Node.js

Transfer a File using Sockets (TLS or non-TLS)

See more Socket/SSL/TLS Examples

Demonstrates how to two programs, one a socket writer and the other a socket reader, can transfer a file. The connection can be TLS or a regular non-encrypted TCP connection. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  On the sending side, we'll load the file into a BinData object and send.
    //  On the receiving side, we'll read from the socket connection into a BinData, and save to a file.
    //  This example assumes the file is not crazy-large, and that the entire contents
    //  can fit into memory.  
    //  (If the file is too large for memory, there are other ways to send. It just involves streaming or 
    //  sending the file chunk-by-chunk..)

    //  This section of code is for the sender.
    var bdToSend = new chilkat.BinData();
    success = bdToSend.LoadFile("somePath/someFile.dat");
    //  Assume success for the example...

    var sndSock = new chilkat.Socket();
    var bUseTls = true;
    var port = 5555;
    var maxWaitMs = 5000;
    success = sndSock.Connect("some_domain_or_ip.com",port,bUseTls,maxWaitMs);
    //  Assume success for the example...

    //  Tell the receiver how many bytes are coming.
    var numBytes = bdToSend.NumBytes;
    var bBigEndian = true;
    success = sndSock.SendInt32(numBytes,bBigEndian);

    //  Send the file data (sends the entire contents of bdToSend).
    success = sndSock.SendBd(bdToSend,0,0);

    //  Get an acknowledgement.
    success = sndSock.ReceiveInt32(bBigEndian);
    if (success == false) {
        console.log(sndSock.LastErrorText);
        return;
    }

    //  Did the receiver get the correct number of bytes?
    if (sndSock.ReceivedInt !== numBytes) {
        console.log("The receiver did not acknowledge with the correct number of bytes.");
        return;
    }

    console.log("File sent!");

    //  ------------------------------------------------------------------------------------
    //  The code below is for the receiving side (running on some other computer..)

    var listenSock = new chilkat.Socket();

    success = listenSock.BindAndListen(5555,25);
    if (success == false) {
        console.log(listenSock.LastErrorText);
        return;
    }

    //  Get the next incoming connection
    //  Wait a maximum of 20 seconds (20000 millisec)
    var rcvSock = new chilkat.Socket();
    success = listenSock.AcceptNext(20000,rcvSock);
    if (success == false) {
        console.log(listenSock.LastErrorText);
        return;
    }

    //  The sender will first send the big-endian integer for the number of bytes
    //  that are forthcoming..
    success = rcvSock.ReceiveInt32(bBigEndian);
    if (success !== true) {
        console.log(rcvSock.LastErrorText);
        return;
    }

    var numBytesComing = rcvSock.ReceivedInt;

    //  Receive that many bytes..
    var bdReceived = new chilkat.BinData();
    success = rcvSock.ReceiveBdN(numBytesComing,bdReceived);
    if (success !== true) {
        console.log(rcvSock.LastErrorText);
        return;
    }

    //  Acknowledge the sender by sending back the number of bytes we received.
    success = rcvSock.SendInt32(bdReceived.NumBytes,bBigEndian);

    //  Close the connection.
    var maxWaitMs = 20;
    rcvSock.Close(maxWaitMs);

    //  Save the received data to a file.
    success = bdReceived.WriteFile("somePath/someFile.dat");
    //  Assume success for the example...

    console.log("File received!");

}

chilkatExample();