(C) Debugging with Socket Session Logging

Debugging with socket session logging.

The Chilkat Socket component provides properties for keeping a session log making it possible to see the exact bytes received and sent on a TCP/IP or SSL connection. To enable session logging, set the KeepSessionLog property = TRUE. The SessionLogEncoding property controls how binary, non-printable bytes are represented in the log. There are two possible settings: Possible values are "esc" and "hex". The default value is "esc".

When set to "hex", the bytes are encoded as a hexidecimalized string. The "esc" encoding is a C-string like encoding, and is more compact than hex if most of the data to be logged is text. Printable us-ascii chars are unmodified. Common "C" control chars are represented as "\r", "\n", "\t", etc. Non-printable and byte values greater than 0x80 are escaped using a backslash and hex encoding: \xHH. Certain printable chars are backslashed: SPACE, double-quote, single-quote, etc.

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#include <C_CkSocket.h>

void ChilkatSample(void)
    {
    HCkSocket socket;
    BOOL ssl;
    int maxWaitMillisec;
    BOOL success;
    const char *httpGet;
    const char *httpHeader;

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

    socket = CkSocket_Create();

    // Enable session logging:
    CkSocket_putKeepSessionLog(socket,TRUE);
    CkSocket_putSessionLogEncoding(socket,"esc");

    // To demonstrate session logging, we'll connect to an
    // HTTP server and download the HTTP response header:
    ssl = FALSE;
    maxWaitMillisec = 20000;
    success = CkSocket_Connect(socket,"www.chilkatsoft.com",80,ssl,maxWaitMillisec);
    if (success != TRUE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    // Set maximum timeouts for reading an writing (in millisec)
    CkSocket_putMaxReadIdleMs(socket,10000);
    CkSocket_putMaxSendIdleMs(socket,10000);

    // The socket component includes a BuildHttpGetRequest
    // method for convenience. Build a GET and send it to 
    // the web server:

    httpGet = CkSocket_buildHttpGetRequest(socket,"http://www.chilkatsoft.com/");

    // Send it...
    success = CkSocket_SendString(socket,httpGet);
    if (success != TRUE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    // Read the response up to the first double CRLF:
    httpHeader = CkSocket_receiveUntilMatch(socket,"\r\n\r\n");
    if (CkSocket_getLastMethodSuccess(socket) != TRUE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    // Close the connection with the server
    // Wait a max of 20 seconds (20000 millsec)
    success = CkSocket_Close(socket,20000);

    // Display the session log:
    printf("%s\n",CkSocket_sessionLog(socket));

    // Show the HTTP response header:
    printf("%s\n",httpHeader);


    CkSocket_Dispose(socket);

    }