Chilkat2-Python

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method. Chilkat2-Python

import sys
import chilkat2

success = False

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

sock = chilkat2.Socket()

# --------------------------------------------------------------------
# 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.MaxReadIdleMs = 2000

# Send some strings, each terminated by a 0 byte.
sock.SendString("This is the 1st string")
sock.SendByte(0)
sock.SendString("This is string number 2")
sock.SendByte(0)

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

# Now let's receive what is echoed back....
# Receive each string and the NULL byte.
# The call to ReceiveStringUntilByte will receive incoming data until the lookForByte is encountered.
# The lookForByte is receive and discarded (it is not returned in the string)
lookForByte = 0
s1 = sock.ReceiveStringUntilByte(lookForByte)
if (sock.LastMethodSuccess == False):
    print(sock.LastErrorText)
    sys.exit()

print(s1)

s2 = sock.ReceiveStringUntilByte(lookForByte)
if (sock.LastMethodSuccess == False):
    print(sock.LastErrorText)
    sys.exit()

print(s2)

# The echo server will also echo back the final LF
sock.ReceiveByte(True)
maxWaitMs = 100
sock.Close(100)

# Output:
# This is the 1st string
# This is string number 2