Go

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. Go

    success := false

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

    sock := chilkat.NewSocket()

    // --------------------------------------------------------------------
    // This example uses the public TCP echo service at https://tcpbin.com/
    // --------------------------------------------------------------------

    useTls := false
    port := 4242
    maxWaitMs := 5000
    success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs)
    if success == false {
        fmt.Println(sock.LastErrorText())
        sock.DisposeSocket()
        return
    }

    // Wait a max of 2 seconds for a response..
    sock.SetMaxReadIdleMs(2000)

    // Send 26 bytes contained in a Chilkat BinData
    bdToSend := chilkat.NewBinData()
    i := 0
    byteVal := 65
    for i < 26 {
        bdToSend.AppendByte(byteVal)
        byteVal = byteVal + 1
        i = i + 1
    }

    // Send the contents of the BinData
    // Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
    sock.SendBd(bdToSend,0,0)

    // The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    sock.SendByte(10)

    // The echo server will echo back whatever is sent to it.
    // We should be able to read the same bytes back..
    bdRecv := chilkat.NewBinData()
    // Receive the 26 bytes previously sent, plus the LF char.
    success = sock.ReceiveBdN(27,bdRecv)
    if success == false {
        fmt.Println(sock.LastErrorText())
        sock.DisposeSocket()
        bdToSend.DisposeBinData()
        bdRecv.DisposeBinData()
        return
    }

    // Show the contents of bdRecv in hex format
    fmt.Println(*bdRecv.GetEncoded("hex"))

    // Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A

    sock.DisposeSocket()
    bdToSend.DisposeBinData()
    bdRecv.DisposeBinData()