Question

我正在尝试使用powerpoint将.pptx文件无头转换为pdf文件。代码如下。问题是，如果用户因某些其他原因（例如创建幻灯片）打开了powerpoint，并且他们使用调用此代码的功能，那么他们的powerpoint应用程序将关闭。

我该如何避免这种情况？我有其他方法将ppt文件转换为pdf，但它们更慢。理想情况下，我会使用此方法而不是终止正在运行的实例（但在没有运行实例的情况下仍然可以清理）。最坏的情况是，如果powerpoint打开，我会使用较慢的打印方法。我不知道怎么做。

代码：

        private void ConvertPowerpointToPdf(string inputFile, string outputFile)
        {
            var powerPointApp = new Microsoft.Office.Interop.PowerPoint.ApplicationClass();
            Presentation presentation = null;
            Presentations presentations = null;

            try
            {
                presentations = powerPointApp.Presentations;
                presentation = presentations.Open(inputFile, ReadOnly: MsoTriState.msoFalse, WithWindow: MsoTriState.msoFalse, Untitled: MsoTriState.msoFalse);

                presentation.ExportAsFixedFormat(outputFile, PpFixedFormatType.ppFixedFormatTypePDF,
                PpFixedFormatIntent.ppFixedFormatIntentScreen, MsoTriState.msoFalse,
                PpPrintHandoutOrder.ppPrintHandoutVerticalFirst, PpPrintOutputType.ppPrintOutputSlides,
                MsoTriState.msoFalse, null, PpPrintRangeType.ppPrintAll, string.Empty, false, true, true, true, false,
                Type.Missing);
            }
            finally
            {

                if (presentation != null)
                {
                    presentation.Close();
                    Release(presentation);
                }

                Release(presentations);

                powerPointApp.Quit();
                Release(powerPointApp);
            }
        }

Answer 1

事实证明，你可以使用演示计数来检查这一点，如下所示。请注意，您必须小心释放资源。

        private void ConvertPowerpointToPdf(string inputFile, string outputFile)
        {
            var powerPointApp = new Microsoft.Office.Interop.PowerPoint.ApplicationClass();
            Presentation presentation = null;
            Presentations presentationList = null;

            try
            {
                presentationList = powerPointApp.Presentations;
                presentation = presentationList.Open(inputFile, ReadOnly: MsoTriState.msoFalse, WithWindow: MsoTriState.msoFalse, Untitled: MsoTriState.msoFalse);

                presentation.ExportAsFixedFormat(outputFile, PpFixedFormatType.ppFixedFormatTypePDF,
                PpFixedFormatIntent.ppFixedFormatIntentScreen, MsoTriState.msoFalse,
                PpPrintHandoutOrder.ppPrintHandoutVerticalFirst, PpPrintOutputType.ppPrintOutputSlides,
                MsoTriState.msoFalse, null, PpPrintRangeType.ppPrintAll, string.Empty, false, true, true, true, false,
                Type.Missing);
            }
            finally
            {

                if (presentation != null)
                {
                    presentation.Close();
                    Release(presentation);
                }

                bool allowQuit = true;
                if (presentationList != null)
                {
                    allowQuit = presentationList.Count == 0;
                    Release(presentationList);
                }

                if(allowQuit)
                    powerPointApp.Quit();

                Release(powerPointApp);
            }
        }

清理powerpoint应用程序而不关闭打开的实例

1 个答案: