Unicode C

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. Unicode C

#include <C_CkSocketW.h>
#include <C_CkBinDataW.h>

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

    success = FALSE;

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

    sock = CkSocketW_Create();

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

    useTls = FALSE;
    port = 4242;
    maxWaitMs = 5000;
    success = CkSocketW_Connect(sock,L"tcpbin.com",port,useTls,maxWaitMs);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        return;
    }

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

    // Send 26 bytes contained in a Chilkat BinData
    bdToSend = CkBinDataW_Create();
    i = 0;
    byteVal = 65;
    while (i < 26) {
        CkBinDataW_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.
    CkSocketW_SendBd(sock,bdToSend,0,0);

    // The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    CkSocketW_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 = CkBinDataW_Create();
    // Receive the 26 bytes previously sent, plus the LF char.
    success = CkSocketW_ReceiveBdN(sock,27,bdRecv);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        CkBinDataW_Dispose(bdToSend);
        CkBinDataW_Dispose(bdRecv);
        return;
    }

    // Show the contents of bdRecv in hex format
    wprintf(L"%s\n",CkBinDataW_getEncoded(bdRecv,L"hex"));

    // Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A


    CkSocketW_Dispose(sock);
    CkBinDataW_Dispose(bdToSend);
    CkBinDataW_Dispose(bdRecv);

    }