C

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method. C

#include <C_CkSocket.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocket sock;
    BOOL useTls;
    int port;
    int maxWaitMs;
    int lookForByte;
    const char *s1;
    const char *s2;

    success = FALSE;

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

    sock = CkSocket_Create();

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

    useTls = FALSE;
    port = 4242;
    maxWaitMs = 5000;
    success = CkSocket_Connect(sock,"tcpbin.com",port,useTls,maxWaitMs);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    //  Wait a max of 2 seconds for a response..
    CkSocket_putMaxReadIdleMs(sock,2000);

    //  Send some strings, each terminated by a 0 byte.
    CkSocket_SendString(sock,"This is the 1st string");
    CkSocket_SendByte(sock,0);
    CkSocket_SendString(sock,"This is string number 2");
    CkSocket_SendByte(sock,0);

    //  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    CkSocket_SendByte(sock,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 = CkSocket_receiveStringUntilByte(sock,lookForByte);
    if (CkSocket_getLastMethodSuccess(sock) == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    printf("%s\n",s1);

    s2 = CkSocket_receiveStringUntilByte(sock,lookForByte);
    if (CkSocket_getLastMethodSuccess(sock) == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    printf("%s\n",s2);

    //  The echo server will also echo back the final LF
    CkSocket_ReceiveByte(sock,TRUE);
    maxWaitMs = 100;
    CkSocket_Close(sock,100);

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


    CkSocket_Dispose(sock);

    }