C#模拟按键操作，无需将鼠标移动到窗体key浏览器

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

class Program
{
    // 导入Windows API函数
    [DllImport("user32.dll")]
    public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

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

    [DllImport("user32.dll")]
    public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

    // 定义常量
    const uint WM_KEYDOWN = 0x0100;
    const uint WM_KEYUP = 0x0101;

    static void Main(string[] args)
    {
        // 查找窗口句柄
        IntPtr mainWindowHandle = FindWindow(null, "窗口标题");
        IntPtr targetWindowHandle = FindWindowEx(mainWindowHandle, IntPtr.Zero, "Chrome_WidgetWin_1", null);

        // 模拟按键操作
        SimulateKeyPress(targetWindowHandle, 'A');
        Thread.Sleep(1000); // 等待1秒
        SimulateKeyPress(targetWindowHandle, 'B');
    }

    static void SimulateKeyPress(IntPtr targetWindowHandle, char key)
    {
        // 发送按键按下消息
        SendMessage(targetWindowHandle, WM_KEYDOWN, (IntPtr)key, IntPtr.Zero);
        // 发送按键释放消息
        SendMessage(targetWindowHandle, WM_KEYUP, (IntPtr)key, IntPtr.Zero);
    }
}