VBA：通過API函數，調用計算器，模擬按鍵等操作

Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Public Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Const WM_CLOSE = &H10
Public Const WM_KEYDOWN = &H100
Public Const WM_KEYUP = &H101
Public Const WM_SETTEXT = &HC

Sub work()
    Shell "Calc.exe" '打開計算器
    hwnd = FindWindow("CalcFrame", "計算器") '查找句柄
    ShowWindow hwnd, 1 '顯示窗口
    SetForegroundWindow hwnd '切換爲前置活動窗口（需和上一條搭配使用）
    Sleep 1000 '休息1秒鐘
    
    hwnd_txt = FindWindowEx(hwnd, 0, "CalcFrame", "")
    
    PostMessage hwnd, WM_KEYUP, 54, 0 '數字6
    Sleep 1000 '休息1秒鐘
    
    PostMessage hwnd, WM_KEYUP, 189, 0 '-
    Sleep 1000 '休息1秒鐘
    
    PostMessage hwnd, WM_KEYUP, 49, 0 '數字1
    Sleep 1000 '休息1秒鐘
    
    PostMessage hwnd, WM_KEYUP, 187, 0 '=
    Sleep 1000 '休息1秒鐘
    
    SendMessage hwnd, WM_CLOSE, 0&, 0& '關閉計算器
End Sub