NSStream-反向DNS查找错误 [英] NSStream - reverse DNS lookup error

问题描述

我必须将NSStream打开到只有数字地址而不是名称的wifi接入点. NSStream需要30-40秒才能打开套接字.在实验中，我发现从Windows盒远程登录到AP是瞬时的，但是在Mac上，则是30-40秒.在研究telnet时，我发现在Mac上的实现有所不同，因为它默认情况下会尝试进行名称查找.阅读telnet的手册页，我发现: -N防止在将目标主机指定为IP地址时使用IP地址命名查找.

I have to open an NSStream to a wifi access point that has only a numerical address, not a name. It takes NSStream 30-40 seconds to open a socket. In experimenting, i found that telnet-ing to the AP from a windows box was instantaneous, but on a mac, connecting the same 30-40 seconds. in researching telnet, i found that the implementation is a little different on a mac, in that it by default tries to to a name lookup. reading the manual page for telnet, i found: -N Prevents IP address to name lookup when destination host is given as an IP address.

当我使用"telnet -N IP地址端口"时，我的连接是瞬时的！我怀疑相同的问题正在导致我的NSStream连接延迟.有什么方法可以等同于在NSStream中设置"-N"标志吗?

when I used "telnet -N IP-address port", my connection was instantaneous! I suspect that this same problem is causing the delay in my NSStream connection. Is there any way to do the equivalent of setting the"-N" flag in NSStream?

推荐答案

NSHost在Cocoa Touch上似乎不可用，因此您无法强制使用给定地址的主机，尽管我不知道这是否否定了需求进行dns查找.

It looks like NSHost is not available on Cocoa Touch, so you cannot force a host with a given address, though I don't know if that negates the need for a dns lookup.

自2005年以来，这个问题就一直存在，尽管这可能不适用于Cocoa Touch库.无论如何，都没有给定的解决方案:

This problem has been around since 2005, though this might not apply to Cocoa Touch libraries. In any case there is no given solution:

• http://developer.apple.com/library/ios/#DOCUMENTATION/CoreFoundation/Reference/CFSocketRef/Reference/reference.html#//apple_ref/doc/c_ref/CFSocketCreate

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