使用 TCP 从客户端向服务器发送字节的问题
我的 send() 和 recv() 看起来像这样：
int Send(const char* buffer, int size)
{
cout << "SIZE: " << size << endl;
int offset;
while(offset < size)
{
int n = ::send(getSocket(), buffer + offset, size - offset, 0);
if(n == SOCKET_ERROR)
{
break;
}
offset += n;
if(offset != size)
{
Sleep(1);
}
}
return offset;
}
int Recv(char* buffer, int size)
{
int n = ::recv(getSocket(), buffer, size, 0);
if(n == SOCKET_ERROR)
{
cout << "Error receiving data" << endl;
}
if(n == 0)
{
cout << "Remote host closed connection" << endl;
}
return n;
}
但我的输出显示发送了很多字节，这对我来说似乎很奇怪：
Received from client: 669
Sent to web server: 3990336
所以它应该发送 669 个字节，那么它从哪里得到 3990336 ？这是某种错误还是？
谢谢。
My send() and recv() looks like this:
int Send(const char* buffer, int size)
{
cout << "SIZE: " << size << endl;
int offset;
while(offset < size)
{
int n = ::send(getSocket(), buffer + offset, size - offset, 0);
if(n == SOCKET_ERROR)
{
break;
}
offset += n;
if(offset != size)
{
Sleep(1);
}
}
return offset;
}
int Recv(char* buffer, int size)
{
int n = ::recv(getSocket(), buffer, size, 0);
if(n == SOCKET_ERROR)
{
cout << "Error receiving data" << endl;
}
if(n == 0)
{
cout << "Remote host closed connection" << endl;
}
return n;
}
But my output show kind of many bytes sent that seems strange to me:
Received from client: 669
Sent to web server: 3990336
So it should supose to sent 669 bytes, so from where did it get 3990336 ? It is some kind of error or ?
Thanks.
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您是否注意到
int offset;没有初始化？Did you notice that
int offset;is not initialize ?offset初始化为零。否则它可以是任何随机值。Sleep，因为send调用被阻塞。offsetwith zero. Otherwise it could be any random value.Sleepassendcall is blocking.也许这只是您的（精简的？）示例代码，但您从未真正初始化
offset。它可能具有任何值，例如-5000，并且将导致循环发送5669 字节。Maybe it's just your (stripped down?) example code, but you never actually initialize
offset. It might have any value, e.g. -5000 and will cause the loop to send 5669 bytes.