Unity3D:Unity3D读取PDF内容

最近在研究Unity3D中读取PDF的内容,预想了三种方案,一是用Java来实现,二是调用C#的iTextSharp库或者PDFBox库来实现,三是下载PDF Renderer插件(土豪可以买这个插件,支持的系统也比较全面),java不是很精通,我就研究了一下C#调用iTextSharp库来实现,但是遗憾的是不支持UWP系统。

再写代码之前呢,得在Assets下的Plugins文件夹中导入itextsharp.dll、Spire.Pdf.dll、Spire.License.dll、System.Drawing.dll库,才能好使。

直接上传代码:

    //读取PDF文字内容
    private void ReadPDF_Click()
    {
        string path = Application.streamingAssetsPath + "/SimplePDF.pdf";
        msg.text = OnCreated(path);
    }

    private string OnCreated(string filepath)
    {
        try
        {
            string pdffilename = filepath;
            PdfReader pdfReader = new PdfReader(pdffilename);
            int numberOfPages = pdfReader.NumberOfPages;
            string text = string.Empty;

            for (int i = 1; i <= numberOfPages; ++i)
            {
                iTextSharp.text.pdf.parser.ITextExtractionStrategy strategy = new iTextSharp.text.pdf.parser.SimpleTextExtractionStrategy();
                text += iTextSharp.text.pdf.parser.PdfTextExtractor.GetTextFromPage(pdfReader, i, strategy);
            }
            pdfReader.Close();

            return text;
        }
        catch (Exception ex)
        {
            StreamWriter wlog = File.AppendText(System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "\\mylog.log");
            wlog.WriteLine("出错文件:" + "原因:" + ex.ToString());
            wlog.Flush();
            wlog.Close();
            return null;
        }
    }

 //读取PDF中的图片
    private void ReadPDFImage()
    {
        string path = Application.streamingAssetsPath + "/aa.pdf";
        ExtractImageEvent(path);
    }

    private void ExtractImageEvent(string padPath)
    {
        try
        {
            int index = 0;
            PdfReader pdfReader = new PdfReader(padPath);
            Debug.Log(pdfReader.NumberOfPages);
            for (int pageNumber = 1; pageNumber <= pdfReader.NumberOfPages; pageNumber++)
            {
                PdfReader pdf = new PdfReader(padPath);
                PdfDictionary pg = pdf.GetPageN(pageNumber);
                PdfDictionary res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
                PdfDictionary xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
                try
                {
                    foreach (PdfName name in xobj.Keys)
                    {
                        PdfObject obj = xobj.Get(name);
                        if (obj.IsIndirect())
                        {
                            PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
                            string width = tg.Get(PdfName.WIDTH).ToString();
                            string height = tg.Get(PdfName.HEIGHT).ToString();
                            //ImageRenderInfo imgRI = ImageRenderInfo.CreateForXObject((GraphicsState)new Matrix(float.Parse(width), float.Parse(height)), (PRIndirectReference)obj, tg);
                            ImageRenderInfo imgRI = ImageRenderInfo.CreateForXObject(new GraphicsState(), (PRIndirectReference)obj, tg);
                            RenderImageByte(imgRI,index);
                            
                        }
                    }
                }
                catch
                {      continue; }
            }
        }
        catch (Exception)
        {

            throw;
        }
    }
   
    private void RenderImageByte(ImageRenderInfo renderInfo,int index)
    {
        PdfImageObject imageObj = renderInfo.GetImage();
        pimage = imageObj.GetDrawingImage();
        MemoryStream ms = new MemoryStream();
        pimage.Save(ms, ImageFormat.Png);
        byte[] byteData = new Byte[ms.Length];
        ms.Position = 0;
        ms.Read(byteData, 0, byteData.Length);
        ms.Close();
        Texture2D tex2d = new Texture2D(500, 1000);
        if (tex2d.LoadImage(byteData))
        {
            UIimage.texture = tex2d;
        }
         
        ///保存到本地
        //Bitmap dd = new Bitmap(pimage);
        //dd.Save(Application.dataPath + "/Resources/wode.Jpeg");

    }


我只测试了windows下好使,其他的没有测试,希望大家能够用得着,也可以测试一下其他的系统。

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