Thread: How to use or set up winstock and to send a txt file

Originally Posted by vart

you should ask msdn... I believe he is the guy you are looking for...

LOL, nice ^.^; Yea I still dont get msdn when it comes to alot of things, was hoping for a more detail site for like dumbes ^^: lol. Kinda like this site and how they explain a little more into whats going on and why.

I do understand that if you have one side of the code that it shouldnt be to hard to make the other side seeing as you are using sending and listening via winsock connections right?

I've also been finding some code to help out but, I cant seem to find wsock32.lib to link with my project, wasnt sure if Dev-C++ carry the lib or not; also having the same problem for winsock.h and winsock2.h.

well, it depends on what exactly you mean by tranfer a text file. If you mean download a text file to your application, the look into the InternetOpen, HttpOpenRequest, etc functions.

Woundering if someone could make a very simple example for me to play with so I could understand it a little more or how to send a .txt file to the client computer like a msg.

It's your responsibility to make sure it's defect free.

Code:

#pragma comment( lib, "ws2_32.lib" )
#include <winsock2.h>
#include <stdio.h>
#include <sys/stat.h>

WSADATA wsaData;
SOCKET mySocket;
sockaddr_in con;
SOCKET AcceptSocket;

#define PORT   4370

int GetFileSize(char file[], int *len)
{
    struct stat status;
    int res;
    res = stat (file, &status);
    if (res != 0)
    {
        fprintf(stderr,"stat function not available\n");
        return (-1);
    }
    *len = (int) status.st_size;
    return (0);
}

void ServerConnection(char *ip,int port)
{
    con.sin_family = AF_INET;
    con.sin_addr.s_addr = inet_addr( ip );
    con.sin_port = htons( port );

    if ( connect( mySocket, (SOCKADDR*) &con, sizeof(con) ) == SOCKET_ERROR) {
        printf( "Failed to connect.\n" );
        WSACleanup();
        return;
    }
}

int InitializeServer(int port)
{
    con.sin_family = AF_INET;
    con.sin_addr.s_addr = inet_addr( "0.0.0.0" );
    con.sin_port = htons( port );

    if ( bind( mySocket, (SOCKADDR*) &con, sizeof(con) ) == SOCKET_ERROR) {
        printf( "Failed to connect.\n" );
        WSACleanup();
        return -1;
    }
    if ( listen( mySocket, 1 ) == SOCKET_ERROR )
        printf( "Error listening on socket.\n");
    return 0;
}

void ListenForClient(void)
{
    AcceptSocket = SOCKET_ERROR;
    while ( AcceptSocket == SOCKET_ERROR ) {
        AcceptSocket = accept( mySocket, NULL, NULL );
    }
    mySocket = AcceptSocket;
}

int SendData(char *sendbuffer)
{
    return send( mySocket, sendbuffer, strlen(sendbuffer), 0 );
}


int ReceiveData(char *receivebuffer,int size)
{
    int ret = recv( mySocket, receivebuffer, size, 0 );
    receivebuffer[ret] = '\0';
    return ret;
}

void CloseConnection(void)
{
    closesocket(mySocket);
}


void ReceiveFile(char *filename)
{
    int recs, size;
    char record[50] = {0};
    recv( mySocket, filename, 32, 0 );
    send( mySocket, "GOOD", strlen("GOOD"), 0 );
    FILE *filereceive = fopen(filename, "wb");
    recs = recv( mySocket, record, 32, 0 );
    send( mySocket, "GOOD", strlen("GOOD"), 0 );
    record[recs]='\0';
    size = atoi(record);
    while(size > 0)
    {
        char buffer[1030];

        if(size>=1024)
        {
            recv( mySocket, buffer, 1024, 0 );
            send( mySocket, "GOOD", strlen("GOOD"), 0 );
            fwrite(buffer, 1024, 1, filereceive);
        }
        else
        {
            recv( mySocket, buffer, size, 0 );
            send( mySocket, "GOOD", strlen("GOOD"), 0 );
            buffer[size]='\0';
            fwrite(buffer, size, 1, filereceive);
        }
        size -= 1024;
    }
    fclose(filereceive);
}

void TransmitFile(char *filepath)
{
    char filename[50] = {0};
    char filesize[10] = {0};
    char rec[32] = {0};
    char buffer[1030] = {0};
    int size, i, j;

    i =strlen(filepath);
    for(;i>0;i--)if(filepath[i-1]=='\\')break;
    for(j=0;i<=(int)strlen(filepath);i++)filename[j++]=filepath[i];
    if(GetFileSize(filepath, &size ) == -1)
        return;
    itoa(size,filesize,10);
    send( mySocket, filename, strlen(filename), 0 );
    recv( mySocket, rec, 32, 0 );
    send( mySocket, filesize, strlen(filesize), 0 );
    recv( mySocket, rec, 32, 0 );
    FILE *fr = fopen(filepath, "rb");
    while(size > 0)
    {
        if(size>=1024)
        {
            fread(buffer, 1024, 1, fr);
            send( mySocket, buffer, 1024, 0 );
            recv( mySocket, rec, 32, 0 );
        }
        else
        {
            fread(buffer, size, 1, fr);
            buffer[size]='\0';
            send( mySocket, buffer, size, 0 );
            recv( mySocket, rec, 32, 0 );
        }
        size -= 1024;
    }
    fclose(fr);
}


void Server(void)
{
    char fname[32] = {0};
    char rec[50] = {0};
    if(InitializeServer(PORT) == -1)
    {
        printf("Server initialization failed\n");
        return;
    }
    while (TRUE) {
        ListenForClient();
        while(TRUE)
        {
            ReceiveData(rec,32);
            SendData("GOOD");
            if(strcmp(rec,"TransmitFile")==0)
            {
                ReceiveFile(fname);
            }
            if(strcmp(rec,"TerminateConnection")==0)break;
        }
        CloseConnection();
    }
}

void Client(char *ip, char *filepath)
{
    char rec[32] = {0};
    ServerConnection(ip,PORT);
    SendData("TransmitFile");
    ReceiveData(rec,32);
    TransmitFile(filepath);
    SendData("TerminateConnection");
    ReceiveData(rec,32);
}

int  main(int argc, char *argv[])
{
    int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
    if ( iResult != NO_ERROR )
        printf("WSAStartup() error\n");
    mySocket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );

    if ( mySocket == INVALID_SOCKET ) {
        printf( "socket() error: %ld\n", WSAGetLastError() );
        WSACleanup();
        return -1;
    }
    if(argc == 1)
        Server();
    else Client(argv[1],argv[2]);
    return 0;
}

Wow, that helps out alot. I think I am understand it somewhat now. Thanks for all the help guys ^^ I'll see what I can do from all this and if I have any problems i'll ask.