将 DOC 转换为 PNG 的问题

Question

我有一个奇怪的问题。我有 .dot 文件，我填充并转向 .doc 文件。然后我将这个 .doc 文件转换为图像。问题是，图像在本地主机上是完美的（高质量），而在实时服务器上质量很差。我的问题是，如何保存高质量的 .png（或任何其他）图像而不是低质量的图像？这很奇怪，因为相同的代码在本地主机上工作，但在实时服务器上失败。这是我使用的转换方法：

    private void ConvertDocToPNG(string startupPath, string filename1)
    {
        var docPath = Path.Combine(startupPath, filename1);
        Application app = new Application();
        Microsoft.Office.Interop.Word.Document doc = new Microsoft.Office.Interop.Word.Document();
        app.Visible = false;
        doc = app.Documents.Open(docPath);

        doc.ShowGrammaticalErrors = false;
        doc.ShowRevisions = false;
        doc.ShowSpellingErrors = false;

        //doc.ActiveWindow.ActivePane.View.Zoom.Percentage = 500;

        //Opens the word document and fetch each page and converts to image
        foreach (Microsoft.Office.Interop.Word.Window window in doc.Windows)
        {
            foreach (Microsoft.Office.Interop.Word.Pane pane in window.Panes)
            {
                for (var i = 1; i <= pane.Pages.Count; i++)
                {
                    Microsoft.Office.Interop.Word.Page page = null;
                    bool populated = false;
                    while (!populated)
                    {
                        try
                        {
                            // This !@#$ variable won't always be ready to spill its pages. If you step through
                            // the code, it will always work.  If you just execute it, it will crash.  So what
                            // I am doing is letting the code catch up a little by letting the thread sleep
                            // for a microsecond.  The second time around, this variable should populate ok.
                            page = pane.Pages[i];
                            populated = true;
                        }
                        catch (COMException ex)
                        {
                            Thread.Sleep(1);
                        }
                    }
                    var bits = page.EnhMetaFileBits;
                    var target = Path.Combine(startupPath + "\\", string.Format("{1}_page_{0}", i, filename1.Split('.')[0]));

                    try
                    {
                        using (var ms = new MemoryStream((byte[])(bits)))
                        {
                            var image = System.Drawing.Image.FromStream(ms);
                            var pngTarget = Path.ChangeExtension(target, "png");
                            image.Save(pngTarget, ImageFormat.Png);
                        }
                    }
                    catch (System.Exception ex)
                    {
                        doc.Close(true, Type.Missing, Type.Missing);
                        Marshal.ReleaseComObject(doc);
                        doc = null;
                        app.Quit(true, Type.Missing, Type.Missing);
                        Marshal.ReleaseComObject(app);
                        app = null;
                        throw ex;
                    }
                }
            }
        }
        doc.Close(true, Type.Missing, Type.Missing);
        Marshal.ReleaseComObject(doc);
        doc = null;
        app.Quit(true, Type.Missing, Type.Missing);
        Marshal.ReleaseComObject(app);
        app = null;
    }

Answer 1

尝试明确设置 res，

 Image image = Image.FromStream(ms);
 Bitmap myBitmap = new Bitmap( image, new Size( 320,480 ) ); 
 myBitmap.Save( "MyImage.png", System.Drawing.Imaging.ImageFormat.Png );