CkPython

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. CkPython

import sys
import chilkat

success = False

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

sock = chilkat.CkSocket()

# --------------------------------------------------------------------
# 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):
    print(sock.lastErrorText())
    sys.exit()

# Wait a max of 2 seconds for a response..
sock.put_MaxReadIdleMs(2000)

# Send 26 bytes contained in a Chilkat BinData
bdToSend = chilkat.CkBinData()
i = 0
byteVal = 65
while 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.CkBinData()
# Receive the 26 bytes previously sent, plus the LF char.
success = sock.ReceiveBdN(27,bdRecv)
if (success == False):
    print(sock.lastErrorText())
    sys.exit()

# Show the contents of bdRecv in hex format
print(bdRecv.getEncoded("hex"))

# Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A