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

• • Reply

  16 years ago

  by thekiller

  thekiller mafia

  , United States

  Joined 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
  

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• • Reply

  16 years ago

  by SweetBomber

  SweetBomber

  Portugal, Castelo Branco, Portugal

  Joined 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 filename[MAXPATH];
       unsigned long filesize;
       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.filesize-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 filename[MAXPATH];
       unsigned long filesize;
       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.filesize-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

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• • Reply

  16 years ago

  by thekiller

  thekiller mafia

  , United States

  Joined 16 years ago

  yup ,it help me a lot  man....
  

  
  i really appreciate uer answer .
  

  
  c ya'  
  

  
  

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• • Reply

  16 years ago

  by alibaba

  alibaba

  , United States

  Joined 16 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!!!

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• • Reply

  16 years ago

  by Apoc

  Michael Gagne

  Dallas/Fort Worth, TX, United States

  Joined 19 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.

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• • Reply

  16 years ago

  by alibaba

  alibaba

  , United States

  Joined 16 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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