When the program to connect, has been an error, please leaders see, when the compiler used vs 2017

 
# include "PCH. H" 
#include  
#include 
#include//inet_pton 
# pragma comment (lib, "ws2_32. Lib")//static connection network library 
Int main () 
{
//in a corresponding lib library WSAStartup 
WORD version=MAKEWORD (2, 1); 
WSADATA MSG. 
Int a=WSAStartup (version, & amp; MSG);//the first parameter is specified in a DLL version, the second parameter specifies information about the operation environment of winsock 
If (a!=0) {
STD: : cout & lt; <"Open network library failed" & lt; } 
The else {
//situations successfully 
//create a socket 
The SOCKET num=SOCKET (AF_INET, SOCK_STREAM, 0); 
If (num==INVALID_SOCKET) {
STD: : cout & lt; <"Failed to create a socket & lt;" } 
The else {
STD: : cout & lt; <"Success to create a socket, socket Numbers for" & lt; //client 
//connect to other host 
//1. Create the corresponding AF family agreement, IP address and port structure 
SOCKADDR_IN hello; 
Hello. Sin_family=AF_INET; 
Hello. Sin_port=htons (4484);//by CMD netstat command to view the currently running a program of the port 
//hello. Sin_addr. S_addr=inet_addr (" 127.0.0.1 "); 
//use in vs 2017 inet_pton to IP addresses to be included in the structure 
Inet_pton (AF_INET, "127.0.0.1," (void *) & amp; Hello);//127.0.0.1 here on behalf of the native 
/* this connection is the machine, so just specify the corresponding port number, don't know why not here? */

If (connect (num, (SOCKADDR *) & amp; Hello, sizeof (hello))==0)//returns 0 when the connection is successful, not successful return 1 
{
STD: : cout & lt; <"The connection is successful" & lt; 





If (closesocket (num)==0) 
STD: : cout & lt; <"Disconnected" success & lt; The else 
STD: : cout & lt; } 
The else 
STD: : cout & lt; <"Connection failure" & lt; 
WSACleanup ();//shut down the network library 
} 

} 





} 

*/

CodePudding user response:

The server is normal?
Try a modified version version=MAKEWORD (2, 2);
Before you connect to set breakpoints, view the hello is normal?
What is the error code WSAGetLastError watch?

CodePudding user response:

reference 1st floor zgl7903 response:

server is normal?
Try a modified version version=MAKEWORD (2, 2);
Before you connect to set breakpoints, view the hello is normal?
What is the error code WSAGetLastError watch?

Find the reason, inet_pton the function of the third argument is wrong, should be to (void *) hello. Sin_addr. S_un. S_addr