how can i in C++ send file to other PC over net ?

  • 16 years ago

    hey


    am new ,and am looking for code that make me get how could i Transfer file to other computer in Client Server style ,
    or in other words "FileTransfer " between 2 computers


    am coding with C++


    i wish some 1 can help me
    thanx a lot


    bye

  • 16 years ago

    Wrong place. (this is vb area)
    However, you can pickup a Winsock tutorial.


    it doesn't allow direct file sending, it works essentially with streams.


    but you can do something like this (after initialised the socket, see a winsock tutorial)




    sender:


    Code:

    define SEND_FILE 0x20


    define ACK 0x47



    struct fileinfo
     {
         char file
    name[MAXPATH];
         unsigned long file
    size;
         unsigned long crc;
     } info;


    char data[513];
    int packs, remain,read;


    openfile(&(info.filename), &(info.file_size), &(info.crc)); //this function doesn't exist, is supposed to open the file, get its size, and calc the crc


    memset(data, 0, 256);


    *memset=SEND_FILE;
    memcpy(data+1,&info,sizeof(info));


    send(socket,data,256);
    recv(socket,data,256);
    if(*data!=ACK)
       ;//transfer error


    remain=info.filesize % 512 ;
    packs=(info.file
    size-ramain)/512;


    while(packs--)
       {
            if(!ReadFile(file,data,512,&read,NULL))
                ; //read error
            if(written!=pack)
                ; //read error
            send(socket,data,512);
            recv(socket,data,256);
            if(*data!=ACK)
               ;//transfer error
        }
        if(!ReadFile(file,data,remain,&read,NULL))
           ; //read error
        if(written!=pack)
           ; //read error


        send(socket,data,remain);
        recv(socket,data,256);
        if(*data!=ACK)
           ;//transfer error
       }




    receiver:

    Code:

    define SEND_FILE 0x20


    define ACK 0x47



    struct fileinfo
     {
         char file
    name[MAXPATH];
         unsigned long file
    size;
         unsigned long crc;
     } info;


    char data[513];
    int packs, remain,written;


    open_file(); //this function doesn't exist, is supposed to get a filename, and open it for writing


    memset(data, 0, 256);


    recv(socket,data,256)
    if(data==SEND_FILE)
       {
           memcopy(&info,data+1,sizeof(info));
           
    data=ACK;
           send(socket,data,256);


           remain=info.filesize % 512 ;
           packs=(info.file
    size-ramain)/512;



           while(packs--)
              {
                  recv(socket,data,512);
                  if(!WriteFile(file,data,512,&written,NULL))
                     ; //write error
                  if(written!=pack)
                     ; //write error
                  *data=ACK;
                  send(socket,data,256);
              }
            recv(socket,data,remain);
            if(!WriteFile(file,data,remain,&written,NULL))
                ; //write error
            if(written!=pack)
                ; //write error
            *data=ACK;
            send(socket,data,256);


            if(calc_crc(file)!=info.crc)
               ; //transfeer error
       
       }



    I hope this work. I didn't test it. ACK and SEND_FILE aren't standards
    The crc is highly recomended


    good luck

  • 16 years ago

    yup ,it help me a lot  man....


    i really appreciate uer answer .


    c ya'  


  • 15 years ago

    How to open the file???And how to calculate the crc????


    Actually i am doing file transfer also.... but face a lot of problem... URGENT.. HELP!!!

  • 15 years ago

    I moved this topic over to the C++ forum.


    Here is a link you can look at for opening files.


    http://www.cpcug.org/user/clemenzi/technical/Languages/Console_C++/fstream.html


    You use fstream.h, so #include <fstream.h> and you have access to those functions.


    You can also try http://www.google.com and search for fstream.h.

  • 15 years ago

    thanx...
    Another question is : How to split a file to chunk files and recombine them???
    This is because i need to send the chunk file between 2 pc using multicast.
    Thanx!

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