p;            AfxMessageBox("Couldn''t start Powerpoint.");
                   }
               else
               {
                // Make Powerpoint Visible and display a message
                app.SetVisible(TRUE);
                TRACE("Powerpoint is Running!");
                   }
         }

（7）       在硬盘中打开一个展示，在Open按钮函数呼叫中添加代码：
         void CPowerPntDlg::OnBtnOpen()
         {
                  static char BASED_CODE szFilter = "Powerpoint Files (*.ppt)|*.ppt||";
                  CFileDialog FileDlg(TRUE,"PPT",NULL,OFN_FILEMUSTEXIST|OFN_NONETWORKBUTTON|OFN_PATHMUSTEXIST,szFilter);
                  FileDlg.DoModal();

                // To get the selected file''s path and name
                  CString strFileName;
                  strFileName = FileDlg.GetPathName();

                  if(!strFileName.IsEmpty())
                  {
                       Presentations = app.GetPresentations();
                       Presentation = Presentations.Open(strFileName,0,0,1);
                  }
         }
（8）