iText7 在内存中创建 PDF 而不是物理文件
[英]iText7 Create PDF in memory instead of physical file
问题描述
How do one create PDF in memorystream instead of physical file using itext7?
如何使用 itext7 在内存流中创建 PDF 而不是物理文件？ I have no idea how to do it in the latest version, any help?我不知道如何在最新版本中做到这一点，有什么帮助吗？
I tried the following code, but pdfSM is not properly populated:我尝试了以下代码，但 pdfSM 未正确填充：
string filePath = "./abc.pdf";
MemoryStream pdfSM = new ByteArrayOutputStream();
PdfDocument doc = new PdfDocument(new PdfReader(filePath), new PdfWriter(pdfSM));
.......
doc.close();
The full testing code as below for your reference, it worked when past filePath into PdfWriter but not for the memory stream:完整的测试代码如下供您参考，它在将 filePath 传递到 PdfWriter 时有效，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();
}
3 个解决方案
解决方案1
20 2018-03-12 15:49:55
This works for me.这对我有用。
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();
}
解决方案2
2 2020-11-03 22:51:56
I needed the same thing.我需要同样的东西。 Got it working like this: (I included some settings which improve performance)让它像这样工作：（我包括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;
解决方案3
1 2020-03-13 07:03:34
iText7、C# Controller iText7、C#控制器
Error:错误：
public ActionResult Report()
{
//...
doc1.Close();
return File(memoryStream1, "application/pdf", "pdf_file_name.pdf");
}
Work:工作：
public ActionResult Report()
{
//...
doc1.Close();
byte[] byte1 = memoryStream1.ToArray();
return File(byte1, "application/pdf", "pdf_file_name.pdf");
}
I don't know why... but, it's working!我不知道为什么......但是，它的工作！
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