failed to connect with winsock - error 10049 on c - c

Question

Iv'e tried to run server client between 2 computers in my local network in my house.
I failed with error 10049 in the client side. I thought it was something with firewall so I've tried to run it my computer(with threads), but still the same issue.
I'm failing at function "connect" with my output:
"error - connect failed. sockfd is 188, errno is 34, WSA is 10049"
here's my code.
app.c:
#include "client.h"
#include "server.h"
int main()
{
DWORD dwThreadID1, dwThreadID2;
CreateThread(
NULL, // default security attributes
0, // default stack size
(LPTHREAD_START_ROUTINE) apserver,
NULL, // no thread function arguments
0, // default creation flags
&dwThreadID1); // receive thread identifier
CreateThread(
NULL, // default security attributes
0, // default stack size
(LPTHREAD_START_ROUTINE) apClient,
NULL, // no thread function arguments
0, // default creation flags
&dwThreadID2); // receive thread identifier
while(1)
{}
return 0;
}
server.c:
#include "server.h"
int socketBind(int sockfd, int port){
struct sockaddr_in serv_addr;
ZeroMemory((char*) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(port);
if ( bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 ){
// we can check errno for exact ERROR
printf("bind failed with errno %d\n",errno);fflush(NULL);
return ERROR;
}
if ( listen(sockfd, 100) == -1 ){
return ERROR;
}
return 1;
}
DWORD WINAPI apserver(LPVOID lpParam)
{
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
printf ("Error initialising WSA.\n");
return -1;
}
int sockfd; // server's listening socket's descriptor id
int port = 4997;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
while ( sockfd < 0 ){ // ERROR
printf("Listener socket creation failed with:%d, errno is %d\n",sockfd,errno);fflush(NULL);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
}
if ( socketBind(sockfd, port) == ERROR ){
printf("Socket bind failed with errno=%d\n",errno);fflush(NULL);
close(sockfd);
return ERROR;
}
printf("Starting to listen to other USERS!\n");fflush(NULL);
struct sockaddr_in cli_addr;
int clilen = sizeof(cli_addr); // length of address
// accept() returns the socket that will be used for Control Connection with the accepted client
printf("*************Waiting for other USERS************\n");fflush(NULL);
int newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
int readLength;
char command[(128+1)];
while(1)
{
ZeroMemory(command, sizeof(command));
readLength = read(newsockfd, command, 128+1);
if(readLength == 0)
{
continue;
}
if(readLength > 0)
{
printf(" here should be API's func to command %s", command);fflush(NULL);
}
else
{
close(sockfd);
close(newsockfd);
WSACleanup();
printf("Read failed with errno:%d\n",errno);fflush(NULL);
return ERROR;
}
}
close(sockfd);
close(newsockfd);
WSACleanup();
return 1;
}
client.c:
#include "client.h"
int verifyWrite(int sockfd, char* command){
int size = strlen(command);
int i=0, x=0;
for(i=0;i<size;){
x = write(sockfd, command, size);
if(x < 0){
return ERROR;
}
if(x >= 0) {
i += x;
}
}
return 0;
}
int sendToAll(char* message, int sockfd)
{
if ( verifyWrite(sockfd, message) < 0 )
{
printf("error while sending message\n");fflush(NULL);
}
return 0;
}
DWORD WINAPI apClient(LPVOID lpParam)
{
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
printf ("Error initialising WSA.\n");
return -1;
}
int port,sockfd;
struct sockaddr_in serv_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0); //creating control connection
while(sockfd < 0){
printf("error - sockfd = %d\n",sockfd);fflush(NULL);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
}
port = 4997;
serv_addr.sin_addr.s_addr = inet_addr("192.168.x.x");
ZeroMemory((char*)&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
while(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) < 0){
printf("error - connect failed. sockfd is %d, errno is %d, WSA is %d\n",sockfd,errno,WSAGetLastError());fflush(NULL);
}
printf("\n opened connection to %s\n", "192.168.x.x");fflush(NULL);
int i = 0;
while(i< 6)
{
sendToAll("just a message", sockfd);
i++;
}
WSACleanup();
return 0;
}

Answer 1

Windows socket error 10049 is WSAEADDRNOTAVAIL, and if you read about it you will see that
connect, ... when the remote address or port is not valid for a remote computer (for example, address or port 0).
The reason is very simple:
serv_addr.sin_addr.s_addr = inet_addr("192.168.x.x");
ZeroMemory((char*)&serv_addr, sizeof(serv_addr));
You clear the structure after you set the address you want to connect to.