CSharp中文档转换为PDF或图片不依赖WPS或Office

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CSharp中文档转换为PDF或图片不依赖WPS或Office

安装依赖

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Install-Package Aspose.Words -Version 19.10.0
Install-Package Aspose.Cells -Version 19.10.0
Install-Package Aspose.Slides.NET -Version 19.10.0
Install-Package Aspose.PDF -Version 19.10.0

添加系统引用

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System.Drawing

Word => PDF/IMG

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using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using Aspose.Words;
using Path = System.IO.Path;

namespace document_converter.Utils
{
    public class ConverterWord
    {
        public static void ToPdf(
            string sourcePath,
            string targetPath
        )
        {
            SetLicense();
            Document doc = new Document(sourcePath);
            doc.Save(targetPath, SaveFormat.Pdf);
        }

        /// <summary>
        /// 转换为图片
        /// </summary>
        /// <param name="sourcePath">原路径</param>
        /// <param name="targetPath">目标文件夹</param>
        /// <param name="startPageNum">开始页面</param>
        /// <param name="endPageNum">结束页面</param>
        /// <param name="imageFormat">格式</param>
        /// <param name="resolution">清晰度</param>
        /// <returns></returns>
        public static List<string> ToImage(
            string sourcePath,
            string targetPath,
            int startPageNum = 1,
            int endPageNum = int.MaxValue,
            ImageFormat imageFormat = null,
            int resolution = 128
        )
        {
            SetLicense();
            string pdfPath = Path.ChangeExtension(sourcePath, "temp");
            ToPdf(sourcePath, pdfPath);
            var imgList = ConverterPdf.ToImage(pdfPath, targetPath, startPageNum, endPageNum, imageFormat, resolution);
            if (File.Exists(pdfPath))
            {
                File.Delete(pdfPath);
            }

            return imgList;
        }


        private static void SetLicense()
        {
            new License()
                .SetLicense(new MemoryStream(Convert.FromBase64String(ConvertLicense.LicenseCode)));
        }
    }
}

也可以只用Aspose.Words来保存为图片

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/// <summary>
/// 转换为图片的方法
/// 你可以像这样调用该方法： ToImage("F:\\PdfFile.doc", "F:\\ImageFile", 1, 20, ImageFormat.Png, 256);
/// </summary>
/// <param name="sourcePath"></param>
/// <param name="targetPath">
/// 图片输出路径，如果为空，默认值为Word所在路径
/// </param>
/// <param name="startPageNum">
/// 从PDF文档的第几页开始转换，如果为0，默认值为1
/// </param>
/// <param name="endPageNum">
/// 从PDF文档的第几页开始停止转换，如果为0，默认值为Word总页数
/// </param>
/// <param name="imageFormat">
/// 设置所需图片格式，如果为null，默认格式为JPEG
/// </param>
/// <param name="resolution">
/// 设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024
/// </param>
public static List<string> ToImage2(
    string sourcePath,
    string targetPath,
    int startPageNum = 1,
    int endPageNum = int.MaxValue,
    ImageFormat imageFormat = null,
    float resolution = 256
)
{
    SetLicense();
    string imageName = Path.GetFileNameWithoutExtension(sourcePath).Replace(" ", "");

    // 返回的图片绝对路径集合
    List<string> images = new List<string>();
    try
    {
        // open word file
        Document doc = new Document(sourcePath);

        if (targetPath.Trim().Length == 0)
        {
            targetPath = Path.GetDirectoryName(sourcePath);
        }

        if (!Directory.Exists(targetPath))
        {
            if (targetPath != null)
            {
                Directory.CreateDirectory(targetPath);
            }
        }


        if (startPageNum <= 0)
        {
            startPageNum = 1;
        }

        if (endPageNum > doc.PageCount || endPageNum <= 0)
        {
            endPageNum = doc.PageCount;
        }

        if (startPageNum > endPageNum)
        {
            startPageNum = endPageNum;
            endPageNum = startPageNum;
        }

        if (imageFormat == null)
        {
            imageFormat = ImageFormat.Jpeg;
        }

        if (resolution <= 0)
        {
            resolution = 128;
        }

        ImageSaveOptions imageSaveOptions = new ImageSaveOptions(GetSaveFormat(imageFormat))
        {
            Resolution = resolution
        };

        // start to convert each page
        for (int i = startPageNum; i <= endPageNum; i++)
        {
            imageSaveOptions.PageIndex = i - 1;
            if (targetPath != null)

            {
                string pathAll = Path.Combine(
                    targetPath,
                    imageName + "_" + i + "." + imageFormat.ToString().ToLower()
                );
                doc.Save(
                    pathAll,
                    imageSaveOptions
                );
                images.Add(pathAll);
            }
        }
    }
    catch (Exception ex)
    {
        throw new Exception(
            "The document appears to be corrupted and cannot be loaded.".Equals(ex.Message)
            ? "文件似乎已损坏，无法加载。"
            : "文件被占用请关闭后重新导入"
        );
    }

    return images;
}

private static SaveFormat GetSaveFormat(ImageFormat imageFormat)
{
    SaveFormat sf;
    if (imageFormat.Equals(ImageFormat.Png))
    {
        sf = SaveFormat.Png;
    }
    else if (imageFormat.Equals(ImageFormat.Jpeg))
    {
        sf = SaveFormat.Jpeg;
    }
    else if (imageFormat.Equals(ImageFormat.Tiff))
    {
        sf = SaveFormat.Tiff;
    }
    else if (imageFormat.Equals(ImageFormat.Bmp))
    {
        sf = SaveFormat.Bmp;
    }
    else
    {
        sf = SaveFormat.Unknown;
    }

    return sf;
}

Excel => PDF/IMG

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using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using Aspose.Cells;

namespace document_converter.Utils
{
    public class ConverterExcel
    {
        /// <summary>
        /// 转换为PDF
        /// </summary>
        /// <param name="sourcePath">原路径</param>
        /// <param name="targetPath">目标路径</param>
        public static void ToPdf(
            string sourcePath,
            string targetPath
        )
        {
            SetLicense();
            // 创建 Workbook 对象并加载 Excel 文件
            using (Workbook workbook = new Workbook(sourcePath))
            {
                // 创建 PDF 保存选项
                PdfSaveOptions options = new PdfSaveOptions();

                // 将 Workbook 保存为 PDF 文件
                workbook.Save(targetPath, options);
            }
        }


        /// <summary>
        /// 转换为图片
        /// </summary>
        /// <param name="sourcePath">原路径</param>
        /// <param name="targetPath">目标文件夹</param>
        /// <param name="startPageNum">开始页面</param>
        /// <param name="endPageNum">结束页面</param>
        /// <param name="imageFormat">格式</param>
        /// <param name="resolution">清晰度</param>
        /// <returns></returns>
        public static List<string> ToImage(
            string sourcePath,
            string targetPath,
            int startPageNum = 1,
            int endPageNum = int.MaxValue,
            ImageFormat imageFormat = null,
            int resolution = 128
        )
        {
            SetLicense();
            string pdfPath = Path.ChangeExtension(sourcePath, "temp");
            ToPdf(sourcePath, pdfPath);
            var imgList = ConverterPdf.ToImage(pdfPath, targetPath, startPageNum, endPageNum, imageFormat, resolution);
            if (File.Exists(pdfPath))
            {
                File.Delete(pdfPath);
            }

            return imgList;
        }

        private static void SetLicense()
        {
            new License()
                .SetLicense(
                    new MemoryStream(
                        Convert.FromBase64String(ConvertLicense.LicenseCode)
                    )
                );
        }
    }
}

PPT => PDF/IMG

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using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using Aspose.Slides;


namespace document_converter.Utils
{
    public class ConverterPpt
    {
        /// <summary>
        /// 转换为PDF
        /// </summary>
        /// <param name="sourcePath">原路径</param>
        /// <param name="targetPath">目标路径</param>
        public static void ToPdf(
            string sourcePath,
            string targetPath
        )
        {
            SetLicense();
            using (var presentation = new Presentation(sourcePath))
            {
                // 保存为PDF文件
                presentation.Save(targetPath, Aspose.Slides.Export.SaveFormat.Pdf);
            }
        }

        /// <summary>
        /// 转换为图片
        /// </summary>
        /// <param name="sourcePath">原路径</param>
        /// <param name="targetPath">目标文件夹</param>
        /// <param name="startPageNum">开始页面</param>
        /// <param name="endPageNum">结束页面</param>
        /// <param name="imageFormat">格式</param>
        /// <param name="resolution">清晰度</param>
        /// <returns></returns>
        public static List<string> ToImage(
            string sourcePath,
            string targetPath,
            int startPageNum = 1,
            int endPageNum = int.MaxValue,
            ImageFormat imageFormat = null,
            int resolution = 128
        )
        {
            SetLicense();
            string pdfPath = Path.ChangeExtension(sourcePath, "temp");
            ToPdf(sourcePath, pdfPath);
            var imgList = ConverterPdf.ToImage(pdfPath, targetPath, startPageNum, endPageNum, imageFormat, resolution);
            if (File.Exists(pdfPath))
            {
                File.Delete(pdfPath);
            }

            return imgList;
        }

        private static void SetLicense()
        {
            new License()
                .SetLicense(
                    new MemoryStream(
                        Convert.FromBase64String(ConvertLicense.LicenseCode)
                    )
                );
        }
    }
}

PDF => IMG

使用Aspose.PDF

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using Aspose.Pdf;
using Aspose.Pdf.Devices;


namespace document_converter.Utils
{
    public class ConverterPdf
    {
        /// <summary>
        /// 转换为图片的方法
        /// 你可以像这样调用该方法： ToImage("D:\\PdfFile.pdf", "D:\\ImageFile", 1, 20, ImageFormat.Png, 256);
        /// </summary>
        /// <param name="sourcePath"></param>
        /// <param name="targetPath">
        /// 图片输出路径，如果为空，默认值为Word所在路径
        /// </param>
        /// <param name="startPageNum">
        /// 从PDF文档的第几页开始转换，如果为0，默认值为1
        /// </param>
        /// <param name="endPageNum">
        /// 从PDF文档的第几页开始停止转换，如果为0，默认值为Word总页数
        /// </param>
        /// <param name="imageFormat">
        /// 设置所需图片格式，如果为null，默认格式为JPEG
        /// </param>
        /// <param name="resolution">
        /// 设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024
        /// </param>
        public static List<string> ToImage(
            string sourcePath,
            string targetPath,
            int startPageNum = 1,
            int endPageNum = int.MaxValue,
            ImageFormat imageFormat = null,
            int resolution = 128
        )
        {
            SetLicense();
            string imageName = Path.GetFileNameWithoutExtension(sourcePath).Replace(" ", "");
            // 返回的图片绝对路径集合
            List<string> images = new List<string>();
            try
            {
                if (!Directory.Exists(targetPath))
                {
                    if (targetPath != null)
                    {
                        Directory.CreateDirectory(targetPath);
                    }
                }

                using (var pdfDocument = new Document(sourcePath))
                {
                    if (startPageNum <= 0)
                    {
                        startPageNum = 1;
                    }

                    if (endPageNum > pdfDocument.Pages.Count || endPageNum <= 0)
                    {
                        endPageNum = pdfDocument.Pages.Count;
                    }

                    if (startPageNum > endPageNum)
                    {
                        startPageNum = endPageNum;
                        endPageNum = startPageNum;
                    }

                    if (imageFormat == null)
                    {
                        imageFormat = ImageFormat.Jpeg;
                    }

                    if (resolution <= 0)
                    {
                        resolution = 128;
                    }

                    for (int i = startPageNum; i <= endPageNum; i++)
                    {
                        using (var imageStream = new MemoryStream())
                        {
                            var jpegDevice = new JpegDevice(new Resolution(resolution), 100);
                            jpegDevice.Process(pdfDocument.Pages[i], imageStream);

                            imageStream.Position = 0;

                            using (var image = new Bitmap(imageStream))
                            {
                                if (targetPath == null) continue;
                                string pathAll = Path.Combine(
                                    targetPath,
                                    imageName + "_" + i + "." + imageFormat.ToString().ToLower()
                                );
                                images.Add(pathAll);
                                image.Save(pathAll, imageFormat);
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

            return images;
        }

        private static void SetLicense()
        {
            new License()
                .SetLicense(
                    new MemoryStream(
                        Convert.FromBase64String(ConvertLicense.LicenseCode)
                    )
                );
        }
    }
}

使用O2S.Components.PDFRender4NET

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using O2S.Components.PDFRender4NET;

namespace document_converter.Utils
{
    public class ConverterPdf
    {
        public enum Definition
        {
            Low = 2,
            Standard = 3,
            High = 5,
            SuperHigh = 8,
            UltraHigh = 10
        }

        /// <summary>
        /// 获取PDF的页数
        /// </summary>
        /// <param name="pdfInputPath"></param>
        /// <returns></returns>
        public static int GetPageNum(string pdfInputPath)
        {
            PDFFile pdfFile = PDFFile.Open(pdfInputPath);
            return pdfFile.PageCount;
        }

        /// <summary>
        /// 将PDF文档转换为图片的方法
        /// </summary>
        /// <param name="pdfInputPath">PDF文件路径</param>
        /// <param name="imageOutputPath">图片输出路径</param>
        /// <param name="startPageNum">从PDF文档的第几页开始转换</param>
        /// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
        /// <param name="imageFormat">设置所需图片格式</param>
        /// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
        public static List<string> ToImage(
            string pdfInputPath,
            string imageOutputPath,
            int startPageNum = 1,
            int endPageNum = int.MaxValue,
            ImageFormat imageFormat = null,
            Definition definition = Definition.Standard
        )
        {
            Console.WriteLine($@"Converting: [{pdfInputPath}] -> [{imageOutputPath}]");
            List<string> imgList = new List<string>();
            string imageName = "pdfimg";
            if (imageFormat == null)
            {
                imageFormat = ImageFormat.Jpeg;
            }

            PDFFile pdfFile = PDFFile.Open(pdfInputPath);
            if (!Directory.Exists(imageOutputPath))
            {
                Directory.CreateDirectory(imageOutputPath);
            }

            if (startPageNum <= 0)
            {
                startPageNum = 1;
            }

            if (endPageNum > pdfFile.PageCount)
            {
                endPageNum = pdfFile.PageCount;
            }

            if (startPageNum > endPageNum)
            {
                startPageNum = endPageNum;
                endPageNum = startPageNum;
            }

            for (int i = startPageNum; i <= endPageNum; i++)
            {
                Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition);

                string filePath = imageOutputPath + imageName + i + "." + imageFormat.ToString().ToLower();
                imgList.Add(filePath);
                pageImage.Save(filePath, imageFormat);
                pageImage.Dispose();
            }

            pdfFile.Dispose();
            return imgList;
        }
    }
}

其中DLL下载

链接：https://pan.baidu.com/s/19a8hC20b24l1mSynSw1blA
提取码：psvm

授权

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namespace document_converter.Utils
{
    public class ConvertLicense
    {
        public static string LicenseCode =
            "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";
    }
}

注意

要分别为每个 Aspose 产品设置 License。即使所有组件公用一个许可证文件，例如Aspose.Total.lic，您仍然需要为应用程序中使用的每个 Aspose 产品单独调用SetLicense 。

调用

完整代码

https://gitee.com/psvmc/document-converter.git

返回码

  • 0 转换成功
  • 1 转换失败
  • 2 格式不支持
  • 3 文件不存在

转为PDF

Word => PDF

1
2
document-converter.exe pdf "D:\\Tools\\Docs\\01.docx" "D:\\Tools\\Docs\\pdf\\01.pdf"
document-converter.exe pdf "D:\\Tools\\Docs\\01.doc" "D:\\Tools\\Docs\\pdf\\01.pdf"

PPT => PDF

1
document-converter.exe pdf "D:\\Tools\\Docs\\02.pptx" "D:\\Tools\\Docs\\pdf\\02.pdf"

缺少字体文档测试

1
document-converter.exe pdf "D:\\Tools\\Docs\\more\\第一节　导数的概念及运算　定积分.ppt" "D:\\Tools\\Docs\\pdf\\第一节　导数的概念及运算　定积分.pdf"

Excel => PDF

1
document-converter.exe pdf "D:\\Tools\\Docs\\03.xlsx" "D:\\Tools\\Docs\\pdf\\03.pdf"

TXT => PDF

1
document-converter.exe pdf "D:\\Tools\\Docs\\04.txt" "D:\\Tools\\Docs\\pdf\\04.pdf"

XML => PDF

1
document-converter.exe pdf "D:\\Tools\\Docs\\05.xml" "D:\\Tools\\Docs\\pdf\\05.pdf"

HTML => PDF

1
document-converter.exe pdf "D:\\Tools\\Docs\\06.html" "D:\\Tools\\Docs\\pdf\\06.pdf"

转为图片

PDF => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\pdf\\01.pdf" "D:\\Tools\\Docs\\images\\pdf\\"

Word => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\01.docx" "D:\\Tools\\Docs\\images\\word\\"

PPT => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\02.pptx" "D:\\Tools\\Docs\\images\\ppt\\"

Excel => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\03.xlsx" "D:\\Tools\\Docs\\images\\excel\\"

TXT => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\04.txt" "D:\\Tools\\Docs\\images\\txt\\"

XML => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\05.xml" "D:\\Tools\\Docs\\images\\xml\\"

HTML => IMG

1
document-converter.exe img "D:\\Tools\\Docs\\06.html" "D:\\Tools\\Docs\\images\\html\\"

Aspose.PDF和O2S.Components.PDFRender4NET

Aspose.PDF是一个用于处理PDF文件的强大工具，它提供了一系列的功能，包括：

  1. 创建和编辑PDF文件：可以使用Aspose.PDF创建新的PDF文档、编辑和修改现有的PDF文档。

  2. 将PDF文件转换为其他格式：将PDF文件转换为多种文件格式，包括DOC、DOCX、HTML、XML、PPT和XPS等。

  3. 添加水印和加密：可以在PDF文档中添加水印、数字签名和加密等安全特性。

  4. 表单处理：用于创建、填写和提交PDF表单。

  5. 文本和图像处理：可以从PDF文档中提取文本和图像，还可以在文档中插入、更新和删除文本和图像等。

  6. 页面元素处理：可以在PDF页面上添加、更新、删除和移动页面元素，如链接、书签、注释、标签和旋转等。

总之，Aspose.PDF提供了广泛的功能，能够满足用户处理PDF文件的各种需求。

Aspose.PDF功能比较多所以文件比较大，有32.9M。

O2S.Components.PDFRender4NET在转图片上效果也不错，大小只有944K，还不到1M，推荐使用。

在网上看的

O2S.Components.PDFRender4NET依赖Ghostscript软件来渲染PDF文件。

但是实际测试的时候并不用安装Ghostscript，也能转换成功。