用ICMP的ping命令就可以阿!我这里有一些介绍,希望对你有所帮助!先,对编程中需要的动态链接库作一简要说明:在Windows的System目录下 ,你可以找到Icmp.dll文件,该动态链接库提供了ICMP协议的所有功能,我们的 编程就建立在对该动态链接库的调用上。Icmp.dll文件内的调用函数说明如下: 1、IcmpCreateFile 打开一个句柄,通过该句柄你可以发送ICMP的请求 回送报文。 2、IcmpCloseHandle 关闭你通过IcmpCreateFile函数打开的句柄。 3、IcmpSendEcho 通过你打开的句柄发送ICMP请求,在超时或应答报 文接收后返回。其参数基本上和它的帧结构一致,可参看下面的程序部分,其具体含意你可以参看有关ICMP协议的书籍。 初步了解了上述的三个函数后,我们就可以开始编程了。 首先,我们的程序运行后应该有如图1所示的基本功能。为此,我们可先在 Delphi的窗口中放入右上图中所示的控件,如按钮、编辑框和文本显示框等。 然后,在程序的开始部分(FormCreate)对WinSocket进行初始化,其作用是 申明使用的版本信息,同时调入Icmp.dll库。 type PIPOptionInformation = ^TIPOptionInformation; TIPOptionInformation = packed record TTL: Byte; TOS: Byte; Flags: Byte; OptionsSize: Byte; OptionsData: PChar; end; PIcmpEchoReply = ^TIcmpEchoReply; TIcmpEchoReply = packed record Address: DWORD; Status: DWORD; RTT: DWORD; DataSize: Word; Reserved: Word; Data: Pointer; Options: TIPOptionInformation ; end; TIcmpCreateFile = function: THandle; stdcall; TIcmpCloseHandle = function(IcmpHandle: THandle):Boolean;stdcall;TIcmpSendEcho=function(IcmpHandle:THandle;DestinationAddress:DWORD; RequestData:Pointer;RequestSize:Word;RequestOptions:IPOptionInformation; ReplyBuffer: Pointer;ReplySize: DWord;Timeout: DWord): DWord; stdcall; TMyPing = class(TForm) Panel1: TPanel; Label1: TLabel; PingEdit: TEdit; ExeBtn: TButton; Button2: TButton; Button3: TButton; StatusShow: TMemo; procedure Button3Click(Sender: TObject); procedure FormCreate(Sender: TObject); procedure ExeBtnClick(Sender: TObject); private { Private declarations } hICMP: THANDLE; IcmpCreateFile : TIcmpCreateFile; IcmpCloseHandle: TIcmpCloseHandle; IcmpSendEcho: TIcmpSendEcho; public { Public declarations } end; procedure TMyPing.FormCreate(Sender: TObject); var WSAData: TWSAData; hICMPdll: HMODULE; begin // Load the icmp.dll stuff hICMPdll := LoadLibrary('icmp.dll'); @ICMPCreateFile := GetProcAddress(hICMPdll, 'IcmpCreateFile'); @IcmpCloseHandle := GetProcAddress(hICMPdll, 'IcmpCloseHandle'); @IcmpSendEcho := GetProcAddress(hICMPdll, 'IcmpSendEcho'); hICMP := IcmpCreateFile; StatusShow.Text := ''; StatusShow.Lines.Add('目的IP地址 字节数 返回时间(毫秒)'); end; //接下来,就要进行如下所示的Ping操作的实际编程过程了。 procedure TMyPing.ExeBtnClick(Sender: TObject); var IPOpt:TIPOptionInformation;// IP Options for packet to send FIPAddress:DWORD; pReqData,pRevData:PChar; pIPE:PIcmpEchoReply;// ICMP Echo reply buffer FSize: DWORD; MyString:string; FTimeOut:DWORD; BufferSize:DWORD; begin if PingEdit.Text <> '' then begin FIPAddress := inet_addr(PChar(PingEdit.Text)); FSize := 40; BufferSize := SizeOf(TICMPEchoReply) + FSize; GetMem(pRevData,FSiz e); GetMem(pIPE,BufferSize); FillChar(pIPE^, SizeOf(pIPE^), 0); pIPE^.Data := pRevData; MyString := 'Hello,World'; pReqData := PChar(MyString); FillChar(IPOpt, Sizeof(IPOpt), 0); IPOpt.TTL := 64; FTimeOut := 4000; IcmpSendEcho(hICMP, FIPAddress, pReqData, Length(MyString), @IPOpt, pIPE, BufferSize, FTimeOut); if pReqData^ = pIPE^.Options.OptionsData^ then begin StatusShow.Lines.Add(PChar(PingEdit.Text) + ' ' +IntToStr(pIPE^.DataSize) + ' ' +IntToStr(pIPE^.RTT)); end; FreeMem(pRevData); FreeMem(pIPE); end end; 通过上面的编程,我们就实现了Ping功能的界面操作。实际上,ICMP协议的功能还 有很多,都可以通过对Icmp.dll的函数调用来实现。
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货