WINSOCK transmission in C++ loop -

i running server client winsock software transmit data in loop client server. there no problem in first transmission , perfect. second transmission , on corrupted , don't know if keep alive or else. spent 2 days trying figure out.

server side

#include"stdafx.h" #include <stdio.h> #include <stdlib.h> #include <winsock2.h> #include<windows.h> #include <time.h> #include"iostream" #include"string" #define maxline 1000 int main() {     // initialize winsock     wsadata wsadata;     std::string message;     int iresult = wsastartup(makeword(2, 2), &wsadata);     if (iresult != no_error)         printf("server: error @ wsastartup().\n");     // create socket listening incoming connection requests.     socket socklisten;     socklisten = socket(af_inet, sock_stream, 0);     if (socklisten == invalid_socket)     {         printf("server: error @ socket(): %ld\n", wsagetlasterror());         wsacleanup();         return 0;     }     // sockaddr_in structure specifies address family,     // ip address, , port socket being bound.     struct sockaddr_in servaddr;     memset(&servaddr, 0, sizeof (servaddr));     servaddr.sin_family = af_inet;     servaddr.sin_addr.s_addr = htonl(inaddr_any);     servaddr.sin_port = htons(5000); /* daytime server */     if (bind(socklisten, (sockaddr*)&servaddr, sizeof(servaddr)) == socket_error)     {         printf("server: bind() failed.\n");         closesocket(socklisten);         return 0;     }     // listen incoming connection requests on created socket     if (listen(socklisten, 1) == socket_error)         printf("server: listen(): error listening on socket.\n");     printf("server: i'm listening on socket, waiting connection...\n");      socket sockconn;      char recvbuff[maxline];      while (1)     {         sockconn = accept(socklisten, null, null);          recv(sockconn, recvbuff, maxline, 0);         message = recvbuff;         printf("%s \n", message);         std::cout << wsagetlasterror();         sleep(100);         memset(recvbuff, 0, maxline * (sizeof recvbuff[0]));      }     wsacleanup();      return 0; } 

client side

#include"stdafx.h" #include <stdio.h> #include <stdlib.h> #include <winsock2.h> #include<windows.h> #include <time.h> #include"iostream" #define maxline 1000 int main() {     // initialize winsock     wsadata wsadata;     int iresult = wsastartup(makeword(2, 2), &wsadata);     if (iresult != no_error)         printf("client: error @ wsastartup().\n");     // create socket connect server.     socket sockclient;     sockclient = socket(af_inet, sock_stream, 0);     if (sockclient == invalid_socket)     {         printf("client: error @ socket(): %ld\n", wsagetlasterror());         wsacleanup();         return 0;     }     // sockaddr_in structure specifies address family,     // ip address, , port socket being bound.     struct sockaddr_in servaddr;     char servhost[16];     memset(&servaddr, 0, sizeof (servaddr));     printf("enter host ip: ");     scanf("%s", servhost);     servaddr.sin_family = af_inet;     servaddr.sin_addr.s_addr = inet_addr(servhost);     servaddr.sin_port = htons(5000); /* daytime server */     // connect server.     if (connect(sockclient, (sockaddr*)&servaddr, sizeof(servaddr)) == socket_error)     {         printf("client: connect() - failed connect.\n");         wsacleanup();         return 0;     }     char buff[maxline];      // read data server , display     connect(sockclient, (sockaddr*)&servaddr, sizeof(servaddr));      (int x = 0; x < 100; x++)     {      sprintf(buff, "transmission number  %d",x);     send(sockclient, buff, strlen(buff), 0);     memset(buff, 0, maxline * (sizeof buff[0]));     sleep(3000);      }      closesocket(sockclient);     wsacleanup();     closesocket(sockclient);       return 0; } 

the thing don't need loop

sockconn = accept(socklisten, null, null); 

just put before server loop solved , problem solved not sure why