vb隐藏右下角图标(FindwindowEx) & 向已知句柄的窗口发送按键消息

.定义一个模块, 内容为:
Option Explicit

Public Declare Function GetNextWindow Lib "user32" Alias "GetWindow" (ByVal hwnd As Long, ByVal wFlag As Long) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long

Public Declare Function FindWindowa Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Public Declare Function GetForegroundWindow Lib "user32" () As Long

2. 给窗口加一个按钮, 在按钮的click事件里写以下内容:
Option Explicit

Private Sub Command1_Click()

Dim hwnd As Long
hwnd = GetForegroundWindow ' FindWindowa("Notepad", "新建 文本文档.txt - 记事本")

Dim str1 As String, len1 As Long
str1 = Space(255) '定义接收字串.
GetWindowText hwnd, str1, 1024

Do While