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本文将展示如何使用Aspose.Words将一个图像转换为PDF。虽然图像转换PDF并不是Aspose.Words的主要特点,但是这个例子展示了使用Aspose.Words完成这项任务的简易程度。

下面的代码允许转换单帧图像,比如JPEG、PNG、BMP,EMF或WMF,以及多帧TIF图像和GIF，并将它们转换为PDF。

C#

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Reflection;

using Aspose.Words;
using Aspose.Words.Drawing;

namespace ImageToPdf
{
    class Program
    {
        public static void Main(string[] args)
        {
            // Sample infrastructure.
            string exeDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + Path.DirectorySeparatorChar;
            string dataDir = new Uri(new Uri(exeDir), @"../../Data/").LocalPath;

            ConvertImageToPdf(dataDir + "Test.jpg", dataDir + "TestJpg Out.pdf");
            ConvertImageToPdf(dataDir + "Test.png", dataDir + "TestPng Out.pdf");
            ConvertImageToPdf(dataDir + "Test.wmf", dataDir + "TestWmf Out.pdf");
            ConvertImageToPdf(dataDir + "Test.tiff", dataDir + "TestTiff Out.pdf");
            ConvertImageToPdf(dataDir + "Test.gif", dataDir + "TestGif Out.pdf");
        }

        /// <summary>
        /// Converts an image to PDF using Aspose.Words for .NET.
        /// </summary>
        /// <param name="inputFileName">File name of input image file.</param>
        /// <param name="outputFileName">Output PDF file name.</param>
        public static void ConvertImageToPdf(string inputFileName, string outputFileName)
        {
            // Create Aspose.Words.Document and DocumentBuilder.
            // The builder makes it simple to add content to the document.
            Document doc = new Document();
            DocumentBuilder builder = new DocumentBuilder(doc);

            // Read the image from file, ensure it is disposed.
            using (Image image = Image.FromFile(inputFileName))
            {
                // Find which dimension the frames in this image represent. For example 
                // the frames of a BMP or TIFF are "page dimension" whereas frames of a GIF image are "time dimension". 
                FrameDimension dimension = new FrameDimension(image.FrameDimensionsList[0]); 

                 // Get the number of frames in the image.
                int framesCount = image.GetFrameCount(dimension);

                // Get the number of frames in the image.
                int framesCount = image.GetFrameCount(FrameDimension.Page);

                // Loop through all frames.
                for (int frameIdx = 0; frameIdx < framesCount; frameIdx++)
                {
                    // Insert a section break before each new page, in case of a multi-frame TIFF.
                    if (frameIdx != 0)
                        builder.InsertBreak(BreakType.SectionBreakNewPage);

                    // Select active frame.
                    image.SelectActiveFrame(dimension, frameIdx);

                    // We want the size of the page to be the same as the size of the image.
                    // Convert pixels to points to size the page to the actual image size.
                    PageSetup ps = builder.PageSetup;
                    ps.PageWidth = ConvertUtil.PixelToPoint(image.Width, image.HorizontalResolution);
                    ps.PageHeight = ConvertUtil.PixelToPoint(image.Height, image.VerticalResolution);

                    // Insert the image into the document and position it at the top left corner of the page.
                    builder.InsertImage(
                        image,
                        RelativeHorizontalPosition.Page,
                        0,
                        RelativeVerticalPosition.Page,
                        0,
                        ps.PageWidth,
                        ps.PageHeight,
                        WrapType.None);
                }
            }

            // Save the document to PDF.
            doc.Save(outputFileName);
        }
    }
}
 

Visual Basic

Imports Microsoft.VisualBasic
Imports System
Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.IO
Imports System.Reflection

Imports Aspose.Words
Imports Aspose.Words.Drawing

Namespace ImageToPdf
    Friend Class Program
        Public Shared Sub Main(ByVal args() As String)
            ' Sample infrastructure.
            Dim exeDir As String = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + Path.DirectorySeparatorChar
            Dim dataDir As String = New Uri(New Uri(exeDir), "../../Data/").LocalPath

            ConvertImageToPdf(dataDir & "Test.jpg", dataDir & "TestJpg Out.pdf")
            ConvertImageToPdf(dataDir & "Test.png", dataDir & "TestPng Out.pdf")
            ConvertImageToPdf(dataDir & "Test.wmf", dataDir & "TestWmf Out.pdf")
            ConvertImageToPdf(dataDir & "Test.tiff", dataDir & "TestTiff Out.pdf")
            ConvertImageToPdf(dataDir & "Test.gif", dataDir & "TestGif Out.pdf")
        End Sub

        ''' <summary>
        ''' Converts an image to PDF using Aspose.Words for .NET.
        ''' </summary>
        ''' <param name="inputFileName">File name of input image file.</param>
        ''' <param name="outputFileName">Output PDF file name.</param>
        Public Shared Sub ConvertImageToPdf(ByVal inputFileName As String, ByVal outputFileName As String)
            ' Create Aspose.Words.Document and DocumentBuilder.
            ' The builder makes it simple to add content to the document.
            Dim doc As New Document()
            Dim builder As New DocumentBuilder(doc)

            ' Read the image from file, ensure it is disposed.
            Using image As Image = Image.FromFile(inputFileName)
                ' Find which dimension the frames in this image represent. For example 
		' the frames of a BMP or TIFF are "page dimension" whereas frames of a GIF image are "time dimension". 
		Dim dimension As New FrameDimension(image.FrameDimensionsList(0))

                ' Get the number of frames in the image.
                Dim framesCount As Integer = image.GetFrameCount(dimension)

                ' Loop through all frames.
                For frameIdx As Integer = 0 To framesCount - 1
                    ' Insert a section break before each new page, in case of a multi-frame TIFF.
                    If frameIdx <> 0 Then
                        builder.InsertBreak(BreakType.SectionBreakNewPage)
                    End If

                    ' Select active frame.
                    image.SelectActiveFrame(dimension, frameIdx)

                    ' We want the size of the page to be the same as the size of the image.
                    ' Convert pixels to points to size the page to the actual image size.
                    Dim ps As PageSetup = builder.PageSetup
                    ps.PageWidth = ConvertUtil.PixelToPoint(image.Width, image.HorizontalResolution)
                    ps.PageHeight = ConvertUtil.PixelToPoint(image.Height, image.VerticalResolution)

                    ' Insert the image into the document and position it at the top left corner of the page.
                    builder.InsertImage(image, RelativeHorizontalPosition.Page, 0, RelativeVerticalPosition.Page, 0, ps.PageWidth, ps.PageHeight, WrapType.None)
                Next frameIdx
            End Using

            ' Save the document to PDF.
            doc.Save(outputFileName)
        End Sub
    End Class
End Namespace