVal lpsz As String, ByVal n As Long, lpRect As RECT, ByVal un As Long, ByVal lpDrawTextParams As Any) As Long
Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long
Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Global Cnt As Long, sSave As String, sOld As String, Ret As String
Dim Tel As Long
Function GetPressedKey() As String
For Cnt = 32 To 128
'Get the keystate of a specified key
If GetAsyncKeyState(Cnt) <> 0 Then
GetPressedKey = Chr$(Cnt)
Exit For
End If
Next Cnt
End Function
Sub TimerProc(ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long)
Ret = GetPressedKey
If Ret <> sOld Then
sOld = Ret
sSave = sSave + sOld
End If
End Sub
'In a form
Private Sub Form_Load()
Me.Caption = "Key Spy"
'Create an API-timer
SetTimer Me.hwnd, 0, 1, AddressOf TimerProc
End Sub
Private Sub Form_Paint()
Dim R As RECT
Const mStr = "Start this project, go to another application, type something, switch back to this application and unload the form. If you unload the form, a messagebox with all the typed keys will be shown."
'Clear the form
Me.Cls
'API uses pixels
Me.ScaleMode = vbPixels
'Set the rectangle's values
SetRect R, 0, 0, Me.ScaleWidth, Me.ScaleHeight
'Draw the text on the form
DrawTextEx Me.hDC, mStr, Len(mStr), R, DT_WORDBREAK Or DT_CENTER, ByVal 0&
End Sub
Private Sub Form_Resize()
Form_Paint
End Sub
Private Sub Form_Unload(Cancel As Integer)
'Kill our API-timer
KillTimer Me.hwnd, 0
'Show all the typed keys
MsgBox sSave
End Sub

下面是getkeystate函数的帮助说明

GetKeyState

VB声明
Declare Function GetKeyState Lib "user32" Alias "GetKeyState" (ByVal nVirtKey As Long) As Integer
说明
针对已处理过的按键，在最近一次输入信息时，判断指定虚拟键的状态
返回值
Integer，如开关键打开，则位0设为1（开关键包括CapsLock， NumLock，ScrollLock）；如某个键当时正处于按下状态，则位15为1；如已经抬起，则为0
参数表
参数 类型及说明
nVirtKey Long，欲测试的虚拟键键码。对字母、数字字符（A-Z、a-z、0-9），用它们实际的ASCII值

[飘零风]

获得CapsLock状态

Private Declare Function GetKeyboardState Lib "user32" (ByVal pbKeyState As String) As Boolean

Private Sub Command1_Click()
Dim KeyMap As String * 256
Dim keystate As String

KeyMap = String(255, 0)
If GetKeyboardState(KeyMap) Then
keystate = Mid(KeyMap, &H15, 1)
MsgBox iif(Asc(keystate)=1,"按下了CapsLock","没有按下CapsLock")
End If
End Sub