跨平台套接字发送，在Windows上的linux const char *上缓冲const void *，最好的处理方式？

Question

I am porting a program which uses posix (BSD) sockets to windows (using winsock). This is going ok, but I have come up against an issue with send (I think recv might have the same issue). On Linux this function has the signature (see here ):

ssize_t send(int sockfd, const void *buf, size_t len, int flags);

on windows it is (see here ):

int send(
  _In_       SOCKET s,
  _In_ const char   *buf,
  _In_       int    len,
  _In_       int    flags
);

The first place I have a problem is in a destructor like this:

ExtSocketHandler::~ExtSocketHandler(void)
{
    if (pUS->GetSock() >= 0) {
        uint8_t u = ES_ABORT;

        // ignore result
        (void)send(pUS->GetSock(), (void *)&u, sizeof(u), send_flags);
    }
    SAFEDELETE(pUS);
}

where the line

(void)send(pUS->GetSock(), (void *)&u, sizeof(u), send_flags);

results in a compiler error on windows as void* cannot be cast to const char* .

Now I suppose I can wrap all calls to send in an #ifdef for windows, but is this the best way to handle this? Is there a more elegant way? There are quite a few calls to send and recv to deal with.

Answer 1

将其强制转换为const char * ，应在两个平台上均进行编译