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Spire.Doc 是一款专门对 Word 文档进行操作的  类库。在于帮助开发人员无需安装 Microsoft Word情况下，轻松快捷高效地创建、编辑、转换和打印 Microsoft Word 文档。拥有近10年专业开发经验Spire系列办公文档开发工具，专注于创建、编辑、转换和打印Word/PDF/Excel等格式文件处理，小巧便捷。 

E-iceblue 功能类库Spire 系列文档处理组件均由中国本土团队研发，不依赖第三方软件，不受其他国家的技术或法律法规限制，同时适配国产操作系统如中科方德、中标麒麟等，兼容国产文档处理软件 WPS（如 .wps/.et/.dps 等格式

Spire.PDF for.net下载   Spire.PDF for java下载

行号用于在每行文本旁边显示 Word 自动计算的行数。当我们需要参考合同或法律文件等文档中的特定行时，它非常有用。word中的行号功能允许我们设置起始值、编号间隔、与文本的距离以及行号的编号方式。使用 Spire.Doc，我们可以实现上述所有功能。本文将介绍如何将 XPS 转为PDF 格式。

Tiff图像作为一种图形容器，既可以存储光栅图像，也可以存储矢量图像；可以包含高质量的图形，支持从1位到24位的色深；支持有损和无损压缩；还支持多层和多页。若想将文档转换为高质量的图形，并且在压缩过程中保存时不会丢失图像文件信息，tiff图像是您的最佳选择。

本文介绍了通过document.SaveAsImage()和JoinTiffImages()方法将PDF文档保存为tiff图像的详细方法。Spire.PDF for .NET是一个PDF组件，它包含了在.NET、Silverlight和WPF平台上创建、阅读、编辑和处理PDF文档的丰富功能。下面的截图展示了将PDF文档保存为tiff图像后的结果：

该方法的主要步骤如下
步骤1：创建一个新的pdf文档并加载它。

PdfDocument document = new PdfDocument();
document.LoadFromFile(@"sample.pdf");

步骤2：使用document.SaveAsImage()方法将pdf文档保存为图像数组。

private static Image[] SaveAsImage(PdfDocument document)
{
Image[] images = new Image[document.Pages.Count];
for (int i = 0; i < document.Pages.Count; i++)
{
//use the document.SaveAsImage() method save the pdf as image
images[i] = document.SaveAsImage(i);
}
return images;
}

步骤3：使用JoinTiffImages()方法将pdf页面中的图像保存为tiff图像类型，并指定编码器和图像编码器参数。

public static void JoinTiffImages(Image[] images, string outFile, EncoderValue compressEncoder)
{
 //use the save encoder
Encoder enc = Encoder.SaveFlag;
EncoderParameters ep = new EncoderParameters(2);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)compressEncoder);
Image pages = images[0];
int frame = 0;
ImageCodecInfo info = GetEncoderInfo("image/tiff");
foreach (Image img in images)
{
if (frame == 0)
{
pages = img;
//save the first frame
pages.Save(outFile, info, ep);
}
else
{
//save the intermediate frames
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);
pages.SaveAdd(img, ep);
}
if (frame == images.Length - 1)
{
//flush and close.
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
pages.SaveAdd(ep);
}
frame++;
}
}

下载并安装Spire.Pdf for .NET，使用下面的代码体验将pdf文档保存为tiff图片的方法。

完整代码：

[C#]

using System;
using System.Drawing;
using System.Drawing.Imaging;
using Spire.Pdf;
namespace SavePdfAsTiff
{
class Program
{
static void Main(string[] args)
{
PdfDocument document = new PdfDocument();
document.LoadFromFile(@"01.pdf");
JoinTiffImages(SaveAsImage(document),"result.tiff",EncoderValue.CompressionLZW);
System.Diagnostics.Process.Start("result.tiff");
}
private static Image[] SaveAsImage(PdfDocument document)
{
Image[] images = new Image[document.Pages.Count];
for (int i = 0; i < document.Pages.Count; i++)
{
images[i] = document.SaveAsImage(i);
}
return images;
}

private static ImageCodecInfo GetEncoderInfo(string mimeType)
{
ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
for (int j = 0; j < encoders.Length; j++)
{
if (encoders[j].MimeType == mimeType)
return encoders[j];
}
throw new Exception(mimeType + " mime type not found in ImageCodecInfo");
}

public static void JoinTiffImages(Image[] images, string outFile, EncoderValue compressEncoder)
{
//use the save encoder
Encoder enc = Encoder.SaveFlag;
EncoderParameters ep = new EncoderParameters(2);
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)compressEncoder);
Image pages = images[0];
int frame = 0;
ImageCodecInfo info = GetEncoderInfo("image/tiff");
foreach (Image img in images)
{
if (frame == 0)
{
pages = img;
//save the first frame
pages.Save(outFile, info, ep);
}

else
{
//save the intermediate frames
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);

pages.SaveAdd(img, ep);
}
if (frame == images.Length - 1)
{
//flush and close.
ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
pages.SaveAdd(ep);
}
frame++;
}
}
}
}

[VB.NET]

Imports System
Imports System.Drawing
Imports System.Drawing.Imaging
Imports Spire.Pdf
Namespace SavePdfAsTiff
Class Program
Sub Main()
Dim document As PdfDocument = New PdfDocument()
document.LoadFromFile("01.pdf")
JoinTiffImages(SaveAsImage(document), "result.tiff", EncoderValue.CompressionLZW)
System.Diagnostics.Process.Start("result.tiff")
End Sub
Private Shared Function SaveAsImage(ByVal document As PdfDocument)
Dim images() As Image = New Image(document.Pages.Count-1) {}
Dim i As Integer
For i = 0 To document.Pages.Count - 1 Step i + 1
images(i) = document.SaveAsImage(i)
Next
Return images
End Function
Private Shared Function GetEncoderInfo(ByVal mimeType As String) As ImageCodecInfo
Dim encoders() As ImageCodecInfo = ImageCodecInfo.GetImageEncoders()
Dim j As Integer
For j = 0 To encoders.Length - 1 Step j + 1
If encoders(j).MimeType = mimeType Then
Return encoders(j)
End If
Next
Throw New Exception(mimeType + " mime type not found in ImageCodecInfo")
End Function
Public Shared Sub JoinTiffImages(ByVal images() As Image, ByVal outFile As String, ByVal compressEncoder As EncoderValue)
use the save encoder
Dim enc As Encoder = Encoder.SaveFlag
Dim ep As EncoderParameters = New EncoderParameters(2)
ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.MultiFrame, Long))
ep.Param(1) = New EncoderParameter(Encoder.Compression, CType(compressEncoder, Long))
Dim pages As Image = images(0)
Dim frame As Integer = 0
Dim info As ImageCodecInfo = GetEncoderInfo("image/tiff")
Dim img As Image
For Each img In images
If frame = 0 Then
pages = img
'save the first frame
pages.Save(outFile, info, ep)
Else
'save the intermediate frames
ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.FrameDimensionPage, Long))
pages.SaveAdd(img, ep)
End If

If frame = images.Length - 1 Then
'flush and close.
ep.Param(0) = New EncoderParameter(enc, CType(EncoderValue.Flush, Long))
pages.SaveAdd(ep)
End If
frame = frame + 1
Next
End Sub
End Class
End Namespace

以上便是如何将HTML 字符串转换为 PDF，如果您有其他问题也可以继续浏览本系列文章，获取相关教程，你还可以给我留言或者加入我们的官方技术交流群。

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