C#如何将文件转换为内存流？

Question

就我而言，我正在研究将 PDF 转换为 BMP，然后将 BMP 转换为 PDF。

我确实包含输入和输出的文件。 顺便说一句，我想制作内存流而不是文件，但我想保留“a.pdf”和“a_bmp.pdf”。 我标记了（#）。我想在这部分（#）中将文件转换为内存流。这是我的代码。 您能告诉我如何将文件转换为内存流吗？

 Aspose.Pdf.Document pdfDocument = new Aspose.Pdf.Document("a.pdf");

 for (int pageCount = 1; pageCount <= pdfDocument.Pages.Count; pageCount++)
            {
                string f = String.Format("{0:D2}", pageCount);
                using (FileStream imageStream = new FileStream(#"a_" + f + "_out" + ".bmp", FileMode.Create))
                {                     
                    Resolution resolution = new Resolution(100);                                         
                    BmpDevice bmpDevice = new BmpDevice(resolution);                     
                    bmpDevice.Process(pdfDocument.Pages[pageCount], imageStream);                       
                    imageStream.Close();   
                }
                using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(#"a_" + f + "_out" + ".bmp"**))
                {
                    Aspose.Imaging.ImageOptions.BmpOptions Settings = new Aspose.Imaging.ImageOptions.BmpOptions();
                    Settings.BitsPerPixel = 24;

                    image.Save(#"a_" + f + "_out.bmp", Settings);
                }
            }

            Pdf pdf1 = new Pdf();

            foreach (string f in Directory.GetFiles(#"\\", "*_out.bmp"))
            {                   
                FileStream fs = new FileStream(f, FileMode.Open, FileAccess.Read);
                byte[] tmpBytes = new byte[fs.Length];
                fs.Read(tmpBytes, 0, Convert.ToInt32(fs.Length));

                MemoryStream mystream = new MemoryStream(tmpBytes);
                Bitmap b = new Bitmap(mystream);

                Aspose.Pdf.Generator.Section sec1 = new Aspose.Pdf.Generator.Section(pdf1);

                sec1.PageInfo.Margin.Top = 0;
                sec1.PageInfo.Margin.Bottom = 0;
                sec1.PageInfo.Margin.Left = 0;
                sec1.PageInfo.Margin.Right = 0;
                pdf1.Sections.Add(sec1);   

                Aspose.Pdf.Generator.Image image1 = new Aspose.Pdf.Generator.Image(sec1);              
                sec1.Paragraphs.Add(image1);
                image1.ImageInfo.ImageFileType = Aspose.Pdf.Generator.ImageFileType.Bmp;            
                image1.ImageInfo.ImageStream = mystream;
                image1.ImageScale = 1;
            }
            pdf1.Save("a_bmp.pdf");

Answer 1

请检查以下代码 sn-p 以便将图像文件导出到内存流对象并将相同的图像从流对象添加到另一个 PDF 中。

Aspose.Pdf.Document document = new Aspose.Pdf.Document(dataDir + @"input.pdf");

var resolution = new Aspose.Pdf.Devices.Resolution(100);
var bmpDevice = new Aspose.Pdf.Devices.BmpDevice(resolution);

// Export image file to stream
MemoryStream bmpStream = new MemoryStream();
bmpDevice.Process(document.Pages[1], bmpStream);


Document doc = new Document();
Page currpage = doc.Pages.Add();
Aspose.Pdf.Image img = new Aspose.Pdf.Image();
img.ImageStream = bmpStream;
img.ImageScale = 1;
currpage.PageInfo.Margin.Top = currpage.PageInfo.Margin.Bottom = currpage.PageInfo.Margin.Right = currpage.PageInfo.Margin.Left = 0;
currpage.Paragraphs.Add(img);

doc.Save(dataDir + "output.pdf");

此外，您会注意到我没有使用 Aspose.Pdf.Generator 方法来实现所需的功能，因为旧的 Aspose.Pdf.Generator 方法在新版本的 API 中已被弃用，强烈建议使用新的 Aspose.Pdf (DOM) 模型。

PS：我在 Aspose 担任支持开发人员。