c# - 如何使用 iTextSharp 将四个 "quarter pages"组合成一个全尺寸页面？

Question

我想在一个 PDF 页面上创建四个重复的"template"。每个季度页面中的“静态”信息将是相同的，但每个页面中的可变内容都不同。您可以将其视为登录表单或类似表单的四个“副本”，但以编程方式添加了条目，例如:

Real name: B. Clay Shannon
User name: Radicalia
Password: thatDarnedKatzenjammer
Email address: clay@pigeon.com

Real name: Albert L.B. Kollenborn
User name: Grandpa
Password: caseyJonesBigBrother1907
Email address: princealbertinacan@balpeenhammer.org

(右边还有两个)

我有创建文档并添加段落的代码，如下所示:

using (var ms = new MemoryStream())
{
    using (var doc = new Document(PageSize.A4, 25, 25, 25, 25))
    {
        using (var writer = PdfWriter.GetInstance(doc, ms))
        {
            doc.Open();

            Paragraph realName = new Paragraph("Real name:", 
times16BoldCyan);
            doc.Add(realName);
            . . .

这种事情适用于“普通”页面，但在上述情况下(四个四分之一的页面塞进一个页面)，我应该怎么做呢？应该是这样的:

    using (var msNorthWestQuadrant = new MemoryStream())
    {
        using (var docNorthWestQuadrant = new Document(PageSize.A4, 6.25, 
6.25, 6.25, 6.25))
        {
            using (var writer = PdfWriter.GetInstance(docNorthWestQuadrant, 
            msNorthWestQuadrant))
            {
                docNorthWestQuadrant.Open();

                Paragraph realName = new Paragraph("Real name:", 
times16BoldCyan);
                docNorthWestQuadrant.Add(realName);
                . . .

        using (var msNorthEastQuadrant = new MemoryStream())
        {
            using (var docNorthEastQuadrant = new Document(PageSize.A4, 
12.5, 12.5, 6.25, 6.25))
            {
                using (var writer = 
PdfWriter.GetInstance(docNorthEastQuadrant, msNorthEastQuadrant))
                {
                    docNorthEastQuadrant.Open();

                    Paragraph realName = new Paragraph("Real name:", 
times16BoldCyan);
                    docNorthEastQuadrant.Add(realName);
                    . . .

(等等 - 还有 SouthEastQuadrant 和 SouthEastQuadrant？)

...或者这是错误的方法？如果是，我需要的 PageSize 位置/大小的精确值是多少(上面的“1.25”只是一个大胆的猜测)。

更新

或者我需要一个“主”文档对象，然后像这样添加到主文档对象的四个“子”文档对象(伪代码):

using (var doc = new Document(PageSize.A4, 25, 25, 25, 25))

using (var docNorthwest = new Document(PageSize.A4, 6.25, 6.25, 6.25, 6.25))
. . .
docNorthwest.Add(par);
doc.Add(docNorthwest);
. . .
using (var docSouthwest = new Document(PageSize.A4, 6.25, 6.25, 6.25, 6.25))
docSouthwest.Add(par2);
doc.Add(docSouthwest);
. . .
using (var docSoutheast = new Document(PageSize.A4, 6.25, 6.25, 6.25, 6.25))
docSoutheast.Add(par3);
doc.Add(docSoutheast);
. . .
using (var docNortheast = new Document(PageSize.A4, 6.25, 6.25, 6.25, 6.25))
docNortheast.Add(par2);
doc.Add(docNortheast);
. . .

Answer 1

从上面的描述中，一个简单的方法来实现你的目标:

1. 创建一个内存中的Document
2. 将重复的内容放在Document的不同页面上
3. 使用 PdfPTable 将原始 Document 中的各个页面转储到新的 Document 中

首先，上面步骤1-2的一些测试数据:

byte[] GetMasterDocument(int count)
{
    using (var stream = new MemoryStream())
    {
        using (var document = new Document())
        {
            PdfWriter.GetInstance(document, stream);
            document.Open();
            for (int i = 1; i <= count; ++i)
            {
                document.Add(new Paragraph(string.Format(
@"Real name: real-name-{0:D4}
User name: user-name-{0:D4}
Password: password-{0:D4}
Email address: email-{0:D4}@invalid.com",
                 i)));
                if (i < count) document.NewPage();
            }
        }
        return stream.ToArray();
    }
}

将重复的内容转储到输出文件中:

PdfReader reader = new PdfReader(GetMasterDocument(38));
Rectangle pageSize = reader.GetPageSize(1);
using (FileStream stream = new FileStream(
    outputFile,
    FileMode.Create,
    FileAccess.Write))
{
    using (Document document = new Document(pageSize, 0, 0, 0, 0))
    {
        PdfWriter writer = PdfWriter.GetInstance(document, stream);
        document.Open();
        PdfPTable table = new PdfPTable(2);
        table.TotalWidth = pageSize.Width;
        table.LockedWidth = true;
        table.DefaultCell.Border = Rectangle.NO_BORDER;
        table.DefaultCell.FixedHeight = pageSize.Height / 2;

        for (int i = 1; i <= reader.NumberOfPages; i++)
        {
            PdfImportedPage page = writer.GetImportedPage(reader, i);
            table.AddCell(Image.GetInstance(page));
        }
        document.Add(table);
    }
}

如果重复内容和上面一样小，并且有太多空白空间，(页面缩放以适合 PdfPCell)在 GetMasterDocument() 中设置较小的页面大小>。 PageSize.A6 与上面的示例数据配合得很好: