C#

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method. C#

bool success = false;

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

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

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

bool useTls = false;
int port = 4242;
int maxWaitMs = 5000;
success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs);
if (success == false) {
    Debug.WriteLine(sock.LastErrorText);
    return;
}

//  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)
int lookForByte = 0;
string s1 = sock.ReceiveStringUntilByte(lookForByte);
if (sock.LastMethodSuccess == false) {
    Debug.WriteLine(sock.LastErrorText);
    return;
}

Debug.WriteLine(s1);

string s2 = sock.ReceiveStringUntilByte(lookForByte);
if (sock.LastMethodSuccess == false) {
    Debug.WriteLine(sock.LastErrorText);
    return;
}

Debug.WriteLine(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