简单的 Iphone 客户端连接到服务器

Question

预先感谢那些查看我的问题的人。我是编程新手，也是 Objective-c 编程新手，我正在创建一个简单的客户端，它将连接到白天服务器并请求时间和日期，然后将其打印到屏幕上，我已经观看并阅读了很多教程现在，我想出了下面的代码，但我有一个问题，我无法读取用户输入的服务器地址的输入，我将使用该服务器地址来连接到服务器，这是我的代码，

我的控制器中的套接字代码。 m 文件

@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

我的连接地址和端口

@implementation iPhoneClientViewController

-(void) connect {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSString *address = [defaults stringForKey:@"Address"]; // this is default one 
    if(!address) address = @"localhost";
    NSLog(@"ADDRESS %@",address);

    [NSStream getStreamsToHostNamed: address port:13 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];
}

我的默认值是

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
   <key>Title</key>
   <string>iPhoneClient</string>
   <key>StringsTable</key>
   <string>Root</string>
   <key>PreferenceSpecifiers</key>
   <array>
    <dict>
      <key>Type</key>
      <string>PSTextFieldSpecifier</string>
      <key>Title</key>
      <string>Server IP</string>
      <key>Key</key>
      <string>Address</string>
      <key>DefaultValue</key>
      <string>localhost</string>
      <key>IsSecure</key>
      <false/>
      <key>KeyboardType</key>
      <string>NumbersAndPunctuation</string>
      <key>AutoCorrectType</key>
      <string>No</string>
    </dict>
   </array>
  </dict>
</plist>

我放了一个我的 ViewController.m 的文本字段

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    NSLog(@"Text Field contents %@",textField.text);
    [textField resignFirstResponder];
    return YES;
}

，当单击按钮时，我放置

- (IBAction)connectCommand:(id)sender {
    // NSString *address = textField.text; // this is gives me error textField  undeclared
    // then i try this one
    NSString *address = text.text;
    if( iStream != nil) return;
    [self connect];
}

然后运行程序，我输入地址，然后单击连接按钮，但它不起作用，它在输出屏幕上给我以下错误，

2011-10-03 17:49:14.903 iPhoneClient[360:b303] Text Field contents 64.90.182.55 
2011-10-03 17:49:16.096 iPhoneClient[360:b303] ADDRESS localhost
2011-10-03 17:49:16.101 iPhoneClient[360:b303] >> : NSStreamEventErrorOccurred
2011-10-03 17:49:16.102 iPhoneClient[360:b303] << : NSStreamEventErrorOccurred

我的事件处理如下所示，

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
{
    NSString *io;
    if (theStream == iStream) io = @">>";
    else io = @"<<";

    NSString *event;
    switch (streamEvent)
    {
        case NSStreamEventNone:
            event = @"NSStreamEventNone - Can not connect to the host!";
            break;
        case NSStreamEventOpenCompleted:
            event = @"NSStreamEventOpenCompleted";
            break;
        case NSStreamEventHasBytesAvailable:
            event = @"NSStreamEventHasBytesAvailable";
            if (theStream == iStream)
            {
                //read data
                uint8_t buffer[1024];
                int len;
                while ([iStream hasBytesAvailable])
                {
                    len = [iStream read:buffer maxLength:sizeof(buffer)];
                    if (len > 0)
                    {
                        NSString *input = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
                        if (nil != input)
                        {
                            //do something with data
                            NSLog(@"%@",input);
                        }
                    }
                }
            }
            break;
        case NSStreamEventHasSpaceAvailable:
            event = @"NSStreamEventHasSpaceAvailable";
            break;
        case NSStreamEventErrorOccurred:
            event = @"NSStreamEventErrorOccurred";
            break;
        case NSStreamEventEndEncountered:
            event = @"NSStreamEventEndEncountered";
            [self disconnect];
            break;
        default:
            event = @"** Unknown";
    }

    NSLog(@"%@ : %@", io, event);
}

任何人都可以帮助我用我的代码？或者建议我一个很好的教程，我可以看到代码示例并了解有关套接字的更多内容。

=================================================== =================================================== =

好吧，因为我是新人，所以不允许回复我自己的帖子，所以我会编辑它，

我想我会选择低级别，是的，处理 xml 有点复杂，所以我只是禁用了这些部分

//NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    //NSString *address = [defaults stringForKey:@"Address"];
    //if(!address) address = @"localhost";]

，并将这段代码

    NSString *address = [text text];
    NSLog(@"ADDRESS %@",address);

现在放在我的我得到的输出屏幕 =

2011-10-03 18:58:57.758 iPhoneClient[424:b303] Text Field contents 64.90.182.55 
2011-10-03 18:58:58.627 iPhoneClient[424:b303] ADDRESS 64.90.182.55 
2011-10-03 18:58:58.685 iPhoneClient[424:b303] >> : NSStreamEventOpenCompleted
2011-10-03 18:58:58.686 iPhoneClient[424:b303] << : NSStreamEventOpenCompleted
2011-10-03 18:58:58.686 iPhoneClient[424:b303] << : NSStreamEventHasSpaceAvailable
2011-10-03 18:58:58.696 iPhoneClient[424:b303] >> : NSStreamEventHasBytesAvailable
2011-10-03 18:58:58.698 iPhoneClient[424:b303] >> : NSStreamEventEndEncountered

我认为它说它已连接但由于我对数据没有做任何事情，它会自行终止，因为我在上面放置了一个运行循环？

现在有人知道如何从服务器获取和打印日期和时间吗？

Answer 1

高级别反馈：

我建议使用字节流与服务器进行通信的级别太低。

相反，请考虑使用 JSON 或 XML 作为更易于管理的格式。通过将其与 RESTful API 相结合，您可以使用来自 iOS 的 HTTP 请求，并以更高效、更便携和更易于管理的方式与您的服务器进行通信。

希望有帮助。

Answer 2

在方法中：

NSString *address = [text text];

当用户按键盘上的 Tab 键返回键时：

-(BOOL)textFieldShouldReturn: (UITextField *)textField {
    NSLog(@"Text Field contents %@",textField.text);
    [textField resignFirstResponder];
    return YES;
}