Cocoa-Touch框架用于与TCP套接字通信？

Question

我有一个守护进程运行在锁定在TCP/IP端口上的服务器上。我正在寻找目前是否有任何支持iPhone/Cocoa-touch框架的框架，这些框架提供了一个很好的OO包装器，用于通过IP套接字与守护进程对话。我需要能够用命令交互地查询守护进程并检索回信息。

如果这样的任务没有任何面向对象的包装器，那么下一个最好的选择是什么？

Answer 1

http://code.google.com/p/cocoaasyncsocket/

这就是你想要的。

Answer 2

下面是来自前面提到的AsyncSocket代码的一些示例代码，我将其修改为一个名为SocketCommunicationManager的类。

需要注意的几件事：

• 我们的消息是用换行符(\n)分隔的，所以当从套接字读取数据时，我必须确保使用来自AsyncSocket类的正确常量(在我们的例子中是LFData)。AsyncSocket还提供CRLFData、CRData和ZeroData作为预定义的消息分隔符。
• I将SocketCommunicationManager设置为在接收到前一条消息并对其执行操作后，始终等待传入的消息。为此，我使用了(void)readDataToData:(NSData *)data withTimeout:(NSTimeInterval)timeout tag:(long)tag方法。此方法将等待，直到数据写入套接字，向上读取，直到指定的分隔符，然后调用委托方法(void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag;
• The SocketCommunicationManager使用NSNotificationCenter发布从套接字接收的任何消息。这些消息被命名为kNotification，并且消息使用key.
• Everything从套接字读取的NSData对象包装到userInfo字典中，因此您必须在收到数据后对其进行解码。

代码如下：

#import <Foundation/Foundation.h>

extern NSString * const kNotification;
extern NSString * const kNotificationMessage;

@class AsyncSocket;

@interface SocketCommunicationManager : NSObject {
    AsyncSocket *socket;
    BOOL isRunning;
    NSNotificationCenter* notificationCenter;
}

@property (readwrite, assign) BOOL isRunning;

- (void)connectToHost:(NSString *)hostName onPort:(int)port;
- (void)sendMessage:(NSString *)message;
- (void)disconnect;

@end


#import "SocketCommunicationManager.h"
#import "AsyncSocket.h"

NSString * const kNotification = @"kNotification";
NSString * const kNotificationMessage = @"kNotificationMessage";

@implementation SocketCommunicationManager

@synthesize isRunning;

- (id) init {
    if (!(self = [super init]))
        return nil;

    socket = [[AsyncSocket alloc] initWithDelegate:self];
    [self setIsRunning:NO];
    notificationCenter = [NSNotificationCenter defaultCenter];

    return self;
}

- (void)connectToHost:(NSString *)hostName onPort:(int)port {
    if (![self isRunning]) {
        if (port < 0 || port > 65535)
            port = 0;

        NSError *error = nil;
        if (![socket connectToHost:hostName onPort:port error:&error]) {
            NSLog(@"Error connecting to server: %@", error);
            return;
        }

        [self setIsRunning:YES];
    } else {
        [socket disconnect];
        [self setIsRunning:false];
    }
}

- (void)disconnect {
    [socket disconnect];
}

- (void)dealloc {
    [super dealloc];
    [socket disconnect];
    [socket dealloc];
}

- (void)sendMessage:(NSString *)message {
    NSString *terminatedMessage = [message stringByAppendingString:@"\r\n"];
    NSData *terminatedMessageData = [terminatedMessage dataUsingEncoding:NSASCIIStringEncoding];
    [socket writeData:terminatedMessageData withTimeout:-1 tag:0];
}

#pragma mark AsyncSocket Delegate

- (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port {
    NSLog(@"Connected to server %@:%hu", host, port);
    [sock readDataToData:[AsyncSocket LFData] withTimeout:-1 tag:0];
}

- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    NSData *truncatedData = [data subdataWithRange:NSMakeRange(0, [data length] - 1)];
    NSString *message = [[[NSString alloc] initWithData:truncatedData encoding:NSASCIIStringEncoding] autorelease];

    if (message)
        NSLog(@"%@", message);
    else
        NSLog(@"Error converting received data into UTF-8 String");

    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:message forKey:kNotificationMessage];
    [notificationCenter postNotificationName:kNotification object:self userInfo:userInfo];

    [sock readDataToData:[AsyncSocket LFData] withTimeout:-1 tag:0];
}

- (void)onSocket:(AsyncSocket *)sock didWriteDataWithTag:(long)tag {
    [sock readDataToData:[AsyncSocket LFData] withTimeout:-1 tag:0];
}

- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err {
    NSLog(@"Client Disconnected: %@:%hu", [sock connectedHost], [sock connectedPort]);
}


@end

Answer 3

粗略地说，向上堆栈你有：

• BSD sockets
• CFSocket
• CFReadStream/CFWriteStream/NSInputStream/NSOutputStream
• CFHTTPStream
• NSURLConnection

听起来您需要CFSocket，或者可能需要CFStream。