;// will destroy document

                     return NULL;

              }

       }

       else

       {

              CWaitCursor wait;



              // open an existing document

              bWasModified = pDocument->IsModified();

              pDocument->SetModifiedFlag(FALSE);

              //OnOpenDocument函数重新初始化文档对象

              if (!pDocument->OnOpenDocument(lpszPathName))

              {

                     if (bCreated)

                     {

                //新建文档的情况

                            pFrame->DestroyWindow();    

                     }

                     else if (!pDocument->IsModified())

                     {

                            // 文档没有被修改，恢复原来文档的修改标志

                            pDocument->SetModifiedFlag(bWasModified);

                     }

                     else

                     {