提前感谢看我问题的人。我新的编程和objective - c编程,我创建一个简单的客户端,连接到一个白天服务器,请求时间和日期然后打印到屏幕上,我现在看到和阅读大量的教程和想出了下面的代码,但我有一个问题我不能读取输入从用户输入服务器地址和我将使用服务器地址,以便连接到服务器
这是我的代码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];
}
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>
我给我的ViewController.m添加了一个文本域
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
NSLog(@"Text Field contents %@",textField.text);
[textField resignFirstResponder];
return YES;
}
当按钮被点击时，我把
- (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];
}
然后我运行程序，我输入地址，然后我点击连接按钮，但它不起作用，它在输出屏幕上给了我以下错误
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
我的事件处理就像下面的
- (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);
}
=====================================================================================================
好吧，因为我是新人，所以不允许回复我自己的帖子，所以我将编辑它
我想我应该用低级别，是的处理XML有点复杂所以我禁用了
部分//NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//NSString *address = [defaults stringForKey:@"Address"];
//if(!address) address = @"localhost";]
，然后把代码改成
NSString *address = [text text];
NSLog(@"ADDRESS %@",address);
现在在我的输出屏幕中，我得到如下=
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
i认为它说它连接，但由于我不做任何数据，它终止自己，因为我把一个运行循环上面?
现在有人知道我如何从服务器获取和打印日期和时间吗?
高层反馈:
我建议使用字节流与服务器通信是一个太低的级别。
相反，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，可移植和可管理的方式与服务器通信。
希望对你有帮助。
in methods:
NSString *address = [text text];
当用户TAB返回键盘上的键时:
-(BOOL)textFieldShouldReturn: (UITextField *)textField {
NSLog(@"Text Field contents %@",textField.text);
[textField resignFirstResponder];
return YES;
}