[英]Pdf Merge Issue in ItextSharp (After Merging Pdfs don't retain their Values)
我们正在尝试使用ITextSharp合并三个PDF。 问题是合并后,我们只能从第一个PDF获取数据,而其他两个PDF不会保留其值。
所有这些PDF具有相同的结构(即,它们使用具有不同数据的相同模板),因此我假设它们具有相同的字段(AcroFields),这可能在合并时造成此问题。
这是合并代码:
public void MergeFiles(string destinationFile, string[] sourceFiles)
{
try
{
int f = 0;
string outFile = destinationFile;
Document document = null;
PdfCopy writer = null;
while (f < sourceFiles.Length)
{
// Create a reader for a certain document
PdfReader reader = new PdfReader(sourceFiles[f]);
// Retrieve the total number of pages
int n = reader.NumberOfPages;
//Trace.WriteLine("There are " + n + " pages in " + sourceFiles[f]);
if (f == 0)
{
// Step 1: Creation of a document-object
document = new Document(reader.GetPageSizeWithRotation(1));
// Step 2: Create a writer that listens to the document
writer = new PdfCopy(document, new FileStream(outFile, FileMode.Create));
// Step 3: Open the document
document.Open();
}
// Step 4: Add content
PdfImportedPage page;
for (int i = 0; i < n; )
{
++i;
if (writer != null)
{
page = writer.GetImportedPage(reader, i);
writer.AddPage(page);
}
}
PRAcroForm form = reader.AcroForm;
if (form != null)
{
if (writer != null)
{
writer.CopyAcroForm(reader);
}
}
f++;
}
// Step 5: Close the document
if (document != null)
{
document.Close();
}
}
catch (Exception)
{
//handle exception
}
}
这称为:
string[] sourcenames = { @"D:\1.pdf", @"D:\2.pdf", @"D:\3.pdf" };
string destinationname = @"D:\pdf\mergeall\merge3.pdf";
MergeFiles(destinationname, sourcenames);
我经过一番搜索才弄清楚了...以下是解决方案...
我创建了重命名PDF中的字段的功能,以便合并后的字段将被重命名。
private static int counter = 0;
private void renameFields(PdfReader pdfReader)
{
try
{
string prepend = String.Format("_{0}", counter++);
foreach (DictionaryEntry de in pdfReader.AcroFields.Fields)
{
pdfReader.AcroFields.RenameField(de.Key.ToString(), prepend + de.Key.ToString());
}
}
catch (Exception ex)
{
throw ex;
}
}
该函数在“ MergeFiles”函数中调用,如下所示...
// Create a reader for a certain document
PdfReader reader = new PdfReader(sourceFiles[f]);
renameFields(reader);
// Retrieve the total number of pages
int n = reader.NumberOfPages;
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