张赐荣: C# 调用 SendInput 模拟输入中文

封装了一个C#模拟输入字符串的类。
调用 Keyboard.InputText 方法,能实现在光标所在处输入文字,就好像输入法一样。

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

namespace CRApp
{
   public static class KeyboardInput
   {
       [DllImport("user32.dll")]
       static extern uint SendInput(uint nInputs, [MarshalAs(UnmanagedType.LPArray), In] INPUT[] pInputs, int cbSize);

       [StructLayout(LayoutKind.Sequential)]
       struct INPUT
       {
           public uint type;
           public MOUSEKEYBDHARDWAREINPUT mkhi;
       }

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

       [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 uint uMsg;
           public ushort wParamL;
           public ushort wParamH;
       }

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

       public static int InputText(string text)
       {
           if (string.IsNullOrEmpty(text))
           {
               return 0;
           }
           INPUT[] inputs = new INPUT[text.Length * 2];
           for (int i = 0, j = 0; i < text.Length; i++, j += 2)
           {
               ushort ch = text[i];
               inputs[j] = new INPUT
               {
                   type = 1,
                   mkhi = new MOUSEKEYBDHARDWAREINPUT
                   {
                       ki = new KEYBDINPUT
                       {
                           wVk = 0,
                           wScan = ch,
                           dwFlags = 0x0004,
                           time = 0,
                           dwExtraInfo = IntPtr.Zero
                       }
                   }
               };
               inputs[j + 1] = new INPUT
               {
                   type = 1,
                   mkhi = new MOUSEKEYBDHARDWAREINPUT
                   {
                       ki = new KEYBDINPUT
                       {
                           wVk = 0,
                           wScan = ch,
                           dwFlags = 0x0004 | 0x0002,
                           time = 0,
                           dwExtraInfo = IntPtr.Zero
                       }
                   }
               };
           }
           uint result = SendInput((uint)inputs.Length, inputs, Marshal.SizeOf(typeof(INPUT)));
           return result > 0 ? text.Length : 0;
       }
   }
}

此代码是使用 Windows API 键盘输入模拟的 C# 实现。该代码将键盘输入事件发送到操作系统以模拟文本字符串的键入。这是通过从 user32.dll 库中导入 SendInput 函数来完成的，该函数接受一个 INPUT 结构数组。 `INPUT_KEYBOARD` 类型用于指定输入事件是针对键盘的。 `KEYBDINPUT` 结构然后用于指定特定的键盘事件，包括被按下的键的虚拟键码和扫描码，以及指示键事件状态的标志。 `InputText` 方法是一个公共静态方法，它将字符串作为输入，将字符串中的每个字符转换为一系列键盘输入事件，并将这些事件发送给操作系统。

张赐荣: C# 调用 SendInput 模拟输入中文

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