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Option Explicit
Private Declare Function ShowWindow Lib "user32.dll" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Private Const SW_MAXIMIZE As Long = 3
Private Sub Form_Load()
ShowWindow lHwnd,SW_MAXIMIZE'lHwnd是已知一个窗体的句柄
End Sub
Option Explicit
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 FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Const WM_SYSCOMMAND = &H112
Public Const SC_MAXIMIZE = &HF030&
Option Explicit
Private Sub Command1_Click()
Dim hwnd As Long
hwnd = FindWindow("Notepad", vbNullString)
SendMessage hwnd, WM_SYSCOMMAND, SC_MAXIMIZE, ByVal 0&
End Sub