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 iTextSharp.text;using iTextSharp.text.pdf;using System.IO;namespace PDF{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } int iPageNum; string filePath = ""; private void button1_Click(object sender, EventArgs e) { if (filePath == "") { MessageBox.Show("选择PDF文件无效！", "文件无效！"); } else { if (numericUpDownEndPageNum.Value > iPageNum) { MessageBox.Show("最大页码值有误！请检查！", "页码有误！"); } else if (numericUpDownStartPageNum.Value < 1) { MessageBox.Show("最小页码值有误！请检查！", "页码有误！"); } else if (numericUpDownStartPageNum.Value > numericUpDownEndPageNum.Value) { MessageBox.Show("最小页码值比最大页码值大！请检查！", "页码有误！"); } else { string splitPDFPath = filePath.Remove(filePath.Length - 4) "(" numericUpDownStartPageNum.Value.ToString() "-" numericUpDownEndPageNum.Value.ToString() ").pdf"; int startPageNum = int.Parse(numericUpDownStartPageNum.Value.ToString()); int endPageNum = int.Parse(numericUpDownEndPageNum.Value.ToString()); copypdf(startPageNum, endPageNum, filePath, splitPDFPath); MessageBox.Show("处理完毕！","提示"); } } } private void copypdf(int StartPage, int EndPage, string file1, string splitFileName) //将file1中页码StartPage到EndPage的文件拷贝至splitFileName { iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(file1); Document document = new Document(reader.GetPageSizeWithRotation(StartPage)); //创建document对象 PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(splitFileName, FileMode.Create)); //实例化document对象 document.Open(); int rotation; PdfContentByte cb = writer.DirectContent; PdfImportedPage page; while (StartPage <= EndPage) { document.SetPageSize(reader.GetPageSizeWithRotation(StartPage)); document.NewPage(); page = writer.GetImportedPage(reader, StartPage); rotation = reader.GetPageRotation(StartPage); if (rotation == 90 || rotation == 270) { //document.NewPage(); if (rotation == 90) { cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(StartPage).Height); } if (rotation == 270) { cb.AddTemplate(page, 0, 1.0F, -1.0F, 0, reader.GetPageSizeWithRotation(StartPage).Width, 0); } } else { cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0); } StartPage ; } try { document.Close(); reader = null; } catch (Exception ex) { MessageBox.Show(ex.Message.ToString()); } } private void button2_Click(object sender, EventArgs e) { OpenFileDialog myBlockDialog = new OpenFileDialog(); myBlockDialog.Filter = "PDF文件(*.pdf)|*.pdf"; myBlockDialog.Title = "打开PDF文件"; myBlockDialog.ShowDialog(); filePath = myBlockDialog.FileName; if (filePath == "") { MessageBox.Show("选择PDF文件无效！", "文件无效！"); //Application.Exit(); } labSelectInfo.Text = "已选择PDF文件：" filePath; //iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(filePath); Document document = new Document(); //PdfWriter.GetInstance(document,new FileStream(filePath,FileMode.Open)); PdfReader reader = new PdfReader(filePath); iPageNum = reader.NumberOfPages; reader.Close(); //不关闭会一直占用pdf资源，对接下来的操作会有影响 //PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(splitFileName, FileMode.Create)); labMaxPageNum.Text = @"/" iPageNum.ToString(); } private void button3_Click(object sender, EventArgs e) { Document doc = new Document(PageSize.A4); PdfWriter.GetInstance(doc,new FileStream("test1.pdf",FileMode.Create)); doc.Open(); doc.Add(new Paragraph("Hello!")); doc.Close(); } private void numericUpDownStartPageNum_ValueChanged(object sender, EventArgs e) { } }}
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