Question

我有一个pdf（字节）存储在数据库表中，我还将图像（字节）存储在数据库表中。

现在我想从数据库中读取pdf文件并将图像（字节）插入到pdf文件中，并希望将新的pdf（字节）保存到新表中。它会给出错误＆＃34;文档没有页面。＆＃34; 我使用下面的代码：

 string fileName = "~/AuthDoc/" + Convert.ToString(consentMain.AppointmentId) +".pdf";                              
            string newFile = System.Web.Hosting.HostingEnvironment.MapPath(fileName);
            PdfReader reader = new PdfReader(consentDoc); // get pdf byte from datbase
            Rectangle size = reader.GetPageSizeWithRotation(1);
            Document document = new Document(size);
            // open the writer
            FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
            PdfWriter writer = PdfWriter.GetInstance(document, fs);
            document.Open();



            // PdfReader reader = new PdfReader(consentDoc);
          //   FileStream fs = new FileStream(newFile, FileMode.Create);
            var stamper = new PdfStamper(reader, fs);
            var pdfContentByte = stamper.GetOverContent(1);
            iTextSharp.text.Image PatientSign = iTextSharp.text.Image.GetInstance(consentMain.PatientSign); // image from database
            PatientSign.SetAbsolutePosition(100, 100);
            pdfContentByte.AddImage(PatientSign);

            document.Close();
            fs.Close();
            writer.Close();
            reader.Close();
            byte[] bytes = System.IO.File.ReadAllBytes(newFile);
            return bytes;

Answer 1

您的代码太多，缺少一条重要的代码。我拿了你的代码并删除了所有不必要的行（这会使你的文件损坏）：

string fileName = "~/AuthDoc/" + Convert.ToString(consentMain.AppointmentId) +".pdf";                              
string newFile = System.Web.Hosting.HostingEnvironment.MapPath(fileName);
PdfReader reader = new PdfReader(consentDoc); // get pdf byte from datbase
FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
var stamper = new PdfStamper(reader, fs);
var pdfContentByte = stamper.GetOverContent(1);
iTextSharp.text.Image PatientSign = iTextSharp.text.Image.GetInstance(consentMain.PatientSign); // image from database
PatientSign.SetAbsolutePosition(100, 100);
pdfContentByte.AddImage(PatientSign);
stamper.Close();
reader.Close();
byte[] bytes = System.IO.File.ReadAllBytes(newFile);
return bytes;

我还添加了缺失的行：stamper.Close();

如何使用ItextSharp将图像（字节）插入pdf（字节）

1 个答案: