c++ winsock client cannot connect using textbox for host IP

Question

I cannot get it connect to my server when i use the host IP from my textbox. See my code :

                    char *bufhost;
                int bufhostlen;
                bufhostlen = GetWindowTextLength(hwndTextBox_ip) + 1;
                GetWindowText(hwndTextBox_ip, bufhost, bufhostlen);
                sockaddr_in sin;
                sin.sin_family=AF_INET;
                sin.sin_port=htons(5060);
                sin.sin_addr.s_addr=inet_addr(bufhost);
                connect(sock,(LPSOCKADDR)(&sin),sizeof(sin));

If i use

sin.sin_addr.s_addr=inet_addr("127.0.0.1");

It connects without problem.

I really don't know how to get this work (searched for hours...) Thanks for helping :-)

SOLUTION :

as PermanentGuest told me, i have to allocate memory to my buffer :

                    char *bufhost;
                int bufhostlen;
                bufhostlen = GetWindowTextLength(hwndTextBox_ip) + 1;
                bufhost = (char*) malloc(bufhostlen);
                GetWindowText(hwndTextBox_ip, bufhost, bufhostlen);
                sockaddr_in sin;
                sin.sin_family=AF_INET;
                sin.sin_port=htons(5060);
                sin.sin_addr.s_addr=inet_addr(bufhost);
                connect(sock,(LPSOCKADDR)(&sin),sizeof(sin));

score 1 · Accepted Answer · answered Aug 05 '12 at 19:17

1

You need to allocate memory for bufhost. Unfortunateley the documentation of GetWindowText doesn't mention this explicitly. However for all win32 APIs, this is the common behaviour

answered Aug 05 '12 at 19:17

PermanentGuest

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c++ winsock client cannot connect using textbox for host IP

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