Implementation of the socket file transfer function

Service side:

#include  <stdio.h> #include  <winsock2.h> #pragma  comment  (lib,  "Ws2_32.lib" )   //load  ws2_32.dll   #define &NBSP;BUF_SIZE&NBSP;1024&NBSP;&NBSP;INT&NBSP;MAIN (int  argc, char *argv[] {    //First check if the file exists     char * filename =  "Beyond.mp3";//File name     file *fp = fopen (filename,  "RB");//Open file in binary mode     if (fp == null)     {         printf ("cannot open file, press any key to  Exit!\n ");         system (" Pause ");         exit (0);     }         //initialization   Dll    wsadata wsadata;    wsastartup ( MAKEWORD (2,&NBSP;2),  &wsadata);        //Create Socket     socket servsock = socket ( PF_INET,&NBSP;SOCK_STREAM,&NBSP;IPPROTO_TCP);     if (Servsock == invalid_socket)     {        printf ("Failed socket (). \ n");         wsacleanup ();         return 0;    }       //binding Sockets      struct sockaddr_in sockaddr;    memset (&sockaddr, 0, sizeof ( SOCKADDR))   //each byte is filled with 0     sockAddr.sin_family = PF_INET;   Use IPV4 address     sockaddr.sin_addr.s_addr = inet_addr ("127.0.0.1");   // Specific IP address     sockaddr.sin_port = htons (1234);   //Port      if (Bind (servsock,  (sockaddr*) &sockaddr, sizeof (sockaddr))  == socket_error)     {         printf ("Failed bind (). \ n");         wsacleanup ();        return 0;     }       //into the Listening state     listen (servSock,         //loop receive client request     int nSize =  sizeof (SOCKADDR);     char buffer[buf_size] = {0};//Buffer       SOCKADDR clntAddr;    SOCKET clntSock;            for (;;)     {        clntsock = accept (ServSock,   (sockaddr*) &clntaddr, &nsize);        &nBsp;if (Clntsock == invalid_socket)         {             printf ("failed accept (). \ n");             continue;         }            int nCount;         while (Ncount = fread (buffer, 1, buf_size,  FP)  > 0)         {             send (clntsock, buffer, ncount, 0);//cycle data until end of file           }        shutdown ( Clntsock, sd_send)///file read, disconnect the output stream, send fin packets to the client                    recv (clntsock, buffer, buf_size, 0);//blocking, waiting for the client to receive the completion                              memset (buffer, 0, buf_size);//Set Buffer                   fclose (FP);         closesocket (clntsock);     }       //Close socket      closesocket (servsock);        //termination  DLL  use      wsacleanup ();         system ("Pause");     return 0;}

Client:

#include  <stdio.h> #include  <stdlib.h> #include  <winsock2.h> #pragma   Comment (lib,  "ws2_32.lib")   #define  buf_size 1024  int main (INT&NBSP;ARGC,  char *agrv[] {    //Enter the filename first to see if the file can be created successfully     char filename [100] = {0}; //filename     printf ("input filename to save: " );     gets (filename);     file *fp = fopen (filename,   "WB");//open (Create) file in binary mode     if (fp == null)     {         printf ("Cannot open file, press any key  to exit!\n ");         system (" Pause ");         exit (0);    }         //Initialize dll    Wsadata wsadata;    wsastartup (Makeword (2,2),  &wsadata);           //Create Socket     socket sock = socket ( PF_INET,&NBSP;SOCK_STREAM,&NBSP;IPPROTO_TCP);     if (Sock == invalid_socket)     {        printf ("Failed socket (). \ n");         wsacleanup ();         return 0;    }           // Initiating a request to the server     struct sockaddr_in sockaddr;    memset (& Sockaddr, 0, sizeof (sockaddr))  //each byte is filled with 0     sockaddr.sin_family = &NBSP;PF_INET;&NBSP;&NBSP;&NBSP;&NBSP;SOCKADDR.SIN_ADDR.S_ADDR&NBSP;=&NBSP;INET_ADDR ("127.0.0.1");     sockaddr.sin_port&nBsp;= htons (1234);     if (Connect (sock,  (sockaddr*) &sockaddr, sizeof ( SOCKADDR)  == -1)     {        printf (" Failed connect (). \ n ");         wsacleanup ();         return 0;    }            //Loop accepts data and knows file transfer is complete      char buffer[buf_size] =  {0}; //file buffer      int ncount;    while (nCount &NBSP;=&NBSP;RECV (sock, buffer, buf_size, 0))  > 0)     {         fwrite (BUFFER,&NBSP;NCOUNT,&NBSP;1,&NBSP;FP);     }    puts ("file transfer success!\n");            &nbsP;memset (buffer, 0, buf_size);//Reset Buffer                fclose (FP);     closesocket (sock);            //termination using Dll    wsacleanup ();         system ("pause");     return 0; }

Implementation of the socket file transfer function