I want to ask, why I cannot transfer file from server to client?

When I start to send the file from server, the client side program will have problem.

So, I spend some times to check the code,

But I still cannot find out the problem

Can anyone point out the problem for me?

thanks a lot!

[client side code]

include 

include 

include 

include 

include 

include 

include 

define SA struct sockaddr

define S_PORT 5678

define MAXLEN 1000

define true 1

void errexit(const char *format, ...)
{
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    WSACleanup();
    exit(1);
}

int main(int argc, char *argv [])
{
    WSADATA wsadata;
    SOCKET sockfd;
    int number,message;
    char outbuff[MAXLEN],inbuff[MAXLEN];
    char PWD_buffer[_MAX_PATH];
    struct sockaddr_in servaddr;
    FILE *fp;
    int numbytes;

    char buf[2048];

if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0)
    errexit("WSAStartup failed\n");

if (argc != 2)
    errexit("client IPaddress");

if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET )
    errexit("socket error: error number %d\n", WSAGetLastError());

memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(S_PORT);
if ( (servaddr.sin_addr.s_addr = inet_addr(argv[1])) == INADDR_NONE)
    errexit("inet_addr error: error number %d\n", WSAGetLastError());
if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) == SOCKET_ERROR)
    errexit("connect error: error number %d\n", WSAGetLastError());

if ( (fp = fopen("C:\\users\\pc\\desktop\\COPY.c", "wb")) == NULL){
    perror("fopen");
    exit(1);
}
printf("Still NO PROBLEM!\n");

//Receive file from server
while(1){
    numbytes = read(sockfd, buf, sizeof(buf));
    printf("read %d bytes, ", numbytes);

    if(numbytes == 0){
        printf("\n");
        break;
    }
    numbytes = fwrite(buf, sizeof(char), numbytes, fp);
    printf("fwrite %d bytes\n", numbytes);
}

fclose(fp);
close(sockfd);  
return 0;


}


server side code



include 

include 

include 

include 

include 

include 

include 

include 

define SA struct sockaddr

define S_PORT 5678

define MAXLEN 1000


void errexit(const char *format, ...)
{
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    WSACleanup();
    exit(1);
}

int main(int argc, char *argv [])
{
    WSADATA wsadata;
    SOCKET listenfd, connfd;
    int number, message, numbytes;
    int h, i, j, alen;
    int nread;
    struct sockaddr_in servaddr, cliaddr;
    FILE *in_file, *out_file, *fp;
    char buf[4096];

if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0)
    errexit("WSAStartup failed\n");

listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd == INVALID_SOCKET)
    errexit("cannot create socket: error number %d\n", WSAGetLastError());

memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family      = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port        = htons(S_PORT);

if (bind(listenfd, (SA *) &servaddr, sizeof(servaddr)) == SOCKET_ERROR)
    errexit("can't bind to port %d: error number %d\n", S_PORT, WSAGetLastError());

if (listen(listenfd, 5) == SOCKET_ERROR)
    errexit("can't listen on port %d: error number %d\n", S_PORT, WSAGetLastError());


alen = sizeof(SA);
connfd = accept(listenfd, (SA *) &cliaddr, &alen);

if (connfd == INVALID_SOCKET)
    errexit("accept failed: error number %d\n", WSAGetLastError());

printf("accept one client from %s!\n", inet_ntoa(cliaddr.sin_addr));

fp = fopen ("client.c", "rb"); // open file stored in server

if (fp == NULL) {
    printf("\nfile NOT exist");
}

//Sending file
while(!feof(fp)){
    numbytes = fread(buf, sizeof(char), sizeof(buf), fp);
    printf("fread %d bytes, ", numbytes);
    numbytes = write(connfd, buf, numbytes);
    printf("Sending %d bytes\n",numbytes);
}

fclose (fp);    
closesocket(listenfd);
closesocket(connfd);
return 0;

}