Option Explicit
Private Declare Function GetMenu Lib "user32.dll" (ByVal hwnd As Long) As Long
Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetMenuItemID Lib "user32.dll" (ByVal hMenu As Long, ByVal nPos As Long) As Long
Private Declare Function GetSubMenu Lib "user32.dll" (ByVal hMenu As Long, ByVal nPos As Long) As Long
Private Const WM_COMMAND As Long = &H111
Private Sub Command1_Click()
Dim h1 As Long, h2 As Long, id As Long
h1 = FindWindow("Notepad", vbNullString) '記事本的句柄
h2 = GetMenu(h1)
h2 = GetSubMenu(h2, 0) '"檔案"菜單的句柄
id = GetMenuItemID(h2, 0) '子菜單"新增"的ID
SendMessage h1, WM_COMMAND, id, ByVal 0&
End Sub
