Question

我有以下代码打开PDF并添加一些文本和图像。有一次，我打开第二个PDF，将其包装在图像中并将其添加到PDF中。操作成功完成后，我想删除第二个PDF（我在图像中包含的那个）。问题是该文件现在已锁定，直到我重置我的ASP.NET应用程序。

在GetImageFromPdf方法中，您可以看到我正在创建第二个PdfReader实例。问题是，如果我关闭这个阅读器，我的Create方法中的阅读器也会被关闭！难道我做错了什么？还有另一种方法来实现我的目标吗？

以下是相关代码：

public void Create(string outputFilePath, bool preview = false)
{
    using (PdfReader reader = new PdfReader(FilePath))
    {
        using (PdfStamper stamper = new PdfStamper(reader, new FileStream(outputFilePath, FileMode.Create)))
        {
            PdfContentByte canvas = stamper.GetOverContent(1);

            ...

            AddMap(canvas, stamper);
        }
    }
}

...

private void AddMap(PdfContentByte Canvas, PdfStamper stamper)
{
    Image ImageWrapper = GetImageFromPdf(stamper.Writer, _MapFilePath);

    //set the position and scale the image
    ImageWrapper.ScaleAbsolute(152.5f, 152.5f);
    ImageWrapper.SetAbsolutePosition(58.5f, 197.5f);

    Canvas.AddImage(ImageWrapper);
}

...

public Image GetImageFromPdf(PdfWriter Writer, string MapFilePath)
{
    //since vector images are not supported natively by iTextSharp
    //we have saved the location maps as PDF (originally in eps format) 
    //we use GetImportedPage to import the file, and wrap it in an Image object so we can scale it

    //If I close this reader, the reader in the Create method is closed as well
    PdfReader reader = new PdfReader(MapFilePath);
    PdfImportedPage ImportedPage = Writer.GetImportedPage(reader, 1);

    return Image.GetInstance(ImportedPage);
}

Answer 1

试试这个

 using (PdfReader reader = new PdfReader(FilePath),PdfReader reader1 = new PdfReader(MapFilePath))
{
pass that reader1 object to AddMap method.
}

在iTextSharp中的using块中打开第二个PdfReader

1 个答案: