VB.NET使用sendinput向其他软件发送回车

以下是VB.NET中使用SendInput函数向其他软件发送回车的示例代码：

Private Const INPUT_KEYBOARD As Integer = 1
Private Const KEYEVENTF_KEYUP As Integer = &H2
Private Const VK_RETURN As Integer = &HD

Private Structure KEYBDINPUT
    Public wVk As Short
    Public wScan As Short
    Public dwFlags As Integer
    Public time As Integer
    Public dwExtraInfo As IntPtr
End Structure

Private Structure INPUT
    Public type As Integer
    Public ki As KEYBDINPUT
End Structure

Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Declare Function SetForegroundWindow Lib "user32.dll" (ByVal hWnd As IntPtr) As Long
Private Declare Function SendInput Lib "user32.dll" (ByVal nInputs As Integer, ByVal pInputs() As INPUT, ByVal cbSize As Integer) As Integer

Private Sub SendEnterToWindow(ByVal windowName As String)
    Dim hWnd As IntPtr = FindWindow(Nothing, windowName)
    If hWnd <> 0 Then
        SetForegroundWindow(hWnd)

        Dim input(1) As INPUT
        input(0).type = INPUT_KEYBOARD
        input(0).ki.wVk = VK_RETURN

        input(1).type = INPUT_KEYBOARD
        input(1).ki.wVk = VK_RETURN
        input(1).ki.dwFlags = KEYEVENTF_KEYUP

        SendInput(2, input, Len(input(0)))
    End If
End Sub

在这个示例中，使用FindWindow函数查找指定窗口的句柄，然后使用SetForegroundWindow函数将指定窗口设置为前台窗口，以保证SendInput函数发送的输入事件被正确接收。然后构造输入事件序列，通过调用SendInput函数向指定窗口发送回车键事件。

SendEnterToWindow函数接受一个窗口名称作为参数，可以根据需要修改为其他方式指定窗口句柄。

建议在使用SendInput函数时，尽量保证输入事件的顺序和正确性，以避免出现不必要的问题。同时，SendInput函数需要管理员权限才能正常工作，因此需要使用管理员权限运行程序。