本文以及相关的系列文章是我总结的iOS网络开发方面的知识点，本文是第二篇，主要分析了Cocoa Streams中的几个重要类
Cocoa Streams实际上是Objective-C对CFNetwork的简单封装，主要包括了三个类:NSStream, NSInputStream, and NSOutputStream。本部分的接口接口比較简单，使用方法一目了然。
我在这里就仅仅列出接口，方便查阅。
对CFNnework不明确的看IOS研究之网络编程(一)-CFNetwork使用具体解释
NSStream接口例如以下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
@interface
NSStream :
NSObject
- (void)open;
-
(void)close;
-
(id
<NSStreamDelegate>)delegate;
- (void)setDelegate:(id
<NSStreamDelegate>)delegate;
// By default, a stream is its own delegate, and subclassers of NSInputStream and NSOutputStream must maintain this contract. [someStream
setDelegate:nil] must restore this behavior. As usual, delegates are not retained.
-
(id)propertyForKey:(NSString *)key;
- (BOOL)setProperty:(id)property
forKey:(NSString *)key;
- (void)scheduleInRunLoop:(NSRunLoop
*)aRunLoop forMode:(NSString *)mode;
-
(void)removeFromRunLoop:(NSRunLoop *)aRunLoop
forMode:(NSString *)mode;
-
(NSStreamStatus)streamStatus;
- (NSError *)streamError;
@end
@protocol
NSStreamDelegate
<NSObject>
@optional
-
(void)stream:(NSStream *)aStream
handleEvent:(NSStreamEvent)eventCode;
@end
#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))//不能在ios上使用
@interface
NSStream (NSSocketStreamCreationExtensions)
+ (void)getStreamsToHost:(NSHost
*)host port:(NSInteger)port
inputStream:(NSInputStream **)inputStream
outputStream:(NSOutputStream **)outputStream;
@end
#endif
|
NSInputStream和NSOutputStream都是继承NSStream，接口例如以下
|
|
@interface
NSInputStream
: NSStream
- (NSInteger)read:(uint8_t
*)buffer maxLength:(NSUInteger)len;
-
(BOOL)getBuffer:(uint8_t **)buffer
length:(NSUInteger *)len;
- (BOOL)hasBytesAvailable;
@end
@interface
NSOutputStream
: NSStream
- (NSInteger)write:(const
uint8_t *)buffer
maxLength:(NSUInteger)len;
-
(BOOL)hasSpaceAvailable;
@end
|
但这里getStreamsToHost方法,在iOS上不可用。那么在iOS上改怎样初始化NSStream呢？这事实上是iOS的一个小bug。苹果已经给出了答案，须要我们自己为NSStream加入一个类目: