CODEWITHSUNDEEP
c++socketsnetwork-programming
echo9
echo9

Reputation: 1309

Sending a file from server side to client side using TCP in C++

Now this is a bit more of a request since I am not able to find any simple and direct example for this.

Issue: I want to send a file from the server side to the client side.

When the server is already up and listening on a port and the client requests a file (file's name being accepted as a parameter with the server IP address such as 127.0.0.1 and port no.) and then the process of transfer starts till the file is copied.

Also can someone incorporate how can i measure the average transfer speed on the server side?

BTW: I am running Linux x86 Cheers, echo9

Upvotes: 1

Views: 6984

Answers (3)

karlphillip
karlphillip

Reputation: 93410

Check Beej's Guide to Network Programming. There are lots of examples there that shows how to implement a client/server architecture using sockets and send data between them.

EDIT:

Check items 8 and 9 from this tutorial for a complete example on client/server. Note that on item 8, the server sends a char* to the client:

send(fd2,"Welcome to my server.\n",22,0); /* send to the client welcome message */

On this case, it's the "Welcome to my server.\n" string, and the next parameter is the size of the string you want to send.

When you need to send data from a file it's the same thing: first, you need to read the data from the file and store it in a char* buffer; that you manually allocated through malloc().

Something like this:

char* buffer;
buffer = (char*) malloc(1024); // let's say your file has 1KB of data

/* insert here the code to read data from the file and populate buffer with it */

send(fd2, buffer, 1024,0);

Upvotes: 4

Robᵩ
Robᵩ

Reputation: 168626

Here's a simple protocol:

CLIENT                   SERVER
                         socket(), bind(), listen()
socket(), connect()
                         accept()
send("GET filename\n")
                         recv(buffer)
                         inspect buffer, parse filename (stop at space or \n),
                         open() file.
                         sendfile(file, socket)
                         close(socket)
                         close(file)
 recv(socket)
 close()

This protocol has the advantage of being able to use your web browser as the client, and your web server as the host, assuming they each support HTTP/0.9.

Here's a client.

Upvotes: 2

Marc Mutz - mmutz
Marc Mutz - mmutz

Reputation: 25293

You might want to consider using sendfile(2).

Upvotes: 0

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