using System;
using System.Runtime.InteropServices;
using System.Threading;

namespace Debug;
public class zidonghua
{
    [StructLayout(LayoutKind.Sequential)]
    struct INPUT
    {
        public int type;
        public InputUnion u;
    }

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

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

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

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

    const int INPUT_MOUSE = 0;
    const int INPUT_KEYBOARD = 1;
    const int KEYEVENTF_KEYUP = 0x0002;
    const int MOUSEEVENTF_LEFTDOWN = 0x0002;
    const int MOUSEEVENTF_LEFTUP = 0x0004;

    static void SimulateKeyPress(short keyCode)
    {
        INPUT[] inputs = new INPUT[2];
        inputs[0].type = INPUT_KEYBOARD;
        inputs[0].u.ki.wVk = keyCode;
        inputs[0].u.ki.dwFlags = 0;

        inputs[1].type = INPUT_KEYBOARD;
        inputs[1].u.ki.wVk = keyCode;
        inputs[1].u.ki.dwFlags = KEYEVENTF_KEYUP;

        SendInput((uint)inputs.Length, inputs, Marshal.SizeOf(typeof(INPUT)));
    }

    static void SimulateMouseClick(int x, int y)
    {
        INPUT[] inputs = new INPUT[2];
        inputs[0].type = INPUT_MOUSE;
        inputs[0].u.mi.dx = x;
        inputs[0].u.mi.dy = y;
        inputs[0].u.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;

        inputs[1].type = INPUT_MOUSE;
        inputs[1].u.mi.dx = x;
        inputs[1].u.mi.dy = y;
        inputs[1].u.mi.dwFlags = MOUSEEVENTF_LEFTUP;

        SendInput((uint)inputs.Length, inputs, Marshal.SizeOf(typeof(INPUT)));
    }
    [DllImport("user32.dll")]
    static extern short VkKeyScan(char ch);
    public zidonghua()
    {
        Thread.Sleep(3000);
        SimulateKeyPress(VkKeyScan('A'));
        Thread.Sleep(1000);
        SimulateMouseClick(500, 500);
    }
}