C

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. C

#include <C_CkSocket.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocket sock;
    BOOL useTls;
    int port;
    int maxWaitMs;
    HCkBinData bdToSend;
    int i;
    int byteVal;
    HCkBinData bdRecv;

    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 26 bytes contained in a Chilkat BinData
    bdToSend = CkBinData_Create();
    i = 0;
    byteVal = 65;
    while (i < 26) {
        CkBinData_AppendByte(bdToSend,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.
    CkSocket_SendBd(sock,bdToSend,0,0);

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

    //  The echo server will echo back whatever is sent to it.
    //  We should be able to read the same bytes back..
    bdRecv = CkBinData_Create();
    //  Receive the 26 bytes previously sent, plus the LF char.
    success = CkSocket_ReceiveBdN(sock,27,bdRecv);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        CkBinData_Dispose(bdToSend);
        CkBinData_Dispose(bdRecv);
        return;
    }

    //  Show the contents of bdRecv in hex format
    printf("%s\n",CkBinData_getEncoded(bdRecv,"hex"));

    //  Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A


    CkSocket_Dispose(sock);
    CkBinData_Dispose(bdToSend);
    CkBinData_Dispose(bdRecv);

    }