c# - 使用 iTextSharp 将多个 TIFF 图像转换为 PDF

Question

我在 ASP.NET 和 iTextSharp PDF 库 中使用 WebSite。我有一个包含 3 页的 tiff 文档图像，我想将所有这 3 个 tiff 页转换为 1 个包含 3 页的 PDF 文件。

我试过了，但效果不佳......

请告诉我应该怎么做？

using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;

Document document = new Document();
using (var stream = new FileStream(@"C:\File\0.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
{
    PdfWriter.GetInstance(document, stream);
    document.Open();
    using (var imageStream = new FileStream(@"C:\File\0.tiff", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
    {
        var image = iTextSharp.text.Image.GetInstance(imageStream);
        document.Add(image);
    }
    document.Close();
}

Answer 1

// creation of the document with a certain size and certain margins
iTextSharp.text.Document document = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 0, 0, 0, 0);

// creation of the different writers
iTextSharp.text.pdf.PdfWriter writer = iTextSharp.text.pdf.PdfWriter.GetInstance(document, new System.IO.FileStream(Server.MapPath("~/App_Data/result.pdf"), System.IO.FileMode.Create));

// load the tiff image and count the total pages
System.Drawing.Bitmap bm = new System.Drawing.Bitmap(Server.MapPath("~/App_Data/source.tif"));
int total = bm.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page);

document.Open();
iTextSharp.text.pdf.PdfContentByte cb = writer.DirectContent;
for (int k = 0; k < total; ++k)
{
    bm.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, k);
    iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(bm, System.Drawing.Imaging.ImageFormat.Bmp);
    // scale the image to fit in the page
    img.ScalePercent(72f / img.DpiX * 100);
    img.SetAbsolutePosition(0, 0);
    cb.AddImage(img);
    document.NewPage();
}
document.Close();