Delphi Code - Open Microsoft Word File and Save as PDF File

procedure TForm1.OpenMicrosoftWordFileAndSaveAsPDFFile(Sender: TObject);
var
   WordFileName, PDFFileName: String;
   WordApplication, WordFile: Variant;
begin
     //be sure ComObj and Variants units are included in the "uses" clause

     WordFileName := 'C:\PhysiologyWeb\delphi_code_examples\word_file.docx'; //replace file name with the name of your file
     PDFFileName := ChangeFileExt(WordFileName, '.pdf');

     WordApplication := Null;
     WordFile := Null;

     try
        //create Word OLE
        WordApplication := CreateOleObject('Word.Application');
     except
           WordApplication := Null;
           //add error/exception handling code as desired
     end;

     If VarIsNull(WordApplication) = False then
        begin
             try
                WordApplication.Visible := True; //set to False if you do not want to see the activity in the background
                WordApplication.DisplayAlerts := False; //ensures message dialogs do not interrupt the flow of your automation process. May be helpful to set to True during testing and debugging.

                //Open Word File
                try
                   WordFile := WordApplication.Documents.Open(WordFileName);
                   //reference
                   //https://docs.microsoft.com/en-us/office/vba/api/word.documents.open
                except
                      WordFile := Null;
                      //add error/exception handling code as desired
                end;

                If VarIsNull(WordFile) = False then
                   begin
                        WordFile.SaveAs2(PDFFileName, 17); //wdFormatPDF = 17
                        //reference
                        //https://docs.microsoft.com/en-us/office/vba/api/word.saveas2
                   end;
             finally
                    WordFile.Close;
                    WordApplication.DisplayAlerts := True;
                    WordApplication.Quit;

                    WordFile := Unassigned;
                    WordApplication := Unassigned;
             end;
        end;
end;