(C) Duplicate Python websockets

See more WebSocket Examples

Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

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

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

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

    // In Python, the following line of code does more than just connect:
    // 
    //      websockets.connect('ws://192.168.1.35/websocket')
    // 
    // It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
    // But this URI begins with just "ws:/", so no TLS.

    // Also, after connecting, a GET request is sent to the /websocket endpoint.
    // In summary, the websockets.connect function is establishing the connection and it sends a GET request.

    // First establish the connection.
    // No TLS, use the default HTTP port 80.
    rest = CkRest_Create();
    success = CkRest_Connect(rest,"192.168.1.35",80,FALSE,FALSE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    ws = CkWebSocket_Create();

    // Tell the WebSocket to use this connection.
    success = CkWebSocket_UseConnection(ws,rest);
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        return;
    }

    // Add the standard WebSocket open handshake headers that will be needed.
    // (This adds the required HTTP request headers to the rest object.)
    CkWebSocket_AddClientHeaders(ws);

    // Now send the GET request to /websockets.
    responseBody = CkRest_fullRequestNoBody(rest,"GET","/websockets");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        return;
    }

    // If successful, the HTTP response status code should be 101,
    // and the response body will be empty. (If it failed, we'll have a look
    // at the response body..)
    statusCode = CkRest_getResponseStatusCode(rest);
    printf("Response status code: %d\n",statusCode);

    if (statusCode != 101) {
        printf("%s\n",responseBody);
        printf("-- Failed because of unexpected response status code.\n");
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        return;
    }

    // We have the expected 101 response, so let's now validate the 
    // contents of the response.
    success = CkWebSocket_ValidateServerHandshake(ws);
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        return;
    }

    printf("WebSocket connection successful.\n");

    // The application may now begin sending and receiving frames on the WebSocket connection.

    // The 1st frame sent by the Python snippet is:
    // 
    //     websocket.send("http.controller_login:username=xxx&password=xxxxx")
    // 

    // Send the same using Chilkat, and get the response.
    finalFrame = TRUE;
    success = CkWebSocket_SendFrame(ws,"http.controller_login:username=xxx&password=xxxxx",finalFrame);
    if (success != TRUE) {
        printf("%s\n",CkWebSocket_lastErrorText(ws));
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        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));
        CkRest_Dispose(rest);
        CkWebSocket_Dispose(ws);
        return;
    }

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

    // Continue with whatever additional communications are desired...
    // ....
    // 


    CkRest_Dispose(rest);
    CkWebSocket_Dispose(ws);

    }