在iOS中打开socket连接后如何知道服务器IP地址

Question

我打开了一个套接字连接。 我想知道服务器 IP 地址

    NSString *urlString = [NSString stringWithFormat:@"http://sample.com"];

    NSURL *website = [NSURL URLWithString:urlString];
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, ( CFStringRef)[website host], [portNo intValue], &readStream, &writeStream);
    
    CFReadStreamSetProperty(readStream,kCFStreamNetworkServiceType,kCFStreamNetworkServiceTypeVoIP);
    CFWriteStreamSetProperty(writeStream,kCFStreamNetworkServiceType,kCFStreamNetworkServiceTypeVoIP);

    inputStream = ( NSInputStream *)readStream;
    outputStream = ( NSOutputStream *)writeStream;
    [inputStream open];
    [outputStream open];

Answer 1

您可以进行 DNS 查找并获取此信息。 可以对任何主机名执行 DNS 查找。 请参阅此处： 如何在 iOS 上执行 DNS 查询