vb.net打开软件并使用MainWindowHandle点击登录按钮

您可以使用以下代码来打开软件并使用MainWindowHandle点击登录按钮：

' 打开软件
Process.Start("your software path")

' 获取软件主窗口句柄
Dim handleMainWindow As IntPtr = IntPtr.Zero
Do While handleMainWindow = IntPtr.Zero
    handleMainWindow = FindWindow(Nothing, "your software title")
    Thread.Sleep(1000)
Loop

' 获取登录按钮句柄
Dim handleLoginButton As IntPtr = FindWindowEx(handleMainWindow, IntPtr.Zero, "Button", "Login")

' 点击登录按钮
SendMessage(handleLoginButton, BM_CLICK, IntPtr.Zero, IntPtr.Zero)

需要注意的是，您需要在代码中替换"your software path"和"your software title"为您自己的软件路径和标题。此外，您还需要在代码中导入以下三个Win32 API函数：

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWndParent As IntPtr, ByVal hWndChildAfter As IntPtr, ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

这些函数用于获取窗口句柄和向窗口发送消息。