Private Const WM_KEYDOWN = &H100
Private Const VK_RETURN = &HD
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
如:SendMessage Command4.hwnd, WM_KEYDOWN, VK_RETURN, 1