模拟键盘的动作信号-"SendInput示例"

(1)定义一个引用类（核心类）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Runtime.InteropServices;

namespace VirtualKey
{
    class DLL_Navigation
    {
        public const int WM_KEYDOWN = 0x0100;
        public const int WM_KEYUP = 0x0101;
        public const int WM_CHAR = 0x0106;
        public const int WM_SYSKEYDOWN = 0x0104;
        public const int WM_SYSKEYUP = 0x0105;

        public const int VK_MENU = 0x12;    //ALT   键
        public const int VK_LMENU = 0xA4;    //LALT   键
        public const int Key_T = 0x54;      //T     键
        public const int Key_Q = 0x51;      //Q     键
        public const int Key_C = 0x43;      //C     键
        public const int Key_F = 0x46;      //F     键
        public const int Key_P = 0x50;      //P     键
        public const int VK_LWIN = 0x5B;    //VK_LWIN   键
        public const int Key_D = 0x44;      //D     键
         public const int Key_E = 0x45;      //E     键

        [DllImport("user32.dll")]
        public static extern IntPtr FindWindowA(string lpClassName, string lpWindowName);

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);

        [DllImport("user32.dll")]
        public static extern bool SendMessageA(IntPtr hwnd, uint msg, int wParam, uint lParam);

        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow(); //获得本窗体的句柄
        [DllImport("user32.dll")]
        public static extern bool SetForegroundWindow(IntPtr hWnd); //设置此窗体为活动窗体

        [DllImport("user32.dll")]
        public static extern uint SendInput(uint cInputs, Input[] inputs, int size);

        public enum INPUT_TYPE { INPUT_MOUSE = 0, INPUT_KEYBOARD, INPUT_HARDWARE }
        public enum KEYEVENTF { KEYEVENTF_EXTENDEDKEY = 0x0001, KEYEVENTF_KEYUP = 0x0002, KEYEVENTF_SCANCODE = 0x0008, KEYEVENTF_UNICODE = 0x0004 };

        [StructLayout(LayoutKind.Explicit)]
        public struct Input
        {
            //x64 - 8, x32 - 4
            [FieldOffset(0)] public INPUT_TYPE type;
            [FieldOffset(4)] public MouseInput mi;
            [FieldOffset(4)] public tagKEYBDINPUT ki;
            [FieldOffset(4)] public tagHARDWAREINPUT hi;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct MouseInput
        {
            public Int32 dx;
            public Int32 dy;
            public Int32 Mousedata;
            public Int32 dwFlag;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct tagKEYBDINPUT
        {
            public Int16 wVk;
            public Int16 wScan;
            public Int32 dwFlags;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct tagHARDWAREINPUT
        {
            public Int32 uMsg;
            public Int16 wParamL;
            public Int16 wParamH;
        }
    }
}

（2）应用类

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using System.Diagnostics;
using System.Runtime.InteropServices;

namespace VirtualKey
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        //UI 添加一个按钮，名称为：btn_Send
        private void btn_Send_Click(object sender, EventArgs e)
        {
            SendMsg();
        }

        //SendInput示例：
        //1.找到目标窗体句柄Obj
        //2.令目标窗体处于前置状态
        //3.构建待发送的模拟键盘信号：ALT+T+Q
        //4.执行发送动作
        private void SendMsg()
        {
            //IntPtr hWnd = DLL_Navigation.FindWindowA("TMainForm", "TS");//通过"Microsoft Spy++"确定参数1的值。参数1可以为空。
            IntPtr hWnd = DLL_Navigation.FindWindowA(null, "TS");
            if (hWnd == null)
            {
                Console.WriteLine("未找到指定程序窗体！");
                return;
            }

            //DLL_Navigation.ShowWindow(hWnd, 1); //如果无需显示窗体，可以省略此语句。
            if(hWnd!=DLL_Navigation.GetForegroundWindow())
            {
                DLL_Navigation.SetForegroundWindow(hWnd);
            }

            DLL_Navigation.Input[] inputs=new DLL_Navigation.Input[6];
            inputs[0].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[0].ki.wVk = DLL_Navigation.VK_LMENU;
        
            inputs[1].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[1].ki.wVk = DLL_Navigation.Key_T;

            inputs[2].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[2].ki.wVk = DLL_Navigation.Key_T;
            inputs[2].ki.dwFlags = (int)DLL_Navigation.KEYEVENTF.KEYEVENTF_KEYUP;

            inputs[3].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[3].ki.wVk = DLL_Navigation.Key_Q;

            inputs[4].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[4].ki.wVk = DLL_Navigation.Key_Q;
            inputs[4].ki.dwFlags = (int)DLL_Navigation.KEYEVENTF.KEYEVENTF_KEYUP;

            inputs[5].type = DLL_Navigation.INPUT_TYPE.INPUT_KEYBOARD;
            inputs[5].ki.wVk = DLL_Navigation.VK_LMENU;
            inputs[5].ki.dwFlags = (int)DLL_Navigation.KEYEVENTF.KEYEVENTF_KEYUP;

            uint uSent = DLL_Navigation.SendInput((uint)inputs.Length, inputs, Marshal.SizeOf(inputs[0]));
74　　　　　　　　if(uSent!=(uint)inputs.Length)
　　　　　　　　　{Console.WriteLine("按键命令发送失败！");}
                inputs = null;

        }
    }
}