Question

以下代码打开PDF文件，找到QR码所在的位置，然后旋转PDF文件，使QR码位于左上角。

代码读取和旋转很好，但它使用原始布局保存文件，我希望它保存旋转的文件。

for (int pg = 0; pg < inputDocument.PageCount; pg++)
{
    QRCodeDecoder decoder = new QRCodeDecoder();
    string workGif = workingFilename.Replace(".pdf", string.Format(".{0}.gif", pg + 1));
    GhostscriptWrapper.GeneratePageThumb(workingFilename, workGif, pg + 1, 300, 300); // size (last two params) does not seem to have any effect

    using (var fullImg = new Bitmap(workGif))
    {
        var bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, 375, 375), fullImg.PixelFormat);

        //AA THIS SECTION NEEDS TO BE CLEANED UP FOR ACTUAL USE
        Bitmap result = fullImg;
        //top-left
        var bandImg1 = result.Clone(new System.Drawing.Rectangle(0, 0, result.Width/2, result.Height/2), fullImg.PixelFormat);

        //top-right
        var bandImg2 = result.Clone(new System.Drawing.Rectangle(result.Width / 2, 0, result.Width / 2, result.Height / 2), fullImg.PixelFormat);

        //bottom-left
        var bandImg3 = result.Clone(new System.Drawing.Rectangle(0, result.Height / 2, result.Width / 2, result.Height / 2), fullImg.PixelFormat);

        //bottom-right
        var bandImg4 = result.Clone(new System.Drawing.Rectangle(result.Width / 2, result.Height / 2, result.Width / 2, result.Height / 2), fullImg.PixelFormat);

        Bitmap[] corners = new Bitmap[] { bandImg1, bandImg2, bandImg3, bandImg4 };
        string QRinfo = "";

        for (int i = 0; i < corners.Length; ++i)
        {
            string tempQRinfo = Process(corners[i]);
            if (tempQRinfo != null)
            {
                QRinfo = tempQRinfo;
                switch (i)
                {
                    case 0: break; //already upper left
                    case 1: fullImg.RotateFlip(RotateFlipType.Rotate270FlipNone); break;//upper right: rotate -90
                    case 2: fullImg.RotateFlip(RotateFlipType.Rotate90FlipNone);  break;//lower left: rotate 90
                    case 3: fullImg.RotateFlip(RotateFlipType.Rotate180FlipNone); break;//lower right: rotate 180
                }
                break;
            }
        }
        if (QRinfo == null)
        {
            Console.WriteLine("QRCode was not found");
        }
        else
        {
            MessageBox.Show(QRinfo);
            Console.WriteLine(QRinfo);
        }

        string[] qcode = QRinfo.Split('/');
        string gid = qcode[qcode.Count() - 1];
        Guid pgGuid = new Guid(gid);
        var ar = dc.Assessments.FirstOrDefault(c => c.ID == pgGuid);
        if (ar != null)
        {
            var p = inputDocument.Pages[pg];
            string opdName = FILESTORELOCATION + pgGuid.ToString() + ".pdf";
            PdfDocument opd = new PdfDocument(opdName);
            opd.Pages.Add(p);
            opd.Close();

            ar.StoragePath = opdName;
            ar.LastUploadedDT = DateTime.UtcNow;
            ar.UploadedByUserID = uploadingUser;
            dc.SubmitChanges();
        }
    }

    File.Delete(workGif);
}

Answer 1

使用PDFSharp，您可以完成此任务。这个例子向您展示了如何。

 var souce = // your rotated image here
 PdfDocument doc = new PdfDocument();
 doc.Pages.Add(new PdfPage());
 XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[0]);
 XImage img = XImage.FromFile(source);

 xgr.DrawImage(img, 0, 0);
 doc.Save(destinaton);
 doc.Close();

从here找到了这个。

Answer 2

您可以使用GroupDocs.Merger for .NET API旋转和保存页面。

string sourceFile ="source file";
Stream openFile = new FileStream(sourceFile, FileMode.Open);
DocumentResult result = new DocumentHandler().RotatePages(openFile, RotateMode.Rotate270);
Stream documentStream = result.Stream;
//output file
var fileStream = File.Create("output path" + "OutPut." + result.FileFormat);
documentStream.CopyTo(fileStream);
documentStream.Close();

轮换后保存pdf文件

2 个答案: