c#pdf file home page batch adds photo watermarks and makes the pdf file name consistent with the subdirectory file name and adds a progress bar that can be terminated at any time
using Spire.Pdf;
using Spire.Pdf.Annotations;
using Spire.Pdf.Graphics;
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;
using System.Xml.Linq;
using System.Threading;
namespace WindowsFormsApp1
{<!-- -->
public partial class Form1 : Form
{<!-- -->
private BackgroundWorker worker;
private bool stopProgress;
private bool isTerminated;
public Form1()
{<!-- -->
InitializeComponent();
button1.Click + = new System.EventHandler(button1_Click);
button2.Click + = new System.EventHandler(stopButton_Click);
//Initialize BackgroundWorker
worker = new BackgroundWorker();
worker.WorkerReportsProgress = true;
worker.WorkerSupportsCancellation = true; //Set to support cancellation operation
worker.DoWork + = Worker_DoWork;
worker.ProgressChanged + = Worker_ProgressChanged;
worker.RunWorkerCompleted + = Worker_RunWorkerCompleted;
}
//Watermark photo storage path
string watermarkImagePath = "C:\Users\20755\Desktop\test\444.png";
//string watermarkImagePath = "C:\Users\\Administrator\Desktop\test\444.png";
//string extName = "*.pdf";
//List<string> nameList = new List<string>();
private void button1_Click(object sender, EventArgs e)
{<!-- -->
FolderBrowserDialog folder = new FolderBrowserDialog();
folder.Description = "Open Folder";
if (folder.ShowDialog() == DialogResult.OK)
{<!-- -->
// disable button
button1.Enabled = false;
//Start BackgroundWorker to perform background operations
worker.RunWorkerAsync(folder.SelectedPath);
}
}
// Background operation to generate watermarked function
private void Worker_DoWork(object sender, DoWorkEventArgs e)
{<!-- -->
try
{<!-- -->
string folderPath = e.Argument as string;
string[] pdfFiles = Directory.GetFiles(folderPath, "*.pdf", SearchOption.AllDirectories);
int totalFiles = pdfFiles.Length;
int processedFiles = 0;
foreach (string pdfFile in pdfFiles)
{<!-- -->
if (worker.CancellationPending)
{<!-- -->
e.Cancel = true;
return;
}
using (PdfDocument document = new PdfDocument())
{<!-- -->
document.LoadFromFile(pdfFile);
PdfPageBase firstPage = document.Pages[0]; // Get the first page
//Add watermark
Image image = Image.FromFile(watermarkImagePath);
int imgWidth = image.Width;
int imgHeight = image.Height;
float pageWidth = firstPage.ActualSize.Width;
float pageHeight = firstPage.ActualSize.Height;
firstPage.BackgroundOpacity = 1f;
firstPage.BackgroundImage = image;
Rectangle rect = new Rectangle(200, 0, 200, 125);
firstPage.BackgroundRegion = rect;
//string outputFolder = "C:\Users\Administrator\Desktop\test\
ewDir";
string outputFolder = "C:\Users\20755\Desktop\test\\
ewDir";
Directory.CreateDirectory(outputFolder);
// Relative path: get the directory name based on the location of the pdf and start intercepting from the folder location selected at the beginning
//Equivalent to pdfFile= C:\Users\\Administrator\Desktop\test\111\1.pdf
//relativePath =\test\111\1.pdf
string relativePath = Path.GetDirectoryName(pdfFile).Substring(folderPath.Length);
if (relativePath.StartsWith("\"))
//If the path starts with \, then intercept it from position 2
//relativePath =111 The purpose of doing this is actually to get the directory folder name of the upper level of the pdf
//If it is multi-level nesting, the logic of this place needs to be added.
relativePath = relativePath.Substring(1);
// Directory name Make sure the file name and directory name are consistent
string dirName = Path.GetFileName(Path.GetDirectoryName(pdfFile));
// new folder
string newFolderPath = Path.Combine(outputFolder, relativePath);
Directory.CreateDirectory(newFolderPath);
//Rename the file name according to the directory
string newFileName = dirName + ".pdf";
string newFilePath = Path.Combine(newFolderPath, newFileName);
//string outputFilePath = Path.Combine(newFolderPath, Path.GetFileName(pdfFile));
document.SaveToFile(newFilePath);
document.Close();
processedFiles + + ;
//Send progress report
int progressPercentage = (int)((float)processedFiles / totalFiles * 100);
worker.ReportProgress(progressPercentage);
}
}
}
catch(Exceptioner)
{<!-- -->
// Handle any exceptions
}
}
// Progress report update UI
private void Worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{<!-- -->
//Update the value of the progress bar
progressBar1.Value = e.ProgressPercentage;
}
//Background operation completed
private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{<!-- -->
if (e.Cancelled)
{<!-- -->
MessageBox.Show("Progress has been terminated!");
}
else if (e.Error != null)
{<!-- -->
MessageBox.Show("An error occurred:" + e.Error.Message);
}
else
{<!-- -->
MessageBox.Show("Watermark added successfully!");
}
// enable button
button1.Enabled = true;
//End application
Application.Exit();
}
private void stopButton_Click(object sender, EventArgs e)
{<!-- -->
// Set flag variable to terminate progress
stopProgress = true;
// Terminate BackgroundWorker
if (worker.IsBusy)
{<!-- -->
worker.CancelAsync();
}
}
}
}