SendInput 无法在 C# 中正确模拟键盘

Question

我正在尝试使用 C# 中的

SendInput()

来模拟鼠标和键盘事件。鼠标模拟完美，键盘模拟不行。

在这种情况下，我尝试使用另一种语言来挂钩键盘以确定它是否真的有效，但我无法挂钩任何东西。我尝试查看是否有错误，但是

Marshal.GetLastWin32Error()

返回

0

，这意味着没有错误。我也尝试以管理员身份运行，但没有成功。

之后，我在StackOverflow上发现了类似的情况，我尝试将代码改为

KeyEventFlags.KEYDOWN | KeyEventFlags.SCANCODE

和

KeyEventFlags.KEYDOWN | KeyEventFlags.UNICODE

，但都不起作用。

这是代码：

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

KEYBDINPUT keyboardInput = new KEYBDINPUT();
keyboardInput.dwFlags = (uint)(KeyEventFlags.KEYDOWN);
keyboardInput.wVk = (ushort)'A';
    
InputUnion union = new InputUnion();
union.ki = keyboardInput;

INPUT[] input = new INPUT[1];
input[0].type = (uint)InputTypes.KEYBOARD;
input[0].U = union;
Console.WriteLine(SendInput(1, input, Marshal.SizeOf(union)));
Console.WriteLine(Marshal.GetLastWin32Error());

这是定义枚举的代码：

public enum InputTypes : uint
{
    MOUSE = 0,
    KEYBOARD = 1,
    HARDWARE = 2
}

public enum MouseEventFlags : uint
{
    ABSOLUTE = 0x8000,
    LEFTDOWN = 0x0002,
    LEFTUP = 0x0004,
    MIDDLEDOWN = 0x0020,
    MIDDLEUP = 0x0040,
    MOVE = 0x0001,
    RIGHTDOWN = 0x0008,
    RIGHTUP = 0x0010,
    WHEEL = 0x0800,
    XDOWN = 0x0080,
    XUP = 0x0100,
    HWHEEL = 0x01000
}

public enum KeyEventFlags : ushort
{
    KEYDOWN = 0x0000,
    EXTENDEDKEY = 0x0001,
    KEYUP = 0x0002,
    UNICODE = 0x0004,
    SCANCODE = 0x0008
}

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

[StructLayout(LayoutKind.Sequential)]
public struct HARDWAREINPUT
{
    public uint uMsg;
    public ushort wParamL;
    public ushort wParamH;
}

我想知道为什么这不起作用，以及我错在哪一步。

Answer 1

我过去曾为此使用过 SendKeys。 占用com端口的条码扫描仪可以将扫描数据发送到具有焦点的窗口。

foreach (char c in line + "\r\n")
{
    System.Windows.Forms.SendKeys.SendWait("" + c);
}

更多信息在这里

https://referencesource.microsoft.com/#System.Windows.Forms/winforms/Managed/System/WinForms/SendKeys.cs,c16b3cbcd61cbe78