10

下面是我用来通过 SendInput API 模拟按键的一些代码的摘录。如果我将应用程序设置为针对 x86 CPU 进行编译，这可以正常工作，但不适用于 x64 CPU 编译。

我猜这与 x64 使用双倍大小指针这一事实有关，但我试图将其更改为此[FieldOffset(4)]但[FieldOffset(8)]没有奏效。

这可能与它正在导入 32 位版本的 user32.dll 的事实有关吗？

    #region SendInput API

    [DllImport("user32.dll", EntryPoint = "SendInput", SetLastError = true)]
    static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

    [DllImport("user32.dll", EntryPoint = "GetMessageExtraInfo", SetLastError = true)]
    static extern IntPtr GetMessageExtraInfo();

    private enum KeyEvent
    {
        KeyUp = 0x0002,
        KeyDown = 0x0000,
        ExtendedKey = 0x0001
    }

    private struct KEYBDINPUT
    {
        public ushort wVk;
        public ushort wScan;
        public uint dwFlags;
        public long time;
        public uint dwExtraInfo;
    };

    [StructLayout(LayoutKind.Explicit, Size = 28)]
    private struct INPUT
    {
        [FieldOffset(0)]
        public uint type;
        [FieldOffset(4)]
        public KEYBDINPUT ki;
    };

    #endregion

    public void sendKey(KeyCode Key)
    {
        INPUT[] InputList = new INPUT[2];

        INPUT keyInput = new INPUT();
        keyInput.type = 1;

        keyInput.ki.wScan = 0;
        keyInput.ki.time = 0;
        keyInput.ki.dwFlags = (int)KeyEvent.KeyDown;
        keyInput.ki.dwExtraInfo = (uint)GetMessageExtraInfo();
        keyInput.ki.wVk = (ushort)Key;

        InputList[0] = keyInput;

        keyInput.ki.dwFlags = (int)KeyEvent.KeyUp;

        InputList[1] = keyInput;

        SendInput((uint)2, InputList, Marshal.SizeOf(InputList[0]));
    }
4

3 回答 3

12

除了 SLaks 发现的错误之外，您剩下的问题是大小INPUT不正确。这意味着SendInput失败，因为它接收到一个类型的参数INPUT[]。您无法指定大小，StructLayout(LayoutKind.Explicit, Size = 28)因为您需要同时处理 x86 和 x64 的代码。

这一切都源于您仅将KEYBRDINPUT结构包含在INPUT. MOUSEINPUT结构大于KEYBRDINPUT导致问题的原因。

最好的解决方案是正确定义 INPUT 结构，包括联合部分。这样做（来自pinvoke.net的声明）。

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

[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;
}

[StructLayout(LayoutKind.Explicit)]
struct MouseKeybdHardwareInputUnion
{
    [FieldOffset(0)]
    public MOUSEINPUT mi;

    [FieldOffset(0)]
    public KEYBDINPUT ki;

    [FieldOffset(0)]
    public HARDWAREINPUT hi;
}

[StructLayout(LayoutKind.Sequential)]
struct INPUT
{
    public uint type;
    public MouseKeybdHardwareInputUnion mkhi;
}
于 2011-07-26T16:23:42.893 回答
5

dwExtraInfo是一个指针。
因此，在 32 位代码中需要 4 个字节宽，在 64 位代码中需要 8 个字节。

要在 C# 中执行此操作，请使用IntPtr(not uint，始终为 4 个字节)

于 2011-07-26T13:27:02.073 回答
0

对于 64 位平台，唯一需要更改的是FieldOffset(8)(而不是 4)INPUT的第二个参数。无需更改或指定其余结构的大小。 这已经足够且完整（注意我使用默认InputUnion结构而不是KEYBDINPUTwhile 没有区别）：

 [StructLayout(LayoutKind.Explicit)]
    public struct INPUT
    {
    [FieldOffset(0)] public uint Type;
    [FieldOffset(8)] public InputUnion U;
    }

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


    [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 UInt16 Vk;
    public UInt16 Scan;
    public UInt32 Flags;
    public UInt32 Time;
    public IntPtr ExtraInfo;
}

    [StructLayout(LayoutKind.Sequential)]
    public struct HARDWAREINPUT
    {
        public uint uMsg;
        public ushort wParamL;
        public ushort wParamH;
    }
于 2021-12-16T23:47:40.500 回答