IOS的网络通信的方法 (转）

公告

ios设备的网络通信的方法，有如下两个大类：

1、使用socket的方式进行通信。

2、使用asynsocket类库进行通信。

两种方法当中，我觉得asynsocket更好，因为是别人已经封装好的类库，比较稳定。但是对于直接使用socket的通信方法我倒是觉得很灵活。因为控制都是自己在做的事情。

先列举集中不同的使用方法：

1、直接使用socket的方式。

以 TCP为利，对于TCP来说，是要区分服务端和客户端的。服务端：通常的方法是服务端启动后监听，是否有客户端连接，如果有连接，则建立与客户端的通信。客户端的方法通常是连接服务端，当连接成功之后，就希望发送数据了。

客户端：

CFSocketContext sockContext ;

CFSocketRef cfsock ;

sockContext.info = self;

sockContext.copyDescription = 0;

cfsock = CFSocketCreate(kCFAllocatorDefault,

PF_INET,

SOCK_STREAM,

IPPROTO_TCP,

kCFSocketConnectCallBack,

MyCallBack,

&sockContext

);

// 这个地方是个关键的地方，就是建立一个ip地址，然后使的客户端可以向服务端发起连接。

NSString *strAddress = @"192.168.1.1";

if (cfsock != nil) {

struct sockaddr_in addr4;

memset(&addr4,0,sizeof(addr4));

addr4.sin_len = sizeof(addr4);

addr4.sin_family = AF_INET;

addr4.sin_port = htons(1230);

addr4.sin_addr.s_addr = inet_addr( [strAddress UTF8String] );

CFDataRef address = CFDataCreate(kCFAllocatorDefault, (UInt8*)&addr4, sizeof(addr4));

CFSocketConnectToAddress(cfsock, address, -1);

}

// 发起连接之后，需要将runloop的过程，也就是消息的过程加入到当前线程当中。这样当有事件发生时，会调用对应的方法。

CFRunLoopRef crun = CFRunLoopGetCurrent();// CFRunLoopGetMain();

CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, cfsock, 0);

CFRunLoopAddSource(crun, source, kCFRunLoopCommonModes);

CFRelease(source);

回调函数：当连接成功之后的处理如下：

static void MyCallBack (

CFSocketRef s,

CFSocketCallBackType callbackType,

CFDataRef address,

const void *data,

void *info

)

{

if (data!=NULL) {

NSLog(@"传输失败!");

}

SocketTestAppDelegate *client = (SocketTestAppDelegate*)info;

[client performSelectoInBackground:@selector(readstream) withObject:nil];

}

-(void) readstream

{

char buffer[1024];

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

while (recv(CFSocketGetNative(cfsock),buffer,sizeof(buffer),0)) {

}

[pool release];

}

// 如果希望直接向服务器写内容的话，采用如下的方法。

-(void) sendstream

{

NSString * stringtosend = @"hello everyone";

const char *data = [stringtosend UTF8String];

send(CFSocketGetNative(cfsock),data,strlen(data)+1,0);

}

服务器端的程序：

CFSocketRef socketserver;

int setupSocket()

{

socketserver =CFSocketCreate(kCFAllocatorDefault,PF_INET,SOCK_STREAM,IPPROTO_TCP,kCFSocketAcceptCallBack,myaccept,NULL);

int optval =1;

setsockopt(CFSocketGetNative(socketserver), SOL_SOCKET, SO_REUSEADDR, (void*)&optval,sizeof(optval));

struct sockaddr_in addr4;

memset(&addr4,0,sizeof(addr4));

addr4.sin_len = sizeof(addr4);

addr4.sin_family = AF_INET;

addr4.sin_port = htons(10);

addr4.sin_addr.s_addr=htonl(INADDR_ANY);

CFDataRef address = CFDataCreate(kCFAllocatorDefault, (UInt8*)&addr4, sizeof(addr4));

CFSocketSetAddress(socketserver, address);

CFRunLoopRef cfRunloop = CFRunLoopGetCurrent();

CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, socketserver, 0);

CFRunLoopAddSource(cfRunloop, source, kCFRunLoopCommonModes);

CFRelease(source);

}

//服务端的socket建立之后，就需要接受client的连接，因此建立连接的回调函数。

static void myaccept (

CFSocketRef s,

CFSocketCallBackType callbackType,

CFDataRef address,

const void *data,

void *info

)

{

if (callbackType == kCFSocketAcceptCallBack) {

// 如果对端连接成功的话，是可以获取对端的名称和socket的。

CFSocketNativeHandle nativesockethandle = *(CFSocketNativeHandle*)data;

uint8_t name[100];

socklen_t namelen = 100;

getpeername(nativesockethandle, (struct sockaddr *)name, &namelen);

//除此以外，更重要的是获取输入流和输出流，

CFReadStreamRef iStream;

CFWriteStreamRef oStream;

// 创建一个可读写的socket连接

CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativesockethandle, &iStream, &oStream);

CFStreamClientContext streamcontext={

0,NULL,NULL,NULL

};

// 注册两种事件！

CFReadStreamSetClient(iStream, kCFStreamEventHasBytesAvailable, readStream, &streamcontext);

CFReadStreamSetClient(iStream, kCFStreamEventCanAcceptBytes, writeStream, &streamcontext);

//加入到循环当中！

CFReadStreamScheduleWithRunLoop(iStream, CFRunLoopGetCurrent(),kCFRunLoopCommonModes);

CFWriteStreamScheduleWithRunLoop(oStream, CFRunLoopGetCurrent(),kCFRunLoopCommonModes);

CFReadStreamOpen(iStream);

CFWriteStreamOpen(oStream);

}

void readStream(CFReadStreamRef stream,CFStreamEventType eventType, void *clientCallBackInfo) {

UInt8 buff[255];

CFReadStreamRead(stream, buff, 255);

printf("received: %s", buff);

}

void writeStream (CFWriteStreamRef stream, CFStreamEventType eventType, void *clientCallBackInfo) {

// outputStream = stream;

   char *str = "nihao";

CFWriteStreamWrite(outputStream, str, strlen(line) + 1);

}

另一种方法是使用NSStream的方式构建客户端，然后发送和接受内容。

-(void)startClient

{

host
 = [

NSHosthostWithAddress:@"192.168.201.24"];//hostWithName:@"www.apple.com"];

[NSStream

getStreamsToHost:host
 port:4242 inputStream:&inStream outputStream:&outStream];

if

((inStream
 ==

nil

)
 || (outStream ==

nil))

{

NSLog(@

"Error:
 Failed to create streams!"

)
 ;

[selfrelease];

}

-
 (

void)stream:(NSStream

*)aStream
 handleEvent:(

NSStreamEvent)eventCode

{

switch

(eventCode)
 {

caseNSStreamEventHasBytesAvailable:

{

NSMutableData

*input
 = [[

NSMutableData

alloc]
 init];

uint8_t
 buffer[1024];

intlen;

while([inStream
 hasBytesAvailable])

{

len
 = [inStream read:buffer maxLength:

sizeof(buffer)];

if

(len
 > 0)

{

[input
 appendBytes:buffer length:len];

}

self

._resultdata
 = input;

self

._resultstring
 = [[

NSString

alloc]
 initWithData:input encoding:

NSUTF8StringEncoding];

[input
 release];

break;

}

caseNSStreamEventEndEncountered:

[selfcloseStream];

break;

caseNSStreamEventHasSpaceAvailable:

caseNSStreamEventErrorOccurred:

{

NSLog(@"Error:%@:%@"

,[[aStream
 streamError] code], [[aStream streamError] localizedDescription]);

}

caseNSStreamEventOpenCompleted:

caseNSStreamEventNone:

default:

break;

}

-(void)closeStream{

[inStream
 close];

[outStream
 close];

[inStream
 removeFromRunLoop:[

NSRunLoop

currentRunLoop]
 forMode:

NSDefaultRunLoopMode];

[outStream
 removeFromRunLoop:[

NSRunLoop

currentRunLoop]
 forMode:

NSDefaultRunLoopMode];

[inStream
 setDelegate:

nil];

[outStream
 setDelegate:

nil];

[inStream
 release];

[outStream
 release];

inStream
 =

nil;

outStream
 =

nil;

}

-(void)openStream{

[inStream
 retain];

[outStream
 retain];

[inStream
 setProperty:

NSStreamSocketSecurityLevelSSLv3forKey:NSStreamSocketSecurityLevelKey];

[outStream
 setProperty:

NSStreamSocketSecurityLevelSSLv3forKey:NSStreamSocketSecurityLevelKey];

NSMutableDictionary

*
 sslSettings;

sslSettings
 = [

NSMutableDictionarydictionaryWithObjectsAndKeys:(id)kCFBooleanFalse,kCFStreamSSLValidatesCertificateChain,kCFBooleanFalse,kCFStreamSSLIsServer,nil];

CFWriteStreamSetProperty((CFWriteStreamRef)outStream,
 kCFStreamPropertySSLSettings, sslSettings);

[inStream
 setDelegate:

self];

[outStream
 setDelegate:

self];

[inStream
 scheduleInRunLoop:[

NSRunLoop

currentRunLoop]
 forMode:

NSDefaultRunLoopMode];

[outStream
 scheduleInRunLoop:[

NSRunLoop

currentRunLoop]
 forMode:

NSDefaultRunLoopMode];

[inStream
 open];

[outStream
 open];

}

-(int

)writeString:
 (

NSString

*)
 string

{

NSData

*messageAsData
 = [string dataUsingEncoding:

NSASCIIStringEncoding];

return

[outStream
 write: (c*****t uint8_t *) [messageAsData bytes] maxLength: [messageAsData length]];

}

-(int

)writeBytes:
 (

char

*)
 buffer length: (unsigned

int

)
 len

{

return

[outStream
 write: (c*****t uint8_t *) buffer maxLength: len];

}

@end

posted on 2012-12-24 11:54 守望远方阅读(441) 评论(0) 编辑收藏举报

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