Unicode C

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte method. Unicode C

#include <C_CkSocketW.h>

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

    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 some strings, each terminated by a 0 byte.
    CkSocketW_SendString(sock,L"This is the 1st string");
    CkSocketW_SendByte(sock,0);
    CkSocketW_SendString(sock,L"This is string number 2");
    CkSocketW_SendByte(sock,0);

    //  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    CkSocketW_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 = CkSocketW_receiveStringUntilByte(sock,lookForByte);
    if (CkSocketW_getLastMethodSuccess(sock) == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        return;
    }

    wprintf(L"%s\n",s1);

    s2 = CkSocketW_receiveStringUntilByte(sock,lookForByte);
    if (CkSocketW_getLastMethodSuccess(sock) == FALSE) {
        wprintf(L"%s\n",CkSocketW_lastErrorText(sock));
        CkSocketW_Dispose(sock);
        return;
    }

    wprintf(L"%s\n",s2);

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

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


    CkSocketW_Dispose(sock);

    }