如何创建IP地址和端口以与NSData一起使用

Question

我正在使用一个名为的库，GCDAsyncUDPSocket并且有一种方法要求我将IP地址和端口作为传递NSData。

谢谢您的帮助。

Answer 1

从头文件：

 * Binds the UDP socket to the given address, specified as a sockaddr structure wrapped in a NSData object.
 * 
 * If you have an existing struct sockaddr you can convert it to a NSData object like so:
 * struct sockaddr sa  -> NSData *dsa = [NSData dataWithBytes:&remoteAddr length:remoteAddr.sa_len];
 * struct sockaddr *sa -> NSData *dsa = [NSData dataWithBytes:remoteAddr length:remoteAddr->sa_len];

因此，您需要一个sockaddr：

#include <netinet/in.h>
#include <arpa/inet.h>

struct sockaddr_in ip;
ip.sin_family = AF_INET;
ip.sin_port = htons(6003);
inet_pton(AF_INET, "0.0.0.0", &ip.sin_addr);

NSData * discoveryHost = [NSData dataWithBytes:&ip length:ip.sin_len];

以下是一些文档-http sockaddr: //www.beej.us/guide/bgnet/output/html/multipage/sockaddr_inman.html