模拟键盘操作Windows应用程序

这是针对Windows系统录音软件的小程序

目的是把声音文件的频率转换的低一些

尝试过用WINDOWS API来做这个事，结果失败了

最后还是用程序操作EXE文件完成工作的

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

namespace ShengYin2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            folderBrowserDialog1.ShowNewFolderButton = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DialogResult dr = folderBrowserDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                label1.Text = "路径：" + folderBrowserDialog1.SelectedPath;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Process myProc = new Process();
            myProc.StartInfo.FileName = @"C:\wINDOWS\system32\sndrec32.exe";
            myProc.StartInfo.UseShellExecute = false;
            myProc.StartInfo.RedirectStandardInput = true;
            myProc.Start();
            DirectoryInfo di = new DirectoryInfo(folderBrowserDialog1.SelectedPath);
            FileInfo[] fis = di.GetFiles();
            foreach (var a in fis)
            {
                if (a.Extension.Contains("wav"))
                {
                    Thread.Sleep(600);
                    SendKeys.SendWait("%f");
                    Thread.Sleep(600);
                    SendKeys.SendWait("o");
                    Thread.Sleep(600);
                    SendKeys.SendWait(a.FullName);
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Enter}");
                    Thread.Sleep(600);
                    SendKeys.SendWait("%f");
                    Thread.Sleep(600);
                    SendKeys.SendWait("a");
                    Thread.Sleep(600);
                    SendKeys.SendWait("%c");
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Down}");
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Down}");
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Enter}");
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Enter}");
                    Thread.Sleep(600);
                    SendKeys.SendWait("{Enter}");
                }
            }
            myProc.Close();
            MessageBox.Show("转换完成");
        }
    }
}