SendInput不执行点击鼠标按钮，除非我移动光标

本文关键字：非我 移动 光标 按钮 鼠标 执行 SendInput | 更新日期: 2023-09-27 18:13:32

SendInput不执行点击鼠标按钮，除非我移动光标。

如果你能帮助我，我将不胜感激，因为我似乎无法理解它。

我有一个程序，执行鼠标单击前景窗口，其中我使用SendInput来模拟鼠标左键单击。问题是，如果我移动光标到点击位置比SendInput将使点击，然而，如果我不移动光标比没有点击发生，即使我传递x和y点到MouseInputData。我想执行鼠标左键单击，而不需要实际移动光标。

下面是我的类(它相当简单和直接)

namespace StackSolution.Classes
{
    public static class SendInputClass
    {
        [DllImport("user32.dll", SetLastError = true)]
        static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);
        [DllImport("user32.dll")]
        static extern bool SetCursorPos(int X, int Y);
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool GetCursorPos(out Point lpPoint);

        [StructLayout(LayoutKind.Sequential)]
        struct INPUT
        {
            public SendInputEventType type;
            public MouseKeybdhardwareInputUnion mkhi;
        }
        [StructLayout(LayoutKind.Explicit)]
        struct MouseKeybdhardwareInputUnion
        {
            [FieldOffset(0)]
            public MouseInputData mi;
            [FieldOffset(0)]
            public KEYBDINPUT ki;
            [FieldOffset(0)]
            public HARDWAREINPUT hi;
        }
        [StructLayout(LayoutKind.Sequential)]
        struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
        [StructLayout(LayoutKind.Sequential)]
        struct HARDWAREINPUT
        {         
            public int uMsg;
            public short wParamL;
            public short wParamH;
        }
        struct MouseInputData
        {
            public int dx;
            public int dy;
            public uint mouseData;
            public MouseEventFlags dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }
        [Flags]
        enum MouseEventFlags : uint
        {
            MOUSEEVENTF_MOVE = 0x0001,
            MOUSEEVENTF_LEFTDOWN = 0x0002,
            MOUSEEVENTF_LEFTUP = 0x0004,
            MOUSEEVENTF_RIGHTDOWN = 0x0008,
            MOUSEEVENTF_RIGHTUP = 0x0010,
            MOUSEEVENTF_MIDDLEDOWN = 0x0020,
            MOUSEEVENTF_MIDDLEUP = 0x0040,
            MOUSEEVENTF_XDOWN = 0x0080,
            MOUSEEVENTF_XUP = 0x0100,
            MOUSEEVENTF_WHEEL = 0x0800,
            MOUSEEVENTF_VIRTUALDESK = 0x4000,
            MOUSEEVENTF_ABSOLUTE = 0x8000
        }
        enum SendInputEventType : int
        {
            InputMouse,
            InputKeyboard,
            InputHardware
        }
        public static void ClickLeftMouseButton(int x, int y)
        {
            INPUT mouseInput = new INPUT();
            mouseInput.type = SendInputEventType.InputMouse;
            mouseInput.mkhi.mi.dx = x;
            mouseInput.mkhi.mi.dy = y;
            mouseInput.mkhi.mi.mouseData = 0;
            //getting current cursor location
            Point p;
            if (GetCursorPos(out p))
                SetCursorPos(x, y);

            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
            //returning cursor to previous position
            SetCursorPos(p.X, p.Y);
        }    
    }
  }

相同的ClickLeftMouseButton函数将不会点击，如果我删除获取光标位置。

   public static void ClickLeftMouseButton(int x, int y)
        {
            INPUT mouseInput = new INPUT();
            mouseInput.type = SendInputEventType.InputMouse;
            mouseInput.mkhi.mi.dx = x;
            mouseInput.mkhi.mi.dy = y;
            mouseInput.mkhi.mi.mouseData = 0;                     

            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
            mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
            SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));            
        }

提前感谢。

SendInput不执行点击鼠标按钮，除非我移动光标

在使用SendInput函数时，您应该考虑以下几点:

如果不指定MOUSEEVENTF_ABSOLUTE标志，则dx和dy (MouseInputData结构)是相对于当前鼠标位置的坐标。如果指定MOUSEEVENTF_ABSOLUTE，则dx和dy是0到65535之间的绝对坐标。所以，如果你的x和y坐标是屏幕坐标，你应该使用以下函数来计算dx和dy:

enum SystemMetric
{
  SM_CXSCREEN = 0,
  SM_CYSCREEN = 1,
}
[DllImport("user32.dll")]
static extern int GetSystemMetrics(SystemMetric smIndex);
int CalculateAbsoluteCoordinateX(int x)
{
  return (x * 65536) / GetSystemMetrics(SystemMetric.SM_CXSCREEN);
}
int CalculateAbsoluteCoordinateY(int y)
{
  return (y * 65536) / GetSystemMetrics(SystemMetric.SM_CYSCREEN);
}

此外，在你通过SendInput发送MOUSEDOWN和MOUSEUP事件之前，你必须将鼠标移动到你想要点击的控件上:

public static void ClickLeftMouseButton(int x, int y)
{
  INPUT mouseInput = new INPUT();
  mouseInput.type = SendInputEventType.InputMouse;
  mouseInput.mkhi.mi.dx = CalculateAbsoluteCoordinateX(x);
  mouseInput.mkhi.mi.dy = CalculateAbsoluteCoordinateY(y);
  mouseInput.mkhi.mi.mouseData = 0;                     

  mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_MOVE |MouseEventFlags.MOUSEEVENTF_ABSOLUTE;
  SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
  mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
  SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));
  mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
  SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));            
}

上面的代码假设x和y是屏幕像素坐标。您可以使用以下代码计算winform上按钮(目标)的坐标:

 Point screenCoordsCentre=
button1.PointToScreen(new Point(button1.Width/2, button1.Height/2));

希望有帮助。

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