iOS 简单socket连接
- (void)CreateSocket{
NSString *host = [self.realStreamDict objectForKey:@"StreamSeverIP"];
NSString * StreamServerPort = [self.realStreamDict objectForKey:@"StreamSeverPort"];
// NSString *host = @"172.16.24.223";
//
// NSString * StreamServerPort =@"6123";
if(host.length==0||_isConnectToSocketServer||_haveConnectSocket){
return;
}
_haveConnectSocket = YES;
BOOL socketConnectSuccess = [self connection:host port:StreamServerPort.intValue];
if (socketConnectSuccess ) {
NSLog(@"sock连接成功");
}
else{
[self CreateSocket];
return;
NSLog(@"sock连接失败");
}
//选择性发送头校验
NSData * headData = [self sendHeaderInformation];
if (headData.length>0) {
send(self.clientSocket,headData.bytes,headData.length, 0);
}
uint8_t buffer[1024];
// 从服务器接收过来的数据
ssize_t recvLen = recv(self.clientSocket, buffer, sizeof(buffer), 0);
// 按照服务器返回的长度,从 buffer 中,读取二进制数据,建立 NSData 对象
if(recvLen>0){
NSData *data = [NSData dataWithBytes:buffer length:recvLen];
NSString *info = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if ([info hasPrefix:@"TXEH"]) {
self.isConnectToSocketServer = YES;
NSLog(@"连接socket 成功。。。");
}
else{
close(self.clientSocket);
[self CreateSocket];
}
}
}
// MARK: Socket
- (BOOL)connection:(NSString *)hostText port:(int)port {
// socket
/**
参数
domain: 协议域,AF_INET(IPV4的网络开发)
type: Socket 类型,SOCK_STREAM(TCP)/SOCK_DGRAM(UDP,报文)
protocol: IPPROTO_TCP,协议,如果输入0,可以根据第二个参数,自动选择协议
返回值
socket,如果 > 0 就表示成功
*/
self.clientSocket = socket(AF_INET, SOCK_STREAM, 0);
if (self.clientSocket > 0) {
NSLog(@"Socket Create success %d", self.clientSocket);
} else {
NSLog(@"Socket Create error");
}
//connection 连接到“服务器”
/**
参数
1> 客户端socket
2> 指向数据结构sockaddr的指针,其中包括目的端口和IP地址
服务器的"结构体"地址,C语言没有对象
3> 结构体数据长度
返回值
0 成功/其他 错误代号,非0即真
*/
struct sockaddr_in serverAddress;
// IPV4 - 协议
serverAddress.sin_family = AF_INET;
// inet_addr函数可以把ip地址转换成一个整数
serverAddress.sin_addr.s_addr = inet_addr(hostText.UTF8String);
// 端口小端存储
serverAddress.sin_port = htons(port);
int result = connect(self.clientSocket, (const struct sockaddr *)&serverAddress, sizeof(serverAddress));
int nNetTimeout=1000;//1秒
setsockopt(self.clientSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&nNetTimeout, sizeof(int));
// 如果连接成功返回 YES 33
return (result == 0);
}