IOS的网络通信的方法

最新推荐文章于 2023-11-26 16:59:26 发布

原创最新推荐文章于 2023-11-26 16:59:26 发布 · 3.6k 阅读

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CC 4.0 BY-SA版权

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
 = [NSHost

hostWithAddress:@"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!")
 ;

        [self

release];

}

}

-
 (void)stream:(NSStream

*)aStream handleEvent:(NSStreamEvent)eventCode

{

    switch(eventCode)
 {

        case

NSStreamEventHasBytesAvailable:

{

            NSMutableData

*input = [[NSMutableData

alloc] init];

            uint8_t
 buffer[1024];

            int

len;

            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;

}

        case

NSStreamEventEndEncountered:

            [self

closeStream];

            break;

        case

NSStreamEventHasSpaceAvailable:

        case

NSStreamEventErrorOccurred:

{

            NSLog(@"Error:%@:%@",[[aStream
 streamError] code], [[aStream streamError] localizedDescription]);

}

        case

NSStreamEventOpenCompleted:

        case

NSStreamEventNone:

        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:NSStreamSocketSecurityLevelSSLv3

forKey:NSStreamSocketSecurityLevelKey];

    [outStream
 setProperty:NSStreamSocketSecurityLevelSSLv3

forKey:NSStreamSocketSecurityLevelKey];

    NSMutableDictionary

* sslSettings;

    sslSettings
 = [NSMutableDictionary

dictionaryWithObjectsAndKeys:(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