c# - 在c#中添加水印图片

Question

我有这个小代码可以在 doc 文件中添加水印图像，只有一个小问题，如果我转换一次它就可以正常工作，但是如果我尝试转换另一个文件就会出现这个错误:

The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

在这一行中:

wordFile = oWord.Documents.Open(row.filename);

这是我的代码:

Microsoft.Office.Interop.Word.Application oWord = new Microsoft.Office.Interop.Word.Application();
        Document wordFile = new Document();

        //OTHER VARIABLES
        Object oClassType = "Word.Document.8";
        Object oTrue = true;
        Object oFalse = false;
        Object oMissing = System.Reflection.Missing.Value;

private void BtnInserirImagem_Click(object sender, RoutedEventArgs e)
        {
            foreach(MyDocsList row in dataGridList.Items)
            {
                wordFile = oWord.Documents.Open(row.filename);
                addWatermark(wordFile, row.filename);

                //QUITTING THE APPLICATION
                oWord.Quit(ref oMissing, ref oMissing, ref oMissing);
            }
        }

        private void addWatermark(Document doc, string filename)
        {
            object refmissing = System.Reflection.Missing.Value;
            string watermarkPath = Directory.GetCurrentDirectory() + "\\fundo.jpg";

            if (File.Exists(watermarkPath))
            {

                object linkToFile = false;
                object saveWithDocument = true;

                WdHeaderFooterIndex hfIndex = WdHeaderFooterIndex.wdHeaderFooterPrimary;

                HeaderFooter headerFooter;

                for (int i = 1; i < doc.Sections.Count + 1; i++)
                {

                    if (doc.Sections[i].Headers != null)
                    {
                        headerFooter = doc.Sections[i].Headers[hfIndex];
                    }
                    else if (doc.Sections[i].Footers != null)
                    {
                        headerFooter = doc.Sections[i].Footers[hfIndex];
                    }
                    else
                    {
                        headerFooter = null;
                    }

                    if (headerFooter != null)
                    {

                        try
                        {
                            Microsoft.Office.Interop.Word.Shape watermarkShape;
                            watermarkShape = headerFooter.Shapes.AddPicture(watermarkPath, ref linkToFile, ref saveWithDocument, ref refmissing,
                                                                            ref refmissing, ref refmissing, ref refmissing, ref refmissing);

                            watermarkShape.Left = Convert.ToSingle(WdShapePosition.wdShapeLeft);
                            watermarkShape.Top = Convert.ToSingle(WdShapePosition.wdShapeCenter);
                        }
                        catch (System.Runtime.InteropServices.COMException e)
                        {
                            MessageBoxResult result = MessageBox.Show(String.Format("{0} - Error Code = {1}", e.Message, e.ErrorCode));
                            throw e;
                        }
                    }
                }

                oWord.ActiveWindow.View.SeekView = WdSeekView.wdSeekMainDocument;
                oWord.ActiveWindow.ActivePane.View.Type = Microsoft.Office.Interop.Word.WdViewType.wdPrintView;
            }
            else
            {
                MessageBoxResult result = MessageBox.Show("Could not find watermark image");
            }

            //THE LOCATION WHERE THE FILE NEEDS TO BE SAVED
            string outstringFile="";
            string pathfile = System.IO.Path.GetDirectoryName(filename);
            string filenameFile = System.IO.Path.GetFileName(filename);
            outstringFile = pathfile + "\\OG" + filenameFile;

            Object oSaveAsFile = (Object)(outstringFile);

            wordFile.SaveAs(ref oSaveAsFile, ref oMissing, ref oMissing, ref oMissing,
                ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
                ref oMissing, ref oMissing);


            //CLOSING THE FILE
            wordFile.Close(ref oFalse, ref oMissing, ref oMissing);


        }

Answer 1

取自http://social.msdn.microsoft.com/Forums/en-NZ/vbinterop/thread/2c8689e4-4f8c-42c1-b092-f8ae41b9779c

When you first launch Word programmatically, it connects to Word via an RPC server. When you close the document, this server gets closed without your application knowing about it. The solution is to trap an error and re-initialise your Word object. you will then be able to continue.

编辑:

您在外部初始化您的 oWord 对象，并且只初始化一次。然后，您在第一次运行的 foreach 循环中调用 .Quit() 方法，此后它不再可用。您将不得不删除 BtnInserirImagem_Click 中的 oWord.Quit(); 并使用不断初始化的 word 对象，或者您可以在需要时对其进行初始化，然后在其上调用 quit .

    Document wordFile = new Document();

    //OTHER VARIABLES
    Object oClassType = "Word.Document.8";
    Object oTrue = true;
    Object oFalse = false;
    Object oMissing = System.Reflection.Missing.Value;

    private void BtnInserirImagem_Click(object sender, RoutedEventArgs e)
    {
        //Init Word App Object here
        Microsoft.Office.Interop.Word.Application oWord = new Microsoft.Office.Interop.Word.Application();

        foreach (MyDocsList row in dataGridList.Items)
        {
            wordFile = oWord.Documents.Open(row.filename);
            //pass the Word App instance
            addWatermark(wordFile, row.filename, oWord);
        }
        // Quitting oWord outside of the loop
        oWord.Quit(ref oMissing, ref oMissing, ref oMissing);
    }

    //added the Word App instance to the signature
    private void addWatermark(Document doc, object filename, Microsoft.Office.Interop.Word.Application oWord)
    {
        object refmissing = System.Reflection.Missing.Value;
        string watermarkPath = Directory.GetCurrentDirectory() + "\\fundo.jpg";

        if (File.Exists(watermarkPath))
        {

            object linkToFile = false;
            object saveWithDocument = true;

            WdHeaderFooterIndex hfIndex = WdHeaderFooterIndex.wdHeaderFooterPrimary;

            HeaderFooter headerFooter;

            for (int i = 1; i < doc.Sections.Count + 1; i++)
            {

                if (doc.Sections[i].Headers != null)
                {
                    headerFooter = doc.Sections[i].Headers[hfIndex];
                }
                else if (doc.Sections[i].Footers != null)
                {
                    headerFooter = doc.Sections[i].Footers[hfIndex];
                }
                else
                {
                    headerFooter = null;
                }

                if (headerFooter != null)
                {

                    try
                    {
                        Microsoft.Office.Interop.Word.Shape watermarkShape;
                        watermarkShape = headerFooter.Shapes.AddPicture(watermarkPath, ref linkToFile, ref saveWithDocument, ref refmissing,
                                                                        ref refmissing, ref refmissing, ref refmissing, ref refmissing);

                        watermarkShape.Left = Convert.ToSingle(WdShapePosition.wdShapeLeft);
                        watermarkShape.Top = Convert.ToSingle(WdShapePosition.wdShapeCenter);
                    }
                    catch (System.Runtime.InteropServices.COMException e)
                    {
                        MessageBoxResult result = MessageBox.Show(String.Format("{0} - Error Code = {1}", e.Message, e.ErrorCode));
                        throw e;
                    }
                }
            }

            oWord.ActiveWindow.View.SeekView = WdSeekView.wdSeekMainDocument;
            oWord.ActiveWindow.ActivePane.View.Type = Microsoft.Office.Interop.Word.WdViewType.wdPrintView;
        }
        else
        {
            MessageBoxResult result = MessageBox.Show("Could not find watermark image");
        }

        //THE LOCATION WHERE THE FILE NEEDS TO BE SAVED
        string outstringFile = "";
        string pathfile = System.IO.Path.GetDirectoryName(filename);
        string filenameFile = System.IO.Path.GetFileName(filename);
        outstringFile = pathfile + "\\OG" + filenameFile;

        Object oSaveAsFile = (Object)(outstringFile);

        wordFile.SaveAs(ref oSaveAsFile, ref oMissing, ref oMissing, ref oMissing,
            ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
            ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
            ref oMissing, ref oMissing);

        //CLOSING THE FILE
        wordFile.Close(ref oFalse, ref oMissing, ref oMissing);
    }