client messages don't arrive to server in tcp winsock - c

Question

I have server client application.
When I'm sending messages in a row(without scanf in the code below), it's seems the server doesn't get them(doesn't print).
if I wait a little bit(with the scanf in the code below) and then send the next message the server works fine and prints all messages.
what's the problem?
how can I fix it, cause I want to do more with the message(not just to print it) that arrived to the server.
in my client code(where server prints nothing)
char message[(100)] = {0};
int x = rand();
while(i < 3)
{
printf(" I send %d\n", x);fflush(NULL);
sprintf(message, "%d",x);
if( send(mainSockfd, message,strlen(message),0) == -1)
{
printf("ERRRRRORRRR\n");fflush(NULL);
}
i++;
x = rand() % 100;
}
in my client code(when server prints the messages)
char message[(100)] = {0};
int x = rand();
while(i < 3)
{
printf(" I send %d\n", x);fflush(NULL);
sprintf(message, "%d",x);
if( send(mainSockfd, message,strlen(message),0) == -1)
{
printf("ERRRRRORRRR\n");fflush(NULL);
}
i++;
x = rand() % 100;
scanf("%d",&x); // this is the only change
}
in my server code
char command[(100+1)] = {0};
while(1)
{
readLength = recv(sockfd, command, 100+1,0);
if(readLength > 0)
{
printf("arrived = %s,\n",command);fflush(NULL);
ZeroMemory(command, sizeof(command));
}
else if( readLength == 0)
{
break;
}
else if ( readLength < 0 ){
if(GetLastError() == 10035)
{
continue;
}
if(GetLastError() == 10057 || GetLastError() == 10054)
{
break;
}
continue;
}
}

Answer 1

As you seem to be transferring 0-terminated "strings" without the 0 termination, you should read one char less then the read buffer provides to always have the read buffer being 0-terminated, as if you try to printf a non 0-terminated "string" you provoke undefined behaviour.
So change this
readLength = recv(sockfd, command, 100+1,0);
to become this
readLength = recv(sockfd, command, 100,0);