iText7在内存中创建PDF而不是物理文件
本文关键字:文件 PDF 内存 创建 iText7 | 更新日期: 2023-09-27 18:17:18
如何在内存流中创建PDF而不是使用itext7的物理文件?我不知道在最新的版本中怎么做,有什么帮助吗?
我尝试了以下代码,但是pdfSM没有正确填充:
string filePath = "./abc.pdf";
MemoryStream pdfSM = new ByteArrayOutputStream();
PdfDocument doc = new PdfDocument(new PdfReader(filePath), new PdfWriter(pdfSM));
.......
doc.close();
完整的测试代码如下供您参考,它在将filePath传递到PdfWriter时工作,但不适用于内存流:
public static readonly String sourceFolder = "../../FormTest/";
public static readonly String destinationFolder = "../../Output/";
static void Main(string[] args)
{
String srcFilePattern = "I-983";
String destPattern = "I-129_2014_";
String src = sourceFolder + srcFilePattern + ".pdf";
String dest = destinationFolder + destPattern + "_flattened.pdf";
MemoryStream returnSM = new MemoryStream();
PdfDocument doc = new PdfDocument(new PdfReader(src), new PdfWriter(returnSM));
PdfAcroForm form = PdfAcroForm.GetAcroForm(doc, false);
foreach (PdfFormField field in form.GetFormFields().Values)
{
var fieldName = field.GetFieldName();
var type = field.GetType();
if (fieldName != null)
{
if (type.Name.Equals("PdfTextFormField"))
{
field.SetValue("T");
}
}
}
form.FlattenFields();
doc.Close();
}
这对我很有用。
public byte[] CreatePdf()
{
var stream = new MemoryStream();
var writer = new PdfWriter(stream);
var pdf = new PdfDocument(writer);
var document = new Document(pdf);
document.Add(new Paragraph("Hello world!"));
document.Close();
return stream.ToArray();
}
我需要同样的东西。让它像这样工作:(我包含了一些提高性能的设置)
string HtmlString = "<html><head></head><body>some content</body></html>";
byte[] buffer;
PdfDocument pdfDoc = null;
using (MemoryStream memStream = new MemoryStream())
{
using(PdfWriter pdfWriter = new PdfWriter(memStream, wp))
{
pdfWriter.SetCloseStream(true);
using (pdfDoc = new PdfDocument(pdfWriter))
{
ConverterProperties props = new ConverterProperties();
pdfDoc.SetDefaultPageSize(PageSize.LETTER);
pdfDoc.SetCloseWriter(true);
pdfDoc.SetCloseReader(true);
pdfDoc.SetFlushUnusedObjects(true);
HtmlConverter.ConvertToPdf(HtmlString, pdfDoc, props));
pdfDoc.Close();
}
}
buffer = memStream.ToArray();
}
return buffer;
iText7, c# Controller
错误:public ActionResult Report()
{
//...
doc1.Close();
return File(memoryStream1, "application/pdf", "pdf_file_name.pdf");
}
工作:
public ActionResult Report()
{
//...
doc1.Close();
byte[] byte1 = memoryStream1.ToArray();
return File(byte1, "application/pdf", "pdf_file_name.pdf");
}
我不知道为什么……但是,它起作用了!:链接