在 iOS CFSocket 中处理回调函数的方式如下
void receiveData(CFSocketRef s,
CFSocketCallBackType type,
CFDataRef address,
const void *data,
void *info)
{
}
int main ()
{
CFSocketRef s = CFSocketCreate(NULL, PF_INET,
SOCK_STREAM, IPPROTO_TCP,
kCFSocketDataCallBack,
receiveData,
NULL);
struct sockaddr_in sin;
struct hostent *host;
host = gethostbyname("localhost");
memset(&sin, 0, sizeof(sin));
memcpy(&(sin.sin_addr), host->h_addr,host->h_length);
sin.sin_family = AF_INET;
sin.sin_port = htons(888);
CFDataRef address, data;
UInt8 message[] = "Hello world";
CFRunLoopSourceRef source;
address = CFDataCreate(NULL, (UInt8 *)&sin, sizeof(sin));
data = CFDataCreate(NULL, message, sizeof(message));
CFSocketConnectToAddress(s, address, 0);
CFSocketSendData(s, NULL, data, 0);
}
在 CFSocket 中,当我们执行 CFSocketCreate 时,我们将回调函数放在 SocketCreate 函数中。
但是对于 C 代码,Socket 和从 Socket 读取如下。
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
我不知道如何在 C 代码中实现回调读取函数。每次有东西进入缓冲区时都会执行回调函数。