最近在做项目时，用到socket，推送行情数据，达到数据实时更新的目的。为了节约时间和成本，便使用轮子CocoaAsyncSocket框架,采用TCP连接进行数据传输。和后台约定采用自定义协议，采用byte方式传输，数据格式如下：
后台定义的socket包格式如下：
根据后台的要求，必须使用byte进行数据传输，所以必须对int和NSString转换成byte(字节)，最后把byte转换成NSData进行拼接，使用socket传给后台，下面是核心实现代码：
- (void)connectSocket
{
//判断是否登录
if (![XBUserInfo manage].sessionKey) {
return;
}
NSString *host = @"socket地址";
UInt32 port = 端口号;
//创建GCDAsyncSocket
NSError *error = nil;
[self.socket connectToHost:host onPort:port error:&error];
if (error != nil) {
NSLog(@"%@",error);
}
//初始化，和服务器建立连接
SignedByte protocolByte = 0x02;//协议编号
SignedByte stateCodebyte = 0x01;//状态码
//登录data
NSDictionary *dict = @{@"token":[XBUserInfo manage].sessionKey,@"deviceFlag":@(1)};
//发送登录的byte数据包
[self sendMsgWithProtocolByte:protocolByte stateCodebyte:stateCodebyte content:dict];
}
- (void)sendMsgWithProtocolByte:(SignedByte)protocolByte stateCodebyte:(SignedByte)stateCodebyte content:(id)content
{
//协议编号
NSData *protocolData = [NSData oneByteToData:protocolByte];//自定义的字节转data方法
//状态码
NSData * stateCodebyteData = [NSData oneByteToData:stateCodebyte];//自定义的字节转data方法
NSData *loginbyteData;
if ([content isKindOfClass:[NSDictionary class]]) {//协议编号为登录的data
NSDictionary *dict = (NSDictionary *)content;
NSString *loginStr = [NSString dictionaryToJson:dict];
NSData *loginData = [loginStr dataUsingEncoding:NSUTF8StringEncoding];
SignedByte *loginbyte = (SignedByte *)[loginData bytes];
loginbyteData = [NSData dataWithBytes:loginbyte length:loginData.length];
}else if ([content isKindOfClass:[NSString class]]){//协议编号为心跳包的data
NSString *loginStr = (NSString *)content;
NSData *loginData = [loginStr dataUsingEncoding:NSUTF8StringEncoding];
SignedByte *loginbyte = (SignedByte *)[loginData bytes];
loginbyteData = [NSData dataWithBytes:loginbyte length:loginData.length];
NSLog(@"loginStr------------------------------%lu",(unsigned long)loginStr.length);
}
//消息长度
int len =(int)loginbyteData.length;
NSData *lengthData = [NSData intToByte:len];//自定义的int转data方法
NSMutableData *data = [NSMutableData data];
[data appendData:protocolData];//协议编号
[data appendData:stateCodebyteData];//状态码
[data appendData:lengthData];//消息长度
[data appendData:loginbyteData];//内容
[self.socket writeData:data withTimeout:-1 tag:111];
[self.socket readDataWithTimeout:-1 tag:101];
}
#pragma mark socket delegate
-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
NSLog(@"====>连接成功");
[self threadStart];
[self.socket readDataWithTimeout:-1 tag:101];
}
-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
NSLog(@"====>断开连接");
[self connectSocket];
[self.socket readDataWithTimeout:-1 tag:101];
}
-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag{
NSLog(@"====>写入成功,是否连接失败:====>%d",self.socket.isDisconnected);
[self.socket readDataWithTimeout:-1 tag:tag];
}
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
NSString *receiverStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"收到的数据：------------------%@",receiverStr);
[self.socket readDataWithTimeout:-1 tag:tag];
}
//心跳包发送
- (void)threadStart
{
if (!_connectTimer) {
self.connectTimer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(heartBeat) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer: self.connectTimer forMode:NSDefaultRunLoopMode];
}
}
- (void)heartBeat
{
NSLog(@"~~~开始心跳了~~~");
SignedByte protocolByte = 0x01;//协议编号为心跳包
SignedByte stateCodebyte = 0x01;//状态码
[self sendMsgWithProtocolByte:protocolByte stateCodebyte:stateCodebyte content:@""];
}
遇到的最大的坑：声明Byte类型时，应和后台保持一持，这里后台使用的是SignedByte(有符号的字节类型)。数据类型不一样，会导致发生内容不正确，就不能接收到后台发来的数据。
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作者：码农甲乙丙
来源：CSDN
原文：https://blog.csdn.net/u012852597/article/details/81951592
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