C# SendInput() 在控制台应用程序中总是 returns 0

Question

我开发了一个简单的控制台应用程序来使用 xinput 轮询 Xbox 控制器。我想使用从其中一根拇指杆获得的值来移动鼠标。我能够从拇指杆获取 x 和 y 值，但是当我将这些值用于 SendInput()（使用 User32.dll）时，鼠标不会移动并且 return 值为 0。

根据Microsoft、"If the function returns zero, the input was already blocked by another thread."

如何找到阻塞它的其他线程？它只是一个简单的控制台应用程序 (exe)，由 Visual Studio 启动，将 x 和 y 值打印到屏幕并尝试移动鼠标。

long x = controller.x;  // values from the controller
long y = controller.y;  // these are checked and do contain numbers

INPUT mouseMoveInput =  new INPUT();
mouseMoveInput.type = 0; // mouse
mouseMoveInput.mi.dx = x;
mouseMoveInput.mi.dy = y;
mouseMoveInput.mi.mouseData = 0;
mouseMoveInput.mi.dwFlags = MOUSEEVENTF_MOVE;

var result = SendInput(1, ref mouseMoveInput, Marshal.SizeOf(new INPUT());
// result always returns 0

我错过了什么吗？这应该有效吗？

声明如下：

    [StructLayout(LayoutKind.Explicit)]
    public struct MOUSEINPUT
    {
        [FieldOffset(0)]
        public long X;

        [FieldOffset(8)]
        public long Y;

        [FieldOffset(16)]
        public uint MouseData;

        [FieldOffset(20)]
        public uint Flags;

        [FieldOffset(24)]
        public uint Time;

        [FieldOffset(28)]
        public IntPtr ExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct KEYBOARDINPUT
    {
        public ushort Vk;
        public ushort Scan;
        public uint Flags;
        public uint Time;
        public IntPtr ExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct HARDWAREINPUT
    {
        public uint Msg;
        public ushort ParamL;
        public ushort ParamH;
    }


    [StructLayout(LayoutKind.Explicit)]
    public struct INPUT
    {
        [FieldOffset(0)]
        public uint type;

        [FieldOffset(4)]
        public MOUSEINPUT mi;

        [FieldOffset(4)]
        public KEYBOARDINPUT ki;

        [FieldOffset(4)]
        public HARDWAREINPUT hi;
    }

更新：使用 mouse-event 确实有效，但此功能已弃用。既然能用了，用起来有问题吗？

结构大小有些奇怪：

标签输入的大小：40
mouseMoveInput 的大小：40
MOUSEINPUT 的大小：32
uint 的大小：4

但是如果 tagINPUT 由 MOUSEINPUT 和 uint 组成，那么它的大小不应该是 36 吗？

Answer 1

SendInput 的第二个参数应该是指向数组的指针，而不是 ref 参数，尤其不是直接指向结构的 ref。

我也会只对实际需要它的结构使用显式布局，让其余部分按顺序排列。更简单。

这段代码对我有用：

const int INPUT_MOUSE = 0;
const int MOUSEEVENTF_MOVE = 0x0001;

[DllImport("user32.dll", SetLastError = true)]
private static extern uint SendInput(uint numberOfInputs, [MarshalAs(UnmanagedType.LPArray)] INPUT[] inputs, int sizeOfInputStructure);

void Main()
{
    INPUT mouseMoveInput = new INPUT();
    mouseMoveInput.type = INPUT_MOUSE;
    mouseMoveInput.mi.dx = 10;
    mouseMoveInput.mi.dy = 10;
    mouseMoveInput.mi.mouseData = 0;
    mouseMoveInput.mi.dwFlags = MOUSEEVENTF_MOVE;

    var result = SendInput(1, new INPUT[] { mouseMoveInput}, Marshal.SizeOf(mouseMoveInput));
    if(result == 0) {
        throw new Win32Exception();
    }
}

[StructLayout(LayoutKind.Sequential)]
public struct MOUSEINPUT
{
    public int dx;
    public int dy;
    public uint mouseData;
    public uint dwFlags;
    public uint time;
    public IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
public struct KEYBDINPUT
{
    public ushort wVk;
    public ushort wScan;
    public uint dwFlags;
    public uint time;
    public IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
public struct HARDWAREINPUT
{
    public uint Msg;
    public ushort ParamL;
    public ushort ParamH;
}


[StructLayout(LayoutKind.Explicit)]
public struct INPUT
{
    [FieldOffset(0)]
    public uint type;
    [FieldOffset(4)]
    public MOUSEINPUT mi;
    [FieldOffset(4)]
    public KEYBDINPUT ki;
    [FieldOffset(4)]
    public HARDWAREINPUT hi;
}

C# SendInput() 在控制台应用程序中总是 returns 0

C# SendInput() always returns 0 in Console Application

c#

console-application

xinput