速度好像太快了

Question

procedure TForm1.Button1Click(Sender: TObject);
begin
ShellExecute(handle,'open','cmd.exe',pchar(' /k "dir '+edit1.text+' > c:\lp.txt"'),'',SW_HIDE);
Memo1.Lines.LoadFromFile('c:\lp.txt');
end;
end.
我用以上代码实现运行DOS命令，但C：\lp.txt还没有建立号MEMO就开始加载了，结果总是提示错误，第二次在运行就可以看见正确结果了，有什么办法让他慢一点吗？

Answer 1

function WinExecAndWait32(FileName:String; Visibility: Integer): Integer;
var
  zAppName:array[0..512] of char;
  zCurDir:array[0..255] of char;
  WorkDir:String;
  StartupInfo:TStartupInfo;
  ProcessInfo:TProcessInformation;
begin
  StrPCopy(zAppName,FileName);
  GetDir(0,WorkDir);
  StrPCopy(zCurDir,WorkDir);
  FillChar(StartupInfo,Sizeof(StartupInfo),#0);
  StartupInfo.cb := Sizeof(StartupInfo);  StartupInfo.dwFlags := STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow := Visibility;  if not CreateProcess(nil,
    zAppName,                      { pointer to command line string }
    nil,                           { pointer to process security attributes }
    nil,                           { pointer to thread security attributes }
    false,                         { handle inheritance flag }
    CREATE_NEW_CONSOLE or          { creation flags }
    NORMAL_PRIORITY_CLASS,
    nil,                           { pointer to new environment block }
    nil,                           { pointer to current directory name }
    StartupInfo,                   { pointer to STARTUPINFO }
    ProcessInfo) then Result := -1 { pointer to PROCESS_INF }  else begin
     WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
    //GetExitCodeProcess(ProcessInfo.hProcess,Result);
    Result := 0;
  end;
end;WinExecAndWait32(cmd,1); //调用

Answer 2

这么麻烦，还不如加一句showmessage('open now')