C#

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. C#

bool 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.
Chilkat.BinData bdToSend = new Chilkat.BinData();
success = bdToSend.LoadFile("somePath/someFile.dat");
//  Assume success for the example...

Chilkat.Socket sndSock = new Chilkat.Socket();
bool bUseTls = true;
int port = 5555;
int 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.
int numBytes = bdToSend.NumBytes;
bool 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) {
    Debug.WriteLine(sndSock.LastErrorText);
    return;
}

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

Debug.WriteLine("File sent!");

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

Chilkat.Socket listenSock = new Chilkat.Socket();

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

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

int numBytesComing = rcvSock.ReceivedInt;

//  Receive that many bytes..
Chilkat.BinData bdReceived = new Chilkat.BinData();
success = rcvSock.ReceiveBdN(numBytesComing,bdReceived);
if (success != true) {
    Debug.WriteLine(rcvSock.LastErrorText);
    return;
}

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

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

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

Debug.WriteLine("File received!");