附件，指伴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。不才面的示例中介绍了如何分袂添加以上两种形式的PDF附件。别的，按照PDF附件的差别添加方法，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纵。
要点索引
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
工具使用
Spire.PDF for .NET 4.0
示例操纵
1.添加PDF附件
1.1 以普通文档形式添加附件
C
using Spire.Pdf;
using Spire.Pdf.Attachments;
namespace AddAttachment_PDF
{
class Program
{
static void Main(string[] args)
{
//创建一个PdfDocument类东西，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文档的附件调集中
pdf.Attachments.Add(attachment);
//生存并打开文档
pdf.SaveToFile("Attachment1.pdf");
System.Diagnostics.Process.Start("Attachment1.pdf");
}
}
}
测试功效：
VB.NET
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
1.2 以文档注释形式添加附件
Csharp
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类东西，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，并设置文本格局（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、巨细、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);
//生存并打开文档
doc.SaveToFile("Attachment2.pdf");
System.Diagnostics.Process.Start("Attachment2.pdf");
}
}
}
测试功效：
VB.NET
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
2.获取PDF附件
2.1 获取文件附件
Csharp
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();
}
}
}
