套接字绑定不会返回int [英] socket binding won't return an int
问题描述
我的程式码片段如下:
int descriptor = socket(AF_INET, SOCK_STREAM, 0);
if(descriptor < 0){
cerr << "Error establishing socket connection." << endl;
return -1;
}
int port = 3400;
struct sockaddr_in address;
char buffer[140];
address.sin_family = AF_INET;
address.sin_addr.s_addr = htons(INADDR_ANY);
address.sin_port = htons(port);
int size = sizeof(address);
if(bind(descriptor,(struct sockaddr*)&address,size) < 0){
cerr << "Error binding socket." << endl;
}
cout << "Waiting for connection on " << INADDR_ANY << " on port " << port << ends;
每当我尝试编译这个,我得到以下错误:
whenever I try compiling this, I get the following error:
error: invalid operands to binary expression
('__bind<int &, sockaddr *, int &>' and 'int')
if(bind(descriptor,(struct sockaddr*)&address,size) < 0){
有人知道这是什么意思吗? bind()
应该返回一个整数,我想。我的导入如下所示:
Does anybody know what this could mean? bind()
is supposed to return an integer or so I thought. My imports look like this:
#include <iostream>
#include <string.h>
#include <string>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
using namespace std;
$ b
谢谢!
Thanks!
推荐答案
使用namespace std;
结合太多的头标包含可能是这里的罪魁祸首 - 有一个原因为什么它在这里重复一遍又一遍 不使用它。通过这样做,编译器看到 bind
,并认为你的意思是 std :: bind
从 ; functions>
,而不是 :: bind
。所以要么做正确的事情,并审查,如果你真的需要包括所有这些头,摆脱使用声明,或使用 :: bind
( em>:或两者 - 使用 ::
来表示要使用全局命名空间中的一些标准API函数并不好)
using namespace std;
combined with too much header inclusions is likely the culprit here - there's a reason why it has been repeated over and over again here on SO not to use it. By doing that, the compiler sees bind
and thinks you mean std::bind
from <functional>
, not ::bind
for sockets. So either do the right thing and review if you really need to include all those headers and get rid of that using declaration, or use ::bind
(edit: or both - it's not bad to use ::
to indicate you want to use some standard API function from the global namespace)
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