C#和Ghostscript.net导致错误(没有图片)

Question

我试图创建一个小程序来使用鬼怪脚本将PDF转换为TIF文件，但不幸的是，它导致了一个错误("null")。不知道为什么会失败：

    void button1_Click(object sender, EventArgs e)
    {
        OpenFileDialog openFileDialog1 = new OpenFileDialog();
        openFileDialog1.Filter = "PDF Files|*.pdf";
        if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            strfilename = openFileDialog1.FileName;
        }
    }

    void button2_Click(object sender, EventArgs e)
    {
        FolderBrowserDialog targetfolder = new FolderBrowserDialog();
        if (targetfolder.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            folder = targetfolder.SelectedPath;
        }
    }

    void button3_Click(object sender, EventArgs e)
    {
        const string DLL_64BITS = "gsdll64.dll";
        string NomeGhostscriptDLL;
        NomeGhostscriptDLL = DLL_64BITS;
        GhostscriptVersionInfo gvi = new GhostscriptVersionInfo(NomeGhostscriptDLL);
        ///var xDpi = 300;
        var yDpi = 300;
        using (var rasterizer = new GhostscriptRasterizer())
        {
            byte[] buffer = File.ReadAllBytes(strfilename);
            MemoryStream ms = new MemoryStream(buffer);
            rasterizer.Open(ms, gvi, true);
            int PdfPages = rasterizer.PageCount;
            for (int pageNumber = 1; pageNumber < rasterizer.PageCount; pageNumber++)
            {
                string outputTIFPath = Path.Combine(folder, "00" + pageNumber.ToString() + ".tiff");
                Image pdf2TIF = rasterizer.GetPage(yDpi, pageNumber);
                MessageBox.Show(outputTIFPath);
                pdf2TIF.Save(outputTIFPath, ImageFormat.Tiff);
            }
            rasterizer.Close();
        }
    }

错误如下所示

​

有人能帮我解决这个问题吗？

Answer 1

尝试添加以下内容

MyPlaceHolder.Controls.Add(pd2TIF);

如下所示：

Image pdf2TIF = rasterizer.GetPage(yDpi, pageNumber);

我只是在另一条线上读到的。我不能百分之百确定它是否有效