iPhone流编程(CFStream) Hello World

Question

我目前正在尝试从我的iPhone向运行正常服务器(通过iPhone上的telnet测试)的远程计算机发送Hello World。

下面是我的代码：

#import "client.h"

@implementation client

- (client*) client:init {
 self = [super init];
 [self connect];
 return self;
}

- (void)connect {
        CFWriteStreamRef writeStream;
        CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)[NSString stringWithFormat: @"192.168.1.1"], 50007, NULL, &writeStream);
  NSLog(@"Creating and opening NSOutputStream...");
  oStream = (NSOutputStream *)writeStream;
  [oStream setDelegate:self];
  [oStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
  [oStream open];
}

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
    NSLog(@"stream:handleEvent: is invoked...");

    switch(eventCode) {
        case NSStreamEventHasSpaceAvailable:
        {
            if (stream == oStream) {
                NSString * str = [NSString stringWithFormat: @"Hello World"];
                const uint8_t * rawstring =
    (const uint8_t *)[str UTF8String];
                [oStream write:rawstring maxLength:strlen(rawstring)];
                [oStream close];
            }
            break;
        }
    }
}

@end

对于client.h：

#import <UIKit/UIKit.h>


@interface client : NSObject {
 NSOutputStream *oStream;
}

-(void)connect;

@end

最后，在AppDelegate.m中：

- (void)applicationDidFinishLaunching:(UIApplication *)application {    

    // Override point for customization after app launch    
    [window addSubview:viewController.view];
 [window makeKeyAndVisible];
 [client new];
}

有人知道哪里出了问题吗？

Answer 1

您的初始化格式不正确。您创建了一个名为client:的方法，而不是init，该方法接受一个名为init的未标记参数(缺省值为id或int--我想是id，但我现在记不起来了)。由于此方法(客户端)从不调用，因此您的客户端永远不会连接。相反，请将该方法替换为以下内容：

- (id)init
{
  if( (self = [super init]) ) {
   [self connect];
  }
  return self;
}

现在，当您调用[Client new]时，您的客户端实际上将被初始化并调用connect本身。我还稍微重组了它，使其遵循通用的Objective-C/Cocoa初始化模式。