Chilkat Examples

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C Examples


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(C) Send and Receive WebSocket Frame

Demonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx

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#include <C_CkWebSocket.h>
#include <C_CkRest.h>

void ChilkatSample(void)
    {
    HCkWebSocket ws;
    HCkRest rest;
    BOOL success;
    const char *responseBodyIgnored;
    BOOL finalFrame;
    const char *receivedStr;

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

    ws = CkWebSocket_Create();

    //  For brevity, this example does not check for errors when etablishing the WebSocket connection.
    //  See Establish WebSocket Connection for more complete sample code for making the connection.

    rest = CkRest_Create();
    //  Connect to websockets.chilkat.io
    //  (websockets.chilkat.io accepts frames of up to 16K in size and echoes them back)
    success = CkRest_Connect(rest,"websockets.chilkat.io",80,FALSE,FALSE);
    CkWebSocket_UseConnection(ws,rest);
    CkWebSocket_AddClientHeaders(ws);
    responseBodyIgnored = CkRest_fullRequestNoBody(rest,"GET","/wsChilkatEcho.ashx");
    success = CkWebSocket_ValidateServerHandshake(ws);
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkWebSocket_Dispose(ws);
        CkRest_Dispose(rest);
        return;
    }

    //  This example demonstrates sending a frame and receiving a text frame.

    //  Send a frame containing the string "Hello World!"
    //  This will be the first and final frame, and therefore this constitutes the entire message.
    finalFrame = TRUE;
    success = CkWebSocket_SendFrame(ws,"Hello World!",finalFrame);
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkWebSocket_Dispose(ws);
        CkRest_Dispose(rest);
        return;
    }

    //  Read an incoming frame.
    success = CkWebSocket_ReadFrame(ws);
    if (success != TRUE) {
        printf("Failed to receive a frame\n");
        printf("ReadFrame fail reason = %d\n",CkWebSocket_getReadFrameFailReason(ws));
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkWebSocket_Dispose(ws);
        CkRest_Dispose(rest);
        return;
    }

    //  Show the string that was received.
    receivedStr = CkWebSocket_getFrameData(ws);
    printf("Received: %s\n",receivedStr);

    //  Close the websocket connection.
    success = CkWebSocket_SendClose(ws,TRUE,1000,"Closing this websocket.");
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkWebSocket_Dispose(ws);
        CkRest_Dispose(rest);
        return;
    }

    //  Read the Close response.
    success = CkWebSocket_ReadFrame(ws);
    if (success != TRUE) {
        printf("ReadFrame fail reason = %d\n",CkWebSocket_getReadFrameFailReason(ws));
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkWebSocket_Dispose(ws);
        CkRest_Dispose(rest);
        return;
    }

    //  Should receive the "Close" opcode.
    printf("Received opcode: %s\n",CkWebSocket_frameOpcode(ws));
    //  Should be the same status code we sent (1000)
    printf("Received close status code: %d\n",CkWebSocket_getCloseStatusCode(ws));
    //  The server may echo the close reason.  If not, this will be empty.
    printf("Echoed close reason: %s\n",CkWebSocket_closeReason(ws));

    printf("Success.\n");


    CkWebSocket_Dispose(ws);
    CkRest_Dispose(rest);

    }

 

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