界面最小化时热键不起作用答案

【问题标题】：Hotkey doesn't work while interface is minimized界面最小化时热键不起作用
【发布时间】：2021-01-30 17:59:25
【问题描述】：

我使用计时器和几个按钮在 Visual Basic 中创建了一个简单的自动点击器。

我为我的开始和停止按钮分配了键绑定，但它们仅在界面打开时才起作用，并且我想在程序最小化时使用它们。

我该怎么做呢？下面是一些更重要的上下文代码。如果您需要更多信息，请告诉我。

Declare Sub mouse_event Lib "user32.dll" Alias "mouse_event" (ByVal dwFlags As Int32, ByVal dx As Int32, ByVal cButtons As Int32, ByVal dwExtraInfo As Int32, v As Integer)

Private Sub frmAutoClicker_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
        If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Z) Then
            btnStart.PerformClick()
        End If
  End Sub
 Private Sub btnStart_Click(sender As Object, e As EventArgs) Handles btnStart.Click

        Timer1.Start()

    End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        mouse_event(&H2, 0, 0, 0, 1)
        mouse_event(&H4, 0, 0, 0, 1)
End Sub

【问题讨论】：

标签： vb.net visual-studio background-process hotkeys

【解决方案1】：

你可以从 user32.dll 中尝试 SetWindowsHookEx，这是一种激进的方法......但它会起作用......（在这个论坛中搜索 SetWindowsHookEx......）

或者您可以尝试向应用程序添加消息过滤器：

Application.AddMessageFilter

【讨论】：

谢谢。我会试试看它是否有效

【解决方案2】：

您可以使用RegisterHotkey 来实现 VB.NET 在最小化时检测按键。
了解Virtual-Key Codes是第一步。

为了方便测试，我设置了Timer1_Tick的自动点击次数限制，限制为50次。

示例代码：

Imports System.Runtime.InteropServices

Public Class frmAutoClicker
Public Const WM_HOTKEY As Integer = &H312

Public Const VK_1 As Integer = &H5A   '0x5A  Z key
Dim i As Integer = 0

<DllImport("User32.dll")>
Public Shared Function RegisterHotKey(ByVal hwnd As IntPtr,
                    ByVal id As Integer, ByVal fsModifiers As Integer,
                    ByVal vk As Integer) As Integer
End Function

<DllImport("User32.dll")>
Public Shared Function UnregisterHotKey(ByVal hwnd As IntPtr,
                    ByVal id As Integer) As Integer
End Function

Declare Sub mouse_event Lib "user32.dll" Alias "mouse_event" (ByVal dwFlags As Int32, ByVal dx As Int32, ByVal cButtons As Int32, ByVal dwExtraInfo As Int32, v As Integer)

Private Sub frmAutoClicker_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim retVal1 As Boolean = RegisterHotKey(Me.Handle, 10, 0, VK_1)
    If retVal1 = False Then
        MsgBox("The hotkeys could not be registered!", MsgBoxStyle.Critical)
        Application.Exit()
    End If
End Sub

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    If m.Msg = WM_HOTKEY Then
        Dim id As IntPtr = m.WParam
        Select Case (id.ToString)
            Case "10"
                btnStart.PerformClick()
       End Select
    End If
    MyBase.WndProc(m)
End Sub

Private Sub frmAutoClicker_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
    UnregisterHotKey(Me.Handle, 10)
End Sub
Private Sub btnStart_Click(sender As Object, e As EventArgs) Handles btnStart.Click
    Timer1.Start()
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
    If i > 50 Then
        Timer1.Stop()
        i = 0
    Else
        mouse_event(&H2, 0, 0, 0, 1)
        mouse_event(&H4, 0, 0, 0, 1)
    End If
    i = i + 1
End Sub

End Class

结果：

【讨论】：