[英]C winsock function to send all message data
I'm writing a server in c
using WSA that will handle multiple clients. 我正在使用WSA用
c
编写服务器,该服务器将处理多个客户端。 The protocol is something I defined on my own, and the part I'm having trouble with is how to make sure the whole message is actually being sent to the client. 该协议是我自己定义的,而我遇到的问题是如何确保将整个消息实际发送给客户端。
I send
my message once, and than I check how many bytes where actually transferred. 我
send
一次消息,然后检查实际传输的字节数。 Then, if not, I send
again, and as the length of the data that I will now send I use unsentBytes
(see in code). 然后,如果没有,我
send
再次send
,并且由于现在发送的数据长度,我使用了unsentBytes
(请参见代码)。 My problem is that when I try to send the extra bytes that weren't sent, I am currently sending again the entire message. 我的问题是,当我尝试发送未发送的额外字节时,我目前正在再次发送整个消息。 How can I send only the remaining part of the message?
如何仅发送邮件的其余部分?
I know I can send only 1 char at a time, and stop recieving on the client side when I get to the end of the message, but I think I can do it like this as well and that it's better. 我知道我一次只能发送1个字符,并且在到达消息末尾时不再在客户端接收消息,但是我想我也可以这样做,而且更好。
Is this the right logic to use? 这是使用正确的逻辑吗?
int send_msg(SOCKET s, char *msg, int msg_len)
{
int unsentBytes = msg_len;
int bytesResult = send(s, msg, msg_len, SEND_FLAGS);
unsentBytes -= bytesResult;
while (unsentBytes != 0)
{
bytesResult = send(s, msg, unsentBytes, SEND_FLAGS); // ### msg is the problem
unsentBytes -= bytesResult;
}
}
Here's working code from one of my own projects. 这是我自己的项目之一的工作代码。 Note
data + count
to offset into the data. 注释
data + count
以偏移到数据中。
int sendall(int sd, char *data, int length) {
int count = 0;
while (count < length) {
int n = send(sd, data + count, length, 0);
if (n == -1) {
return -1;
}
count += n;
length -= n;
}
return 0;
}
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