说明：
直接上程序，大家可以通过程序来学习！
项目引用到的dll：
itextsharp.dll
O2S.Components.PDFRender4NET.dll
引入的命名空间：
using O2S.Components.PDFRender4NET;
using iTextSharp.text;
using iTextSharp.text.pdf;
源码：
源码主要分为三部分：分别为主窗体MainForm、Pdf2Pic.cs、Pic2Pdf.cs，接下来我们一步一步来。
1.主窗体MainForm.cs：
界面布局：
源码：
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Threading;
using System.Windows.Forms;
using iTextSharp.text.pdf;//项目新添加
namespace PDF_Image
{
public partial class MainForm : Form
{
public static string sourcepath = "";//PDF文件源路径
public static string targetpath = "";//PDF文件转化成Image保存的路径
public static string movepath = "";//PDF文件转换后移动的路径
public static string sourcepath1 = "";//Image文件源地址
public static string targetpath1 = "";//Image文件转换成PDF文件保存的路径
public static string movepath1 = "";//Image文件转换后移动的路径
private Thread th_PDFtoImg = null; //PDF转图片线程
private Thread th_ImgtoPDF = null; //图片转PDF线程
public MainForm()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
/// <summary>
/// 窗体加载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MainForm_Load(object sender, EventArgs e)
{
sourcepath = txt_PDF1.Text = AppDomain.CurrentDomain.BaseDirectory + @"PDF1";
targetpath = txt_PDF2.Text = AppDomain.CurrentDomain.BaseDirectory + @"Image1";
movepath = txt_PDF3.Text = AppDomain.CurrentDomain.BaseDirectory + @"Endswap1";
sourcepath1 = txt_Image1.Text = AppDomain.CurrentDomain.BaseDirectory + @"Image2";
targetpath1 = txt_Image2.Text = AppDomain.CurrentDomain.BaseDirectory + @"PDF2";
movepath1 = txt_Image3.Text = AppDomain.CurrentDomain.BaseDirectory + @"Endswap2";
}
#region PDF转图片
public void PDFtoImage()
{
Files_Copy(sourcepath);
}
/// <summary>
/// 显示文件夹下所有子文件夹及文件的名称
/// </summary>
/// <param name="Sdir">文件夹目录</param>
private void Files_Copy(string Sdir)
{
DirectoryInfo dir = new DirectoryInfo(Sdir);
try
{
if (dir.Exists)//判断所指的文件或文件夹是否存在
{
DirectoryInfo dirD = dir as DirectoryInfo;//如果给定参数不是文件夹则退出
if (dirD != null)//判断文件夹是否为空
{
FileSystemInfo[] files = dirD.GetFileSystemInfos();//获取文件夹中所有文件和文件夹
if (files.Length == 0)//判断文件夹是否为空
{
MessageBox.Show("There are no files in the current folder!");
//Thread.Sleep(10000);
}
else
{
//对单个FileSystemInfo进行判断,如果是文件夹则进行递归操作
foreach (FileSystemInfo FSys in files)
{
FileInfo file = FSys as FileInfo;
if (file != null)//如果是文件的话，进行文件的复制操作
{
FileInfo SFInfo = new FileInfo(file.DirectoryName + "\\" + file.Name);//获取文件所在的原始路径
string pdfPath = SFInfo.FullName;
PdfReader reader = new PdfReader(pdfPath);
int iPageNum = reader.NumberOfPages;
Pdf2Pic.ConvertPDF2Image(pdfPath, targetpath + "\\", DateTime.Now.ToString("yyyyMMddHHmmssfff") + "_", 1, iPageNum, ImageFormat.Png, Pdf2Pic.Definition.Ten);
//转换好后移动PDF文件
if (File.Exists(movepath + "\\" + file.Name))
{
//参数1：要删除的文件路径
File.Delete(movepath + "\\" + file.Name);
}
File.Move(pdfPath, movepath + "\\" + file.Name);
}
}
MessageBox.Show("\"PDF to Image\" has finished!");
}
}
}
btn_PdfStart.Enabled = true;
lbl_Pdf.Text = "End";
lbl_Pdf.ForeColor = Color.Red;
}
catch (Exception ex)
{
//MessageBox.Show(ex.Message);
btn_PdfStart.Enabled = true;
lbl_Pdf.Text = "End";
lbl_Pdf.ForeColor = Color.Red;
return;
}
}
private void btn_PDF1_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_PDF1.Text);
}
private void btn_PDF2_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_PDF2.Text);
}
private void btn_PDF3_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_PDF3.Text);
}
private void btn_PdfStart_Click(object sender, EventArgs e)
{
if (th_PDFtoImg != null)
{
th_PDFtoImg.Abort();
th_PDFtoImg = null;
}
btn_PdfStart.Enabled = false;
th_PDFtoImg = new Thread(new ThreadStart(PDFtoImage)); //创建一个线程
th_PDFtoImg.IsBackground = true;
th_PDFtoImg.Start(); //执行当前线程
lbl_Pdf.Text = "Running...";
lbl_Pdf.ForeColor = Color.Lime;
}
private void btn_PdfStop_Click(object sender, EventArgs e)
{
if (th_PDFtoImg != null)
{
th_PDFtoImg.Abort();
th_PDFtoImg = null;
btn_PdfStart.Enabled = true;
lbl_Pdf.Text = "End";
lbl_Pdf.ForeColor = Color.Red;
}
}
#endregion
#region 图片转PDF
public void ImagetoPDF()
{
Files_Copy1(sourcepath1);
}
private void Files_Copy1(string Sdir)
{
DirectoryInfo dir = new DirectoryInfo(Sdir);
try
{
if (dir.Exists)//判断所指的文件或文件夹是否存在
{
DirectoryInfo dirD = dir as DirectoryInfo;//如果给定参数不是文件夹则退出
if (dirD != null)//判断文件夹是否为空
{
FileSystemInfo[] files = dirD.GetFileSystemInfos();//获取文件夹中所有文件和文件夹
if (files.Length == 0)//判断文件夹是否为空
{
MessageBox.Show("There are no files in the current folder!");
//Thread.Sleep(10000);
}
else
{
//对单个FileSystemInfo进行判断,如果是文件夹则进行递归操作
foreach (FileSystemInfo FSys in files)
{
FileInfo file = FSys as FileInfo;
if (file != null)//如果是文件的话，进行文件的复制操作
{
FileInfo SFInfo = new FileInfo(file.DirectoryName + "\\" + file.Name);//获取文件所在的原始路径
string frompath = SFInfo.FullName;
string oldname = file.Name;
string newfileName;
if (oldname.Contains("Png"))
{
newfileName = oldname.Replace(".Png", ".pdf");
if (File.Exists(targetpath1 + "\\" + newfileName))
{
//参数1：要删除的文件路径
File.Delete(targetpath1 + "\\" + newfileName);
}
Pic2Pdf.ImageToPdf(frompath, targetpath1 + "\\" + newfileName);
}
else if (oldname.Contains("png"))
{
newfileName = oldname.Replace(".png", ".pdf");
if (File.Exists(targetpath1 + "\\" + newfileName))
{
//参数1：要删除的文件路径
File.Delete(targetpath1 + "\\" + newfileName);
}
Pic2Pdf.ImageToPdf(frompath, targetpath1 + "\\" + newfileName);
}
if (File.Exists(movepath1 + "\\" + file.Name))
{
//参数1：要删除的文件路径
File.Delete(movepath1 + "\\" + file.Name);
}
File.Move(frompath, movepath1 + "\\" + file.Name);
}
}
MessageBox.Show("\"Image to PDF\" has finished!");
}
}
}
btn_ImageStart.Enabled = true;
lbl_Image.Text = "End";
lbl_Image.ForeColor = Color.Red;
}
catch (Exception ex)
{
//MessageBox.Show(ex.Message);
btn_ImageStart.Enabled = true;
lbl_Image.Text = "End";
lbl_Image.ForeColor = Color.Red;
return;
}
}
private void btn_Image1_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_Image1.Text);
}
private void btn_Image2_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_Image2.Text);
}
private void btn_Image3_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("explorer.exe", txt_Image3.Text);
}
private void btn_ImageStart_Click(object sender, EventArgs e)
{
if (th_ImgtoPDF != null)
{
th_ImgtoPDF.Abort();
th_ImgtoPDF = null;
}
btn_ImageStart.Enabled = false;
th_ImgtoPDF = new Thread(new ThreadStart(ImagetoPDF)); //创建一个线程
th_ImgtoPDF.IsBackground = true;
th_ImgtoPDF.Start(); //执行当前线程
//Pic2Pdf.ImageToPdf(frompath, topath);
//MessageBox.Show("转换成功1");
lbl_Image.Text = "Running...";
lbl_Image.ForeColor = Color.Lime;
}
private void btn_ImageStop_Click(object sender, EventArgs e)
{
if (th_ImgtoPDF != null)
{
th_ImgtoPDF.Abort();
th_ImgtoPDF = null;
btn_ImageStart.Enabled = true;
lbl_Image.Text = "End";
lbl_Image.ForeColor = Color.Red;
}
}
#endregion
}
}
2.Pdf2Pic.cs：
源码：
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using O2S.Components.PDFRender4NET;//添加的
namespace PDF_Image
{
public static class Pdf2Pic
{
public enum Definition
{
One = 1, Two = 2, Three = 3, Four = 4, Five = 5,
Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
}
/// <summary>
/// 将PDF文档转换为图片的方法
/// </summary>
/// <param name="pdfInputPath">PDF文件路径</param>
/// <param name="imageOutputPath">图片输出路径</param>
/// <param name="imageName">生成图片的名字</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
/// <param name="imageFormat">设置所需图片格式</param>
/// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
{
PDFFile pdfFile = PDFFile.Open(pdfInputPath);
if (!Directory.Exists(imageOutputPath))
{
Directory.CreateDirectory(imageOutputPath);
}
if (startPageNum <= 0)
{
startPageNum = 1;
}
if (endPageNum > pdfFile.PageCount)
{
endPageNum = pdfFile.PageCount;
}
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
for (int i = startPageNum; i <= endPageNum; i++)
{
Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition);
pageImage.Save(imageOutputPath + imageName + i.ToString("000") + "." + imageFormat.ToString(), imageFormat);
pageImage.Dispose();
}
pdfFile.Dispose();
}
}
}
3.Pic2Pdf.cs：
源码：
using System.IO;
using iTextSharp.text;//添加的
using iTextSharp.text.pdf;//添加的
namespace PDF_Image
{
public static class Pic2Pdf
{
public static void ImageToPdf(string frompath, string topath)
{
System.Drawing.Image pic = System.Drawing.Image.FromFile(frompath);//strFilePath是该图片的绝对路径
int intWidth = pic.Width;//长度像素值
int intHeight = pic.Height;//高度像素值
pic.Dispose();
iTextSharp.text.Rectangle pagesize = new iTextSharp.text.Rectangle(intWidth, intHeight);
Document pdfdoc = new Document(pagesize);//建立Document对象的实例,并设置Document的大小与边距。
PdfWriter writer = PdfWriter.GetInstance(pdfdoc, new FileStream(topath, FileMode.Create)); //建立一个Pdf Writer对象Writer与document对象关联,通过Writer可以将文档写入到磁盘中。
pdfdoc.Open(); //打开文档。
PdfContentByte cb = writer.DirectContent;
iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(frompath);
img.SetAbsolutePosition(0, 0);
cb.AddImage(img); //向文档中添加图像数据。
pdfdoc.NewPage();
pdfdoc.Close(); //关闭文档,将缓冲区的内容写入磁盘以保存文件。
}
}
}
运行效果：
可实现功能：
1.PDF转换成图片：
将PDF文件按页转换成.Png图片格式，转换结束会有提示
（转换过的文件将自动移动到对应的文件夹，防止多次转换）
2.图片转换成PDF：
可以将单张照片(.Png/.png)分别转换成.pdf文件，转换结束会有提示
（转换过的图片将自动移动到对应的文件夹，防止多次转换）
过程展示：
进一步延伸：
大家可以根据此源码，进一步扩展生成的图片格式（例.jpg等其他格式），以及转换成PDF文件的源图片的格式（例.jpg等其他格式），扩展程序的通用性。
另外，可以考虑如何把多个PDF文件进行合并。
源码下载：
https://blog.csdn.net/sinat_40003796?spm=1000.2115.3001.5343
