istream和ostream的iphone功能
有人能告诉我在下面的代码中istream和ostream的功能吗?当我从网络中选择代码时,我如何声明istream和ostream?我对代码了解不多istream和ostream的iphone功能,iphone,nsstream,nsinputstream,nsoutputstream,Iphone,Nsstream,Nsinputstream,Nsoutputstream,有人能告诉我在下面的代码中istream和ostream的功能吗?当我从网络中选择代码时,我如何声明istream和ostream?我对代码了解不多 NSString *urlStr = @"192.168.178.26"; if (![urlStr isEqualToString:@""]) { NSURL *website = [NSURL URLWithString:urlStr]; if (!website) { NSLog(@"%@ is not a v
NSString *urlStr = @"192.168.178.26";
if (![urlStr isEqualToString:@""]) {
NSURL *website = [NSURL URLWithString:urlStr];
if (!website) {
NSLog(@"%@ is not a valid URL");
return;
}
NSHost *host = [NSHost hostWithName:[website host]];
[NSStream getStreamsToHost:host port:3258 inputStream:&iStream outputStream:&oStream];
[iStream retain];
[oStream retain];
[iStream setDelegate:self];
[oStream setDelegate:self];
[iStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[iStream open];
[oStream open];
/* ... */
}
根据,iStream应该是NSInputStream*指针,oStream应该是NSOutputStream*。&表示您正在将iStream和oStream的地址传递到-getStreamsToHost:。。。方法这就是在C或Objective-C中通过引用传递的方式。然后,该方法将尝试打开到指定主机的连接,如果成功,将为数据流创建流对象,以将数据流发送到iStream和从该主机的oStream,并将它们返回到这些变量中