用 VB 实现全局热键模块
在软件报以前的文章中，虽然也介绍了如何用 VB 实现全局热键的方法，但是这些文章都只是针对初学者学习技巧而用，而在真正的程序编写中是不适应的，为了使我们编写的程序有继承性、维护性因此有必要制作一个实现全局热键的模块。
请大家看看下面调用全局热键的示例：
激活 3 个热键：（注：SetHotkey 是我自定义的函数）
SetHotkey 1, "Ctrl,112", "Add"
按 Ctrl+F1 激活指定程序
SetHotkey 2, 113, "Add"
按 F2 激活指定程序
SetHotkey 3, "Ctrl+Alt,113", "Add"
按 Ctrl+Alt+F2 激活指定程序
'注：关于激活热键后的操作，由自定义函数 SetHotkey 的 KeyId 传送的值来判断
注销 3 个热键：
SetHotkey 1, "", "Del"
退出程序是一定要用上的，不然会导至程序死掉
SetHotkey 2, "", "Del"
SetHotkey 3, "", "Del"
请大家新建一个模块（.bas）文件，自定义 SetHotkey函数及其他，这样在以后的任何程序中只要调用此模块就可以了。
'本模块是有关热键操作的
Option Explicit
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function RegisterHotKey Lib "user32" (ByVal hwnd As Long, ByVal id As Long, ByVal fskey_Modifiers As Long, ByVal vk As Long) As Long
Private Declare Function UnregisterHotKey Lib "user32" (ByVal hwnd As Long, ByVal id As Long) As Long
Const WM_HOTKEY = &H312
Const MOD_ALT = &H1
Const MOD_CONTROL = &H2
Const MOD_SHIFT = &H4
Const GWL_WNDPROC = (-4)
'窗口函数的地址
Dim key_preWinProc As Long '用来保存窗口信息
Dim key_Modifiers As Long, key_uVirtKey As Long, key_idHotKey As Long
Dim key_IsWinAddress
As Boolean '是否取得窗口信息的判断 Function keyWndproc(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If Msg = WM_HOTKEY Then
Select Case wParam 'wParam 值就是 key_idHotKey
Case 1 '激活 3 个热键后,3 个热键所对应的操作,大家在其他的程序中，只要修改此处就可以了
MsgBox "aa"
Case 2
MsgBox "bb"
Case 3
MsgBox "cc"
End Select
End If
'将消息传送给指定的窗口
keyWndproc = CallWindowProc(key_preWinProc, hwnd, Msg, wParam, lParam)
End Function
Function SetHotkey(ByVal KeyId As Long, ByVal KeyAss0 As String, ByVal Action As String)
Dim KeyAss1 As Long
Dim KeyAss2 As String
Dim i As Long
i = InStr(1, KeyAss0, ",")
If i = 0 Then
KeyAss1 = Val(KeyAss0)
KeyAss2 = ""
Else
KeyAss1 = Right(KeyAss0, Len(KeyAss0) - i)
KeyAss2 = Left(KeyAss0, i - 1)
End If
key_idHotKey = 0
key_Modifiers = 0
key_uVirtKey = 0
If key_IsWinAddress = False Then
'判断是否需要取得窗口信息，如果重复取得,再最后恢复窗口时，将会造成程序死掉
'记录原来的window程序地址
key_preWinProc = GetWindowLong(Form1.hwnd, GWL_WNDPROC)
'用自定义程序代替原来的window程序
SetWindowLong Form1.hwnd, GWL_WNDPROC, AddressOf keyWndproc
End If
key_idHotKey = KeyId
Select Case Action
Case "Add"
If KeyAss2 = "Ctrl" Then key_Modifiers = MOD_CONTROL
If KeyAss2 = "Alt" Then key_Modifiers = MOD_ALT
If KeyAss2 = "Shift" Then key_Modifiers = MOD_SHIFT
If KeyAss2 = "Ctrl+Alt" Then key_Modifiers = MOD_CONTROL + MOD_ALT
If KeyAss2 = "Ctrl+Shift" Then key_Modifiers = MOD_CONTROL + MOD_SHIFT
If KeyAss2 = "Ctrl+Alt+Shift" Then key_Modifiers = MOD_CONTROL + MOD_ALT + MOD_SHIFT
If KeyAss2 = "Shift+Alt" Then key_Modifiers = MOD_SHIFT + MOD_ALT
key_uVirtKey = Val(KeyAss1)
RegisterHotKey Form1.hwnd, key_idHotKey, key_Modifiers, key_uVirtKey '向窗口注册系统热键
key_IsWinAddress = True '不需要再取得窗口信息
Case "Del"
SetWindowLong Form1.hwnd, GWL_WNDPROC, key_preWinProc '恢复窗口信息
UnregisterHotKey Form1.hwnd, key_uVirtKey '取消系统热键
key_IsWinAddress = False '可以再次取得窗口信息
End Select
End Function |
