看源程序时碰到的问题

procedure TsampleForm.OpenDOCClick(Sender: TObject);
      var
        MemSize: Integer;
        Buffer: PChar;
        MyFile: TFileStream;
        Stream: TBlobStream;
      begin
        OpenDialog1.Filter:='WORD文档(*.DOC)|*.DOC';{从对话窗选择文件}
        if OpenDialog1.Execute then 
        begin
          MyFile:=TFileStream.Create(OpenDialog1.FileName,fmOpenRead);
          with table1 do   {‘table1’为含BLOB字段的表名}
          begin
            Open;
            Edit;
            Stream := TBlobStream.Create(FieldByName('Doc') as TBlobField, 
      bmWrite);{‘Doc’为BLOB字段名} 
            MemSize := MyFile.Size;
            Inc(MemSize); {Make room for the  buffer's null terminator.}
            Buffer := AllocMem(MemSize);       {Allocate the memory.} 
            try
              Stream.Seek(0, soFromBeginning);  {Seek 0 bytes from the stream's 
      end point}
              MyFile.Read(Buffer^,MemSize);
              Stream.Write(Buffer^,MemSize);
            finally
              MyFile.Free;
              Stream.Free;
            end;
                 try
                  Post;
                 except
                  on E: EDatabaseError do
                if HandelException(E)< >0 then 
                              exit
              else
              raise;
                 end;
           end;
           Doc_ole.CreateObjectFromFile(OpenDialog1.FileName,False);
           Doc_ole.Run;{Doc_ole为ToleContainer构件名}
         end;
      end;
 ###################
HandelException(E)< >0在这段代码中是什么意思呢？

[此贴子已经被作者于2006-4-10 23:21:25编辑过]