附件，指随同文件发出的有关文件或物品。在PDF文档中，我们可以添加同类型的或其他类型的文档作为附件内容，而PDF中附件也可以分为两种存在形式，一种是附件以普通文件形式存在，另一种是以注释的形式存在。在下面的示例中介绍了如何分别添加以上两种形式的PDF附件。此外，根据PDF附件的不同添加方式，我们在获取PDF附件信息或删除PDF附件时，也可以分情况来执行操作。
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1.添加PDF附件
1.1 以普通文档形式添加附件
1.2 以文档注释形式添加附件
2.获取PDF附件
2.1 获取文件附件
2.2 获取注释附件
3.删除PDF附件
3.1 删除文件附件
3.2 删除注释附件
Spire.PDF for .NET 4.0
using Spire.Pdf;
using Spire.Pdf.Attachments;
namespace AddAttachment_PDF
{
class Program
{
static void Main(string[] args)
{
//创建一个PdfDocument类对象，加载测试文档
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("sample.pdf");
//初始化PdfAttachment类实例，加载需要附加的文档
PdfAttachment attachment = new PdfAttachment("New.pdf");
//将文档添加到原PDF文档的附件集合中
pdf.Attachments.Add(attachment);
//保存并打开文档
pdf.SaveToFile("Attachment1.pdf");
System.Diagnostics.Process.Start("Attachment1.pdf");
}
}
}
测试结果：
Imports Spire.Pdf
Imports Spire.Pdf.Attachments
Namespace AddAttachment_PDF
Class Program
Private Shared Sub Main(ByVal args As String())
Dim pdf As PdfDocument = New PdfDocument()
pdf.LoadFromFile("sample.pdf")
Dim attachment As PdfAttachment = New PdfAttachment("New.pdf")
pdf.Attachments.Add(attachment)
pdf.SaveToFile("Attachment1.pdf")
System.Diagnostics.Process.Start("Attachment1.pdf")
End Sub
End Class
End Namespace
using Spire.Pdf;
using Spire.Pdf.Annotations;
using Spire.Pdf.Graphics;
using System;
using System.Drawing;
using System.IO;
namespace AddAttachment2
{
class Program
{
static void Main(string[] args)
{
//创建一个PdfDocument类对象，加载测试文档
PdfDocument doc = new PdfDocument("sample.pdf");
//给添加一个新页面到文档
PdfPageBase page = doc.Pages.Add();
//添加文本到页面，并设置文本格式（字体、题号、字体粗细、颜色、文本位置等）
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Arial", 16f, System.Drawing.FontStyle.Bold));
page.Canvas.DrawString("Attachments:", font1, PdfBrushes.CornflowerBlue, new Point(50, 50));
//将文档作为注释添加到页面
PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Arial", 12f, System.Drawing.FontStyle.Bold));
PointF location = new PointF(52, 80);
//设置注释标签，标签内容为作为附件的文档
String label = "sample.docx";
byte[] data = File.ReadAllBytes("sample.docx");
SizeF size = font2.MeasureString(label);
//设置注释位置、大小、颜色、标签类型以及显示文本等
RectangleF bounds = new RectangleF(location, size);
page.Canvas.DrawString(label, font2, PdfBrushes.MediumPurple, bounds);
bounds = new RectangleF(bounds.Right + 3, bounds.Top, font2.Height / 2, font2.Height);
PdfAttachmentAnnotation annotation1 = new PdfAttachmentAnnotation(bounds, "sample.docx", data);
annotation1.Color = Color.Purple;
annotation1.Flags = PdfAnnotationFlags.NoZoom;
annotation1.Icon = PdfAttachmentIcon.Graph;
annotation1.Text = "sample.docx";
(page as PdfNewPage).Annotations.Add(annotation1);
//保存并打开文档
doc.SaveToFile("Attachment2.pdf");
System.Diagnostics.Process.Start("Attachment2.pdf");
}
}
}
测试结果：
Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Imports Spire.Pdf.Graphics
Imports System
Imports System.Drawing
Imports System.IO
Namespace AddAttachment2
Class Program
Private Shared Sub Main(ByVal args As String())
Dim doc As PdfDocument = New PdfDocument("sample.pdf")
Dim page As PdfPageBase = doc.Pages.Add()
Dim font1 As PdfTrueTypeFont = New PdfTrueTypeFont(New Font("Arial", 16F, System.Drawing.FontStyle.Bold))
page.Canvas.DrawString("Attachments:", font1, PdfBrushes.CornflowerBlue, New Point(50, 50))
Dim font2 As PdfTrueTypeFont = New PdfTrueTypeFont(New Font("Arial", 12F, System.Drawing.FontStyle.Bold))
Dim location As PointF = New PointF(52, 80)
Dim label As String = "sample.docx"
Dim data As Byte() = File.ReadAllBytes("sample.docx")
Dim size As SizeF = font2.MeasureString(label)
Dim bounds As RectangleF = New RectangleF(location, size)
page.Canvas.DrawString(label, font2, PdfBrushes.MediumPurple, bounds)
bounds = New RectangleF(bounds.Right + 3, bounds.Top, font2.Height / 2, font2.Height)
Dim annotation1 As PdfAttachmentAnnotation = New PdfAttachmentAnnotation(bounds, "sample.docx", data)
annotation1.Color = Color.Purple
annotation1.Flags = PdfAnnotationFlags.NoZoom
annotation1.Icon = PdfAttachmentIcon.Graph
annotation1.Text = "sample.docx"
(TryCast(page, PdfNewPage)).Annotations.Add(annotation1)
doc.SaveToFile("Attachment2.pdf")
System.Diagnostics.Process.Start("Attachment2.pdf")
End Sub
End Class
End Namespace
using Spire.Pdf;
using Spire.Pdf.Attachments;
using System;
using System.IO;
namespace GetAttachment_PDF
{
class Program
{
static void Main(string[] args)
{
//创建PDF文档，加载测试文件
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("Attachment1.pdf");
//获取文档中的第一个文件附件
PdfAttachment attachment = pdf.Attachments[0];
//获取该附件的信息
Console.WriteLine("Name: {0}", attachment.FileName);
Console.WriteLine("MimeType: {0}", attachment.MimeType);
Console.WriteLine("Description: {0}", attachment.Description);
Console.WriteLine("Creation Date: {0}", attachment.CreationDate);
Console.WriteLine("Modification Date: {0}", attachment.ModificationDate);
//将附件的数据写入到新文档
File.WriteAllBytes(attachment.FileName, attachment.Data);
Console.ReadKey();
}
}
}
测试结果：
Imports Spire.Pdf
Imports Spire.Pdf.Attachments
Imports System
Imports System.IO
Namespace GetAttachment_PDF
Class Program
Private Shared Sub Main(ByVal args As String())
Dim pdf As PdfDocument = New PdfDocument()
pdf.LoadFromFile("Attachment1.pdf")
Dim attachment As PdfAttachment = pdf.Attachments(0)
Console.WriteLine("Name: {0}", attachment.FileName)
Console.WriteLine("MimeType: {0}", attachment.MimeType)
Console.WriteLine("Description: {0}", attachment.Description)
Console.WriteLine("Creation Date: {0}", attachment.CreationDate)
Console.WriteLine("Modification Date: {0}", attachment.ModificationDate)
File.WriteAllBytes(attachment.FileName, attachment.Data)
Console.ReadKey()
End Sub
End Class
End Namespace
using Spire.Pdf;
using Spire.Pdf.Annotations;
using System.Collections.Generic;
using System.IO;
namespace GetAttachment2
{
class Program
{
static void Main(string[] args)
{
//加载PDF文档
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("Attachment2.pdf");
//实例化一个list并将文档内所有页面的Attachment annotations添加到该list
List attaches = new List();
foreach (PdfPageBase page in pdf.Pages)
{
foreach (PdfAnnotation annotation in page.AnnotationsWidget)
{
attaches.Add(annotation as PdfAttachmentAnnotationWidget);
}
}
//遍历list，将附件数据写入到新文档
for (int i = 0; i < attaches.Count; i++)
{
File.WriteAllBytes(attaches[i].FileName, attaches[i].Data);
}
}
}
}
测试结果：
Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Imports System.Collections.Generic
Imports System.IO
Namespace GetAttachment2
Class Program
Private Shared Sub Main(ByVal args As String())
Dim pdf As PdfDocument = New PdfDocument()
pdf.LoadFromFile("Attachment2.pdf")
Dim attaches As List(Of PdfAttachmentAnnotationWidget) = New List(Of PdfAttachmentAnnotationWidget)()
For Each page As PdfPageBase In pdf.Pages
For Each annotation As PdfAnnotation In page.AnnotationsWidget
attaches.Add(TryCast(annotation, PdfAttachmentAnnotationWidget))
Next
Next
For i As Integer = 0 To attaches.Count - 1
File.WriteAllBytes(attaches(i).FileName, attaches(i).Data)
Next
End Sub
End Class
End Namespace
using Spire.Pdf;
namespace DeleteAttachment_PDF
{
class Program
{
static void Main(string[] args)
{
//加载PDF文档
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("Attachment1.pdf");
//删除文档的所有文件附件
for (int i = 0; i < pdf.Attachments.Count; i++)
{
pdf.Attachments.RemoveAt(i);
}
//保存并打开文档
pdf.SaveToFile("Remove.pdf");
System.Diagnostics.Process.Start("Remove.pdf");
}
}
}
Imports Spire.Pdf
Namespace DeleteAttachment_PDF
Class Program
Private Shared Sub Main(ByVal args As String())
Dim pdf As PdfDocument = New PdfDocument()
pdf.LoadFromFile("Attachment1.pdf")
For i As Integer = 0 To pdf.Attachments.Count - 1
pdf.Attachments.RemoveAt(i)
Next
pdf.SaveToFile("Remove.pdf")
System.Diagnostics.Process.Start("Remove.pdf")
End Sub
End Class
End Namespace
using Spire.Pdf;
using Spire.Pdf.Annotations;
namespace DeleteAttachment2
{
class Program
{
static void Main(string[] args)
{
//加载PDF文档
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("Attachment2.pdf");
//删除文档的所有注释附件
foreach (PdfPageBase page in pdf.Pages)
{
for (int i = 0; i < page.AnnotationsWidget.Count; i++)
{
PdfAnnotation annotation = page.AnnotationsWidget[i] as PdfAttachmentAnnotationWidget;
page.AnnotationsWidget.Remove(annotation);
}
}
//保存并打开文档
pdf.SaveToFile("Result.pdf");
System.Diagnostics.Process.Start("Result.pdf");
}
}
}
Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Namespace DeleteAttachment2
Class Program
Private Shared Sub Main(ByVal args As String())
Dim pdf As PdfDocument = New PdfDocument()
pdf.LoadFromFile("Attachment2.pdf")
For Each page As PdfPageBase In pdf.Pages
For i As Integer = 0 To page.AnnotationsWidget.Count - 1
Dim annotation As PdfAnnotation = TryCast(page.AnnotationsWidget(i), PdfAttachmentAnnotationWidget)
page.AnnotationsWidget.Remove(annotation)
Next
Next
pdf.SaveToFile("Result.pdf")
System.Diagnostics.Process.Start("Result.pdf")
End Sub
End Class
End Namespace
调试程序后，生成的文档就没有附件了。
以上全部内容为本次关于“C#/VB.NT操作PDF附件”的方法讲述。代码供参考，希望能给各位提供一定解决问题的思路。
( 如需转载本文，请注明出处。)
感谢阅读！
《本文完》
