脚本从Google doc文档导出pdf

Question

我是Google脚本的新手，我想在容器绑定的Google文档中创建一个脚本，该文档通过选项菜单转换为PDF格式的Google文档。问题是，如果我修改文档，它将创建在我的文件夹中具有相同名称的同一文件，所以如果文件存在，我想覆盖它（更新更新），如你所见，我试图通过不同的版本调用，我被阻止了很长一段时间考虑^^。 如果你有同样的想法，我会很开心！非常感谢你。 :)

        function moveFile(sourceFileId, targetFolderId) {
      var file = DriveApp.getFileById(sourceFileId);
      file.getParents().next().removeFile(file);
      DriveApp.getFolderById(targetFolderId).addFile(file);
    }

    //Fonction standard ----->>>>> function to create or overwrite a file: si ça depasse 10 MB on genère une exception
    // Creates or replaces an existing file
    function updateFile (folder, filename, data) {
      try {
        // filename is unique, so we can get first element of iterator
        var file = folder.getFilesByName(filename).next()
        file.setContent(data)
      } catch(e) {
        folder.createFile(filename, data)
      }
    }
    function convert_to_pdf() {
      // Get the document to which this script is bound.
      var doc = DocumentApp.getActiveDocument();

       var templateFile = DriveApp.getFileById(doc.getId());

        var theBlob = templateFile.getBlob().getAs('application/pdf');
        var newPDFFile = DriveApp.createFile(theBlob);
        var fileName = templateFile.getName().replace(".", ""); //otherwise filename will be shortened after full stop    
        var name = newPDFFile.setName(fileName + ".pdf");

      file = DriveApp.getFileById(doc.getId());
      var parentFold = file.getParents();
      var folder = parentFold.next();
      var theId = folder.getId();
      var targetFolder = DriveApp.getFolderById(theId);

      Logger.log('targetFolder name: ' + targetFolder.getName());
        if( checkFile_in_a_Folder(name,folder) != 1){
            //on ajoute le fichier dans le repertoire courant targetFolder
           moveFile(newPDFFile.getId(), theId)  ;
           Logger.log('Move File');
        } 
        else{
          // updateFile (folder, newPDFFile, newPDFFile.getAs(MimeType.PDF));// get string content getAs(MimeType.PDF)
           Logger.log(' Update File ');

           // updateFile (folder, newPDFFile, newPDFFile.getBlob().getAs('application/pdf'));// get string content getAs(MimeType.PDF)
            Drive.Files.update({ title: newPDFFile.getName(), mimeType: newPDFFile.getMimeType()}, newPDFFile.getId(), theBlob);
        }
        //à la fin on ne va plus l'avoir dans RootFolder
         var rootFolder = DriveApp.getRootFolder();
         rootFolder.removeFile(newPDFFile);
     /**============ Ancien appel de fonction ====================**/ 
     // createPDFfile(doc.getId() , theId); 
    }
function checkFile_in_a_Folder(filename,foldername){
      var results = 0; //on suppose qu'on ne le trouve pas
      var folder = DriveApp.getFoldersByName(foldername);

      Logger.log(folder.hasNext());

      //Folder does not exist
      if(!folder.hasNext()){
       results = 0; 
      Logger.log("No Folder Found");

      }
      //Folder does exist
      else{
        Logger.log("Folder Found")
        var file   = folder.next().getFilesByName(filename);
        if(!file.hasNext()){
           Logger.log("No File Found");
           results = 0; 
        }
        else{
           Logger.log("File Found");
           results = 1; 
        }
      }
      return results;
    }