IOS网络篇4之Socket通信（传递图片和基本数据）

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紧接这一篇

IOS网络篇3之IOS底层网络架构详解

在使用socket进行通信之前我们首先来认识几个东东：

CFReadStreamRef

CFWriteStreamRef

来看看水果公司官方的解释：

CFReadStream provides an interface for reading a byte stream either synchronously or asynchronously. You can create streams that read bytes from a block of memory, a file, or a generic socket。

CFStream是一个输入输出数据流，可以实现和内存、文件、socket之间的数据交互。因此我们这里使用Socket必然要使用这个对象。

再来看看另外两个对象：

NSInputStream

NSOutputStream

NSStream is an abstract class for objects representing streams. Its interface is common to all Cocoa stream classes, including its concrete subclasses NSInputStream and NSOutputStream.

这个对象实现了和底层数流的交互，可以和CFStream实现无阻碍连接。

socket实现网络通信主要由两个方法组成：

- (void)initNetworkCommunication

{

CFReadStreamRef readStream;

CFWriteStreamRef writeStream;

// 建立与服务器的连接，设置ip地址，PORT端口，返回输入输出数据流。

CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"192.168.1.134",PORT, &readStream, &writeStream);

// __bridge_transfer 一般用于将core foundation转化为foundation

_inputStream = (__bridge_transferNSInputStream *)readStream;

_outputStream = (__bridge_transferNSOutputStream

*)writeStream;

// 设置接收设备的委托代理

[_inputStreamsetDelegate:self];

[_outputStreamsetDelegate:self];

// 将数据输入输出流添加到run loop中。

[_inputStreamscheduleInRunLoop:[NSRunLoopcurrentRunLoop]

forMode:NSDefaultRunLoopMode];

[_outputStreamscheduleInRunLoop:[NSRunLoopcurrentRunLoop]

forMode:NSDefaultRunLoopMode];

// 打开输入输出流

[_inputStreamopen];

[_outputStreamopen];

}

// 对各种事件的响应

-(void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {

NSString *event;

switch (streamEvent) {

// 没有事件发生

caseNSStreamEventNone:

event =@"NSStreamEventNone";

break;

// 成功打开流

caseNSStreamEventOpenCompleted:

event = @"NSStreamEventOpenCompleted";

break;

// 数据可读，在读取数据的时候使用

caseNSStreamEventHasBytesAvailable:

event = @"NSStreamEventHasBytesAvailable";

if (flag ==1 && theStream ==_inputStream) {

NSMutableData *input = [[NSMutableDataalloc]init];

uint8_t buffer[1024000];

long len;

// 是否数据可读。如果可读那么执行循环读取。

while([_inputStreamhasBytesAvailable])

{

// 将数据读取到缓冲区并返回数据的长度。

// 查看这个

NSLog(@"buffer=%ld",sizeof(buffer));

len = [_inputStreamread:buffermaxLength:sizeof(buffer)];

NSLog(@"xxxxx=%ld",len);

if (len >0)

{

// 如果数据有效，那么将数据追加到input中。

[inputappendBytes:bufferlength:len];

}

NSLog(@"input length = %d",[inputlength]);

UIImage *image = [UIImageimageWithData:input];

UIImageWriteToSavedPhotosAlbum(image,nil,nil,nil);

// 将Data进行解码转化为字符串。

// NSString *resultstring = [[NSString alloc] initWithData:input encoding:NSUTF8StringEncoding];

// NSLog(@"接收:%@",resultstring);

// _message.text = resultstring;

// NSLog(@"image write swuccess!");

}

break;

// 写入数据流

caseNSStreamEventHasSpaceAvailable:

event = @"NSStreamEventHasSpaceAvailable";

if (flag ==0 && theStream ==_outputStream) {

// 按照NSData *data的形式，传递NSData数据，注意这里传递的数据的长度也是[data length]+1

// 传递的数据类型是[data bytes]

NSString *sendmessage =@"hello郑微serve！!";

// 这里将字符串转化为 nsdata

NSData *data = [[NSDataalloc]initWithData:[sendmessagedataUsingEncoding:NSUTF8StringEncoding]];

[_outputStreamwrite:[databytes]maxLength:[datalength]+1];

[_outputStreamclose];

}

break;

// 读取流发生错误时候调用

caseNSStreamEventErrorOccurred:

event = @"NSStreamEventErrorOccurred";

[selfclose];

break;

// 流结束的时候调用。

caseNSStreamEventEndEncountered:

event = @"NSStreamEventEndEncountered";

NSLog(@"Error:%d:%@",[[theStreamstreamError]code], [[theStreamstreamError]localizedDescription]);

break;

default:

[selfclose];

event =@"Unknown";

break;

}

NSLog(@"event------%@",event);

}

注意这里的数据传输还可以通过下面三个方法来实现：

// 方法1 按照UInt8 buff[] = "Hello Server!";传递数据。传递数据的位数是实际长度＋1.

// 比如这个是13个字节，实际传递的数据长度是14个字节。

//需要写入的数据空间

UInt8 buff[] = "Hello Server!";

[_outputStream write:buff maxLength: strlen((const char*)buff)+1];

//必须关闭输出流否则，服务器端一直读取不会停止，

[_outputStream close];

// ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

// /*

// 方法2 按照NSData *data的形式，传递NSData数据，注意这里传递的数据的长度也是[data length]+1

// 传递的数据类型是[data bytes]

NSString *sendmessage =@"hello郑微serve！!";

// 这里将字符串转化为 nsdata

NSData *data = [[NSDataalloc]initWithData:[sendmessagedataUsingEncoding:NSUTF8StringEncoding]];

[_outputStreamwrite:[databytes]maxLength:[datalength]+1];

[_outputStreamclose];

// */

// ＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

// 方法3 将nsdata转化为UInt8然后再传递

// UInt8 *p = (UInt8*) [data bytes];

// [_outputStream write:p maxLength:[data length]+1];

// 注意带中文的采用NSUTF8StringEncoding中文编码

// 不带中文的采用NSASCIIStringEncoding ascii编码

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