//use WinSock; function GetHostFromIP(ip: string): string; var sData: TWSAData; h: PHostEnt; p: TInAddr; begin Result := ''; //CheckIP;//检查IP是否合法,你自己写 // if (not CheckIP) or (WSAStartup($101, sData)) = SOCKET_ERROR then Exit; if WSAStartup($101, sData) = SOCKET_ERROR then Exit; p.S_addr := inet_addr(PChar(ip)); h := gethostbyaddr(@p.S_addr, 4, AF_INET); if h <> nil then Result := h^.h_name; WSACleanup; end; if GetHostFromIP('192.168.0.1') = '' then //没有这个IP地址
给你一个简单的代码: uses WinInet;procedure TForm1.Button5Click(Sender: TObject); begin if (GetSystemMetrics(SM_NETWORK) AND $01 = $01) then showmessage('已连接到网络上!') else showmessage('未连接到网络上!'); end;
var
sData: TWSAData;
h: PHostEnt;
p: TInAddr;
begin
Result := '';
//CheckIP;//检查IP是否合法,你自己写
// if (not CheckIP) or (WSAStartup($101, sData)) = SOCKET_ERROR then Exit;
if WSAStartup($101, sData) = SOCKET_ERROR then Exit;
p.S_addr := inet_addr(PChar(ip)); h := gethostbyaddr(@p.S_addr, 4, AF_INET);
if h <> nil then Result := h^.h_name;
WSACleanup;
end; if GetHostFromIP('192.168.0.1') = '' then //没有这个IP地址
uses
WinInet;procedure TForm1.Button5Click(Sender: TObject);
begin
if (GetSystemMetrics(SM_NETWORK) AND $01 = $01) then
showmessage('已连接到网络上!')
else
showmessage('未连接到网络上!');
end;
访问局域网文件
except
showmessage('网络不通');
end;