我參照各位先進的做法，使用IdIcmpClient實現Ping功能。在Administrator時正常，但是在普通用戶群組下則出現Socket Error #10013 錯誤。我應該如何設定權限（添加何種權限給Users群組）?

這是 Indy KB 拷貝過來的：    10.1 I can not ping with Indy on Windows NT or Windows 2000. What do I do about this? In Windows NT and Windows 2000, Indy's TIdICMPClient requires administrative privileges to use raw sockets. The command line PING application does not exhibit this behavior because Microsoft chose to use undocumented calls in ICMP.DLL and its winsock implementation to get around the issue. In short: they cheated. Indy does not use ICMP.DLL to maintain Linux compatibility, and allow use of both Raw sockets and ICMP sockets.

謝謝yhchu的回答。 我的目的是要預先知道對方的IP是否有效（機器是否啟動），避免花長時間去連接一個無效的IP。那麽我是否可以用其它方式來達到目的亦或有其它實現Ping的方法。謝謝!

沒有人可以幫忙嗎？

我已經解決了。再次感謝yhchu 具體方法實際是調用icmp.dll中的Function。請各位參照: http://delphi.about.com/od/internetintranet/l/aa081503a.htm