Question

socket编程 ipv4代码改造成ipv6代码，谁能帮我？

int Terminal::ConnectTo(char *ip,int nPort,int nTimeOut)
{
socklen_t svrlen;
struct sockaddr_in localaddr;
int sockls;
int ret,flag,error=1;
struct pollfd pollflag;

svrlen = sizeof(localaddr);
memset( (char *)&localaddr, 0, svrlen);

localaddr.sin_family = AF_INET;
localaddr.sin_addr.s_addr = inet_addr(ip);

localaddr.sin_port = htons( nPort );

if( ( sockls = socket(AF_INET, SOCK_STREAM, 0) ) == -1 )
{
//WriteLog(__FILE__,__LINE__,"socket error");
return -1;
}

flag = fcntl( sockls, F_GETFL, 0 );
if( fcntl( sockls, F_SETFL, flag | O_NONBLOCK ) == -1 )
{
//WriteLog(__FILE__,__LINE__, "fcntl error");
close(sockls);
return -2;
}

if( connect(sockls,(const struct sockaddr *)&localaddr,svrlen) != 0 )
{
if( errno == EINPROGRESS )
{
pollflag.fd = sockls;
pollflag.events = POLLOUT;

ret = poll( &pollflag, 1, nTimeOut*1000 );

if( ret <= 0 )
{
close(sockls);
return -3;
}

svrlen = sizeof(error);

if( getsockopt(sockls,SOL_SOCKET,SO_ERROR,&error,&svrlen) == -1 )
{
close(sockls);
return -4;
}

if( error != 0 )
{
close(sockls);
return -5;
}
}
else
{
close(sockls);
return -6;
}
}

return sockls;
}
iOS中要兼容ipv4和ipv6，但我修改后ipv6环境跑不通

Answer 1

//下面使用MySql Connector/net提供的专用对象
　　MySqlConnection mycon = new MySqlConnection(constr);
　　mycon.Open();
　　MySqlCommandmycmd = new MySqlCommand("select * from users", mycon);
　　MySqlDataReader myreader = mycmd.ExecuteReader();
　　while (myreader.Read())