File Transfer Using CSockets

Environment: VC6 SP4, NT4 SP5

Here are a couple of functions to transfer files between two computers. I haven't seen any CSocket file transfer utilities around so this might just help you. The code consists of two functions. The first function is the "server" and the second function is the "client". Use them accordingly.

Now for the server portion:


void SendFile()
{
 #define PORT 34000 /// Select any free port you wish

 AfxSocketInit(NULL);
 CSocket sockSrvr; 
 sockSrvr.Create(PORT); // Creates our server socket
 sockSrvr.Listen(); // Start listening for the client at PORT
 CSocket sockRecv;
 sockSrvr.Accept(sockRecv); // Use another CSocket to accept the connection


 CFile myFile;
 myFile.Open("C:\\ANYFILE.EXE", CFile::modeRead | CFile::typeBinary); 

 int myFileLength = myFile.GetLength(); // Going to send the correct File Size

 sockRecv.Send(&myFileLength, 4); // 4 bytes long
		
 byte* data = new byte[myFileLength]; 

 myFile.Read(data, myFileLength);

 sockRecv.Send(data, myFileLength); //Send the whole thing now

 myFile.Close();
 delete data;

 sockRecv.Close();
}
And the client of course:

void GetFile()
{
 #define PORT 34000 /// Select any free port you wish

 AfxSocketInit(NULL);
 CSocket sockClient;
 sockClient.Create();

 // "127.0.0.1" is the IP to your server, same port
 sockClient.Connect("127.0.0.1", PORT); 

 int dataLength;
 sockClient.Receive(&dataLength, 4); //Now we get the File Size first
		
 byte* data = new byte[dataLength];
 sockClient.Receive(data, dataLength); //Get the whole thing

 CFile destFile("C:\\temp\\ANYFILE.EXE", 
  CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);

 destFile.Write(data, dataLength); // Write it

 destFile.Close();

 delete data;
 sockClient.Close();
}
And thats all folks! Just make sure the server function runs before the client. Im sure many improvements can be made to this like not sending the file in one big chunk and not hardcoding many of the functions. In any case this should be easy enough for anyone to just "pop" into their project for a quick client/server transfer solution.

Downloads

Download demo project - 9 Kb
Download source code for functions- 1 Kb


Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Relying on outside companies to manage your network and server environments for your business and applications to meet the needs and demands of your users can be stressful. This is especially true as many Managed Hosting organizations fail to meet their service level agreements. Read this Forrester total economic impact report and learn what makes INetU different and how they exceed their customers' managed hosting expectations.

  • Although much publicity around computer security points to hackers and other outside attacks, insider threats can be particularly insidious and dangerous, whether caused by malice or employee negligence. In this report, you learn the eight most significant cybersecurity threats that could impact your organization (at any time), Forbes cited internal threats as No. 3, noting that internal attacks can be "the most devastating" due to the amount of damage privileged users can inflict and the type of data they can …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date