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      首頁 > 編程開發 > vb >
      • vb教程之如何攔截鍵盤輸入

      • 2017-09-21 16:32 來源:未知
       這是使用Keyboard Hook 的范例,它的解釋請查VB5 Call WinAPI技巧或Hook的簡介 
      '以下在.Bas 
      Option Explicit 

      Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long 
      Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long 
      Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal ncode As Long, ByVal wParam As Long, lParam As Any) As Long 

      Public hnexthookproc As Long 
      Public Const HC_ACTION = 0 
      Public Const WH_KEYBOARD = 2 

      Public Sub UnHookKBD() 
      If hnexthookproc <> 0 Then 
      UnhookWindowsHookEx hnexthookproc 
      hnexthookproc = 0 
      End If 
      End Sub 
      Public Function EnableKBDHook() 
      If hnexthookproc <> 0 Then 
      Exit Function 
      End If 
      hnexthookproc = SetWindowsHookEx(WH_KEYBOARD, AddressOf _ 
      MyKBHFunc, App.hInstance, 0) 
      If hnexthookproc <> 0 Then 
      EnableKBDHook = hnexthookproc 
      End If 
      End Function 
      Public Function MyKBHFunc(ByVal iCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long 
      '這三個參數是固定的,不能動,而MyKBHFunc這個名稱只要和 
      'SetWindowsHookex()中 AddressOf後的名稱一樣便可,不一定叫什麼 
      'wParam 是傳入按了哪個key的virtual-key code 

      '如果您將以下的兩行unmark則所有鍵盤的輸入皆沒有作用 
      'MyKBHFunc = 1 '吃掉信息 
      'Exit Function 

      MyKBHFunc = 0 '信息要處理 
      If iCode < 0 Then 
      MyKBHFunc = CallNextHookEx(hnexthookproc, iCode, wParam, lParam) 
      Exit Function 
      End If 
      If wParam = vbKeySnapshot Then '偵測 有沒有按到PrintScreen鍵 
      MyKBHFunc = 1 '在這個Hook便吃掉這個信息 
      Debug.Print "haha" 
      Else 
      Call CallNextHookEx(hnexthookproc, iCode, wParam, lParam) 
      End If 
      End Function 

      '以下在Form 
      Private Sub Form_Load() 
      Call EnableKBDHook 
      End Sub 

      Private Sub Form_Unload(Cancel As Integer) 
      Call UnHookKBD 
      End Sub
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