c#实现模拟键盘定位将扫到的条码发送到另一个软件的文本框

在C#中模拟键盘定位可以使用Windows API中的SendInput函数来实现。具体步骤如下：

1. 引用Windows API中的SendInput函数。

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

2. 创建INPUT结构体，用于描述要发送的键盘输入信息。

[StructLayout(LayoutKind.Sequential)]
public struct INPUT
{
    public uint Type;
    public InputUnion Data;
}

[StructLayout(LayoutKind.Explicit)]
public struct InputUnion
{
    [FieldOffset(0)]
    public MOUSEINPUT Mouse;
    [FieldOffset(0)]
    public KEYBDINPUT Keyboard;
    [FieldOffset(0)]
    public HARDWAREINPUT Hardware;
}

[StructLayout(LayoutKind.Sequential)]
public struct KEYBDINPUT
{
    public ushort VirtualKey;
    public ushort ScanCode;
    public uint Flags;
    public uint Time;
    public IntPtr ExtraInfo;
}

3. 创建发送信息的数组，包括按下键和松开键的信息。

INPUT[] inputs = new INPUT[2];
inputs[0] = new INPUT();
inputs[0].Type = 1; // 1表示键盘输入
inputs[0].Data.Keyboard = new KEYBDINPUT();
inputs[0].Data.Keyboard.VirtualKey = (ushort)Keys.Enter; // 发送Enter键
inputs[0].Data.Keyboard.ScanCode = 0;
inputs[0].Data.Keyboard.Flags = 0;
inputs[0].Data.Keyboard.Time = 0;
inputs[0].Data.Keyboard.ExtraInfo = IntPtr.Zero;

inputs[1] = new INPUT();
inputs[1].Type = 1;
inputs[1].Data.Keyboard = new KEYBDINPUT();
inputs[1].Data.Keyboard.VirtualKey = 0;
inputs[1].Data.Keyboard.ScanCode = (ushort)(MapVirtualKey((uint)Keys.Enter, 0) << 16); // 发送松开键的信息
inputs[1].Data.Keyboard.Flags = 2;
inputs[1].Data.Keyboard.Time = 0;
inputs[1].Data.Keyboard.ExtraInfo = IntPtr.Zero;

4. 调用SendInput函数发送输入信息。

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

5. 将扫到的条码发送到另一个软件的文本框中，可以使用Windows API中的SendMessage函数来实现。具体步骤如下：

[DllImport("User32.dll", EntryPoint = "SendMessage")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, string lParam);

6. 获取另一个软件的文本框句柄，并将扫到的条码发送到文本框中。

IntPtr handle = FindWindow(null, "另一个软件的标题"); // 获取另一个软件的窗口句柄
SendMessage(handle, WM_SETTEXT, 0, "扫到的条码"); // 发送文本信息到窗口

完整代码示例如下：

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace SendBarcode
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

        [DllImport("user32.dll")]
        static extern uint MapVirtualKey(uint uCode, uint uMapType);

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, string lParam);

        const int WM_SETTEXT = 0x000C;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // 创建发送信息的数组
            INPUT[] inputs = new INPUT[2];
            inputs[0] = new INPUT();
            inputs[0].Type = 1; // 1表示键盘输入
            inputs[0].Data.Keyboard = new KEYBDINPUT();
            inputs[0].Data.Keyboard.VirtualKey = (ushort)Keys.Enter; // 发送Enter键
            inputs[0].Data.Keyboard.ScanCode = 0;
            inputs[0].Data.Keyboard.Flags = 0;
            inputs[0].Data.Keyboard.Time = 0;
            inputs[0].Data.Keyboard.ExtraInfo = IntPtr.Zero;

            inputs[1] = new INPUT();
            inputs[1].Type = 1;
            inputs[1].Data.Keyboard = new KEYBDINPUT();
            inputs[1].Data.Keyboard.VirtualKey = 0;
            inputs[1].Data.Keyboard.ScanCode = (ushort)(MapVirtualKey((uint)Keys.Enter, 0) << 16); // 发送松开键的信息
            inputs[1].Data.Keyboard.Flags = 2;
            inputs[1].Data.Keyboard.Time = 0;
            inputs[1].Data.Keyboard.ExtraInfo = IntPtr.Zero;

            // 发送键盘输入信息
            SendInput((uint)inputs.Length, inputs, Marshal.SizeOf(typeof(INPUT)));

            // 获取另一个软件的文本框句柄，并将扫到的条码发送到文本框中
            IntPtr handle = FindWindow(null, "另一个软件的标题");
            SendMessage(handle, WM_SETTEXT, 0, "扫到的条码");
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct INPUT
    {
        public uint Type;
        public InputUnion Data;
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct InputUnion
    {
        [FieldOffset(0)]
        public MOUSEINPUT Mouse;
        [FieldOffset(0)]
        public KEYBDINPUT Keyboard;
        [FieldOffset(0)]
        public HARDWAREINPUT Hardware;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct KEYBDINPUT
    {
        public ushort VirtualKey;
        public ushort ScanCode;
        public uint Flags;
        public uint Time;
        public IntPtr ExtraInfo;
    }
}