可以使用IP_BOUND_IF的方式藤树，切換網(wǎng)卡:
- 使用"ifaddrs.h"中的"getifaddrs"來獲取interface addresses
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
NSInteger success = getifaddrs(&interfaces);
if (success == 0) {
// Loop through linked list of interfaces
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
// Get NSString from C String
NSString* ifaName = [NSString stringWithUTF8String:temp_addr->ifa_name];
NSString* address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *) temp_addr->ifa_addr)->sin_addr)];
NSString* mask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *) temp_addr->ifa_netmask)->sin_addr)];
NSString* gateway = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *) temp_addr->ifa_dstaddr)->sin_addr)];
NSLog(@"%@;%@;%@;%@",ifaName,address,mask,gateway);
}
temp_addr = temp_addr->ifa_next;
}
}
然后你將會(huì)在控制臺(tái)看見類似如下信息:
lo0;127.0.0.1;255.0.0.0;127.0.0.1
pdp_ip0;10.9.163.185;255.255.255.255;10.9.163.185
en0;10.0.0.6;255.255.0.0;10.0.255.255
("pdp_ip0" 代表了蜂窩網(wǎng)絡(luò))
- 使用"net/if.h"中的"if_nametoindex"和"sys/socket.h"中的"setsockopt"，向特定的interface發(fā)送消息
int s = socket(AF_INET, SOCK_STREAM, 0);
int index = if_nametoindex( "pdp_ip0");
int suc = setsockopt(s, IPPROTO_IP, IP_BOUND_IF, &index, sizeof(index));
隨后可以使用socket進(jìn)行網(wǎng)絡(luò)連接拓萌，后續(xù)操作本人沒有進(jìn)一步調(diào)研岁钓，但是根據(jù)以上信息一定可以通過特定網(wǎng)卡進(jìn)行網(wǎng)絡(luò)連接
