为了进行测试,我将屏幕保护程序设置为 1 分钟并需要密码。
我尝试捕获 SC_SCREENSAVE 并在 VB .Net 中返回 -1。正如评论的那样,它在没有屏幕保护程序密码的情况下有效,但是fails如果屏幕保护程序密码处于活动状态。 (我在Windows XP 中尝试过)。我还将其放入计时器的滴答事件中,每 1000 毫秒一次:
Static dir As Integer = 4
Cursor.Position = Cursor.Position + New Size(dir, dir)
dir = -dir
这不起作用。光标来回晃动,1 分钟后屏幕保护程序会短暂闪烁,然后关闭。屏幕保护程序只打开一会儿,不足以要求输入密码。但闪光灯还是很难看。
Then我尝试使用user32.dll的SetCursorPos和GetCursorPos。您可以在 pinvoke 上查找它们。与上面的结果相同。
Then我查看了这个问题其他地方提到的“JiggleMouse”的代码。 JiggleMouse 使用 SendInput。发送输入有效!屏幕保护程序没有闪烁。我在计时器内调用了 SendInput,每 50 秒触发一次(略小于屏幕保护程序的最小超时时间 60 秒)。将鼠标移动 0,0 增量就足够了,没有真正的移动。那does工作。放入 Tick 事件的代码:
Dim i(0) As INPUT
i(0).dwType = INPUT.InputType.INPUT_MOUSE
i(0).mkhi = New MOUSEKEYBDHARDWAREINPUT
i(0).mkhi.mi = New MOUSEINPUT
i(0).mkhi.mi.dx = 0
i(0).mkhi.mi.dy = 0
i(0).mkhi.mi.mouseData = 0
i(0).mkhi.mi.dwFlags = MOUSEINPUT.MouseEventFlags.MOUSEEVENTF_MOVE
i(0).mkhi.mi.time = 0
i(0).mkhi.mi.dwExtraInfo = IntPtr.Zero
SendInput(1, i(0), Marshal.SizeOf(i(0)))
这来自 pinvoke.com:
Public Declare Function SendInput Lib "user32" (ByVal nInputs As Integer, ByRef pInputs As INPUT, ByVal cbSize As Integer) As Integer
Public Structure INPUT
Enum InputType As Integer
INPUT_MOUSE = 0
INPUT_KEYBOARD = 1
INPUT_HARDWARE = 2
End Enum
Dim dwType As InputType
Dim mkhi As MOUSEKEYBDHARDWAREINPUT
End Structure
Public Structure MOUSEINPUT
Enum MouseEventFlags As Integer
MOUSEEVENTF_MOVE = &H1
MOUSEEVENTF_LEFTDOWN = &H2
MOUSEEVENTF_LEFTUP = &H4
MOUSEEVENTF_RIGHTDOWN = &H8
MOUSEEVENTF_RIGHTUP = &H10
MOUSEEVENTF_MIDDLEDOWN = &H20
MOUSEEVENTF_MIDDLEUP = &H40
MOUSEEVENTF_XDOWN = &H80
MOUSEEVENTF_XUP = &H100
MOUSEEVENTF_WHEEL = &H800
MOUSEEVENTF_VIRTUALDESK = &H4000
MOUSEEVENTF_ABSOLUTE = &H8000
End Enum
Dim dx As Integer
Dim dy As Integer
Dim mouseData As Integer
Dim dwFlags As MouseEventFlags
Dim time As Integer
Dim dwExtraInfo As IntPtr
End Structure
Public Structure KEYBDINPUT
Public wVk As Short
Public wScan As Short
Public dwFlags As Integer
Public time As Integer
Public dwExtraInfo As IntPtr
End Structure
Public Structure HARDWAREINPUT
Public uMsg As Integer
Public wParamL As Short
Public wParamH As Short
End Structure
Const KEYEVENTF_EXTENDEDKEY As UInt32 = &H1
Const KEYEVENTF_KEYUP As UInt32 = &H2
Const KEYEVENTF_UNICODE As UInt32 = &H4
Const KEYEVENTF_SCANCODE As UInt32 = &H8
Const XBUTTON1 As UInt32 = &H1
Const XBUTTON2 As UInt32 = &H2
<StructLayout(LayoutKind.Explicit)> Public Structure MOUSEKEYBDHARDWAREINPUT
<FieldOffset(0)> Public mi As MOUSEINPUT
<FieldOffset(0)> Public ki As KEYBDINPUT
<FieldOffset(0)> Public hi As HARDWAREINPUT
End Structure