PdfOperator/FrmPdfToTxt.cs

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using iTextSharp.text.pdf.parser;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PdfOperator
{
    public partial class FrmPdfToTxt : Form
    {
        public FrmPdfToTxt()
        {
            InitializeComponent();
        }

        private void btnOpenfile_Click(object sender, EventArgs e)
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.Title = "打开PDF";
            fileDialog.Filter = "pdf文件|*.pdf";
            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                string name = fileDialog.FileName;
                txtFilePath.Text = name;
            }
        }

        private void btnSavePath_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtFilePath.Text))
            {
                MessageBox.Show("请先选择要操作的pdf！");
                return;
            }
            SaveFileDialog saveFile = new SaveFileDialog();
            saveFile.Title = "选择保存路径";
            saveFile.Filter = "txt文件|*.txt";
            saveFile.DefaultExt = ".txt";
            saveFile.FileName = "pdf转为txt的文件.txt";
            if (saveFile.ShowDialog() == DialogResult.OK)
            {
                txtSavePath.Text = saveFile.FileName;
            }
        }


        /// <summary>
        /// 开始转换为txt
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txtFilePath.Text))