Socket Programming, ME ! ! Members prawn : Encountered a strange brother, please enlighten us. As follows : Struct sockaddr_in servaddr; TheSock = socket (AF_INET, SOCK_STREAM,0); Servaddr.sin_family = AF_INET; Servaddr.sin_port = htons (FPort); Servaddr.sin_addr.s_addr = inet_addr (FIP.c_str ()); Int nRet; If ((nRet = connect (TheSock, (struct sockaddr*) &servaddr, sizeof (servaddr))) "0)     The code should not have any problem, but when the translation system being given as follows : Conversion from `sockaddr * 'to non-scalar type `__CONST_SOCKADDR_ARG' requested.    My translation environment RedHat7.3, please help out! Em16 : : Socket Programming, ME ! ! FIP.c_str () return you what type of Sardinia? First printed! Know it is suggested that similar mistakes do not match! Socket Programming, ME ! ! --> This problem and FIP.c_str () What this is a basic C + +, c if this procedure is used to write (of course, the assumption of no use stl. . . ), So call : Connect (TheSock, (struct sockaddr*) &servaddr, sizeof (servaddr)) is not the problem, connect the man page to see this function is as follows : Int connect (int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen); Sockaddr* const struct in C + + which is not allowed to be forced into the struct sockaddr*. In fact, whether or C + + c is the best way should be : Socklen_t addrlen = sizeof (*servaddr); Connect (TheSock, (const struct sockaddr*) &servaddr, addrlen) [ Closed window ]