iphone socket開發

Q: Given that +getStreamsToHost:port:inputStream:outputStream: is not supported on iPhone OS, how can I create NSStreams for a TCP connection to a named host? A: You can do this by exploiting the toll-free bridge between NSStream and CFStream. UseCFStreamCreatePairWithSocketToHost to create CFStreams to the host, and then cast the resulting CFStreams to NSStreams. Listing 1 shows an example of this. It adds a category to NSStream that implements a replacement for+getStreamsToHost:port:inputStream:outputStream:. Listing 1: A category to creates TCP streams to a named host @interface NSStream (MyAdditions)+ (void)getStreamsToHostNamed:(NSString *)hostName port:(NSInteger)port inputStream:(NSInputStream **)inputStreamPtr outputStream:(NSOutputStream **)outputStreamPtr;@end@implementation NSStream (MyAdditions)+ (void)getStreamsToHostNamed:(NSString *)hostName port:(NSInteger)port inputStream:(NSInputStream **)inputStreamPtr outputStream:(NSOutputStream **)outputStreamPtr{ CFReadStreamRef readStream; CFWriteStreamRef writeStream; assert(hostName != nil); assert( (port > 0) && (port < 65536) ); assert( (inputStreamPtr != NULL) || (outputStreamPtr != NULL) ); readStream = NULL; writeStream = NULL; CFStreamCreatePairWithSocketToHost( NULL, (CFStringRef) hostName, port, ((inputStreamPtr != nil) ? &readStream : NULL), ((outputStreamPtr != nil) ? &writeStream : NULL) ); if (inputStreamPtr != NULL) { *inputStreamPtr = [NSMakeCollectable(readStream) autorelease]; } if (outputStreamPtr != NULL) { *outputStreamPtr = [NSMakeCollectable(writeStream) autorelease]; }}@end