C

HTTP POST and Stream Response to File

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Demonstrates how to send an HTTP POST and stream the response body directly to a file. C

#include <C_CkRest.h>
#include <C_CkUrl.h>
#include <C_CkStream.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRest rest;
    HCkUrl url;
    BOOL bAutoReconnect;
    int responseStatusCode;
    HCkStream bodyStream;
    const char *errResponse;

    success = FALSE;

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

    rest = CkRest_Create();

    url = CkUrl_Create();
    // This URL will emit a response that echos the query params (name and age)
    CkUrl_ParseUrl(url,"https://www.chilkatsoft.com/readPost.asp");

    // Connect to the web server
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,CkUrl_host(url),CkUrl_getPort(url),CkUrl_getSsl(url),bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkUrl_Dispose(url);
        return;
    }

    CkRest_AddQueryParam(rest,"name","John");
    CkRest_AddQueryParam(rest,"age","33");

    //  Send the HTTP POST.
    success = CkRest_SendReqFormUrlEncoded(rest,"POST",CkUrl_path(url));
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkUrl_Dispose(url);
        return;
    }

    // Read the response header.
    responseStatusCode = CkRest_ReadResponseHeader(rest);
    if (responseStatusCode < 0) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkUrl_Dispose(url);
        return;
    }

    printf("Response status code = %d\n",responseStatusCode);

    // We expect a 200 response status if the file data is coming.
    // Otherwise, we'll get a string response body with an error message(or no response body).
    if (responseStatusCode == 200) {

        bodyStream = CkStream_Create();

        // The stream's sink will be a file.
        CkStream_putSinkFile(bodyStream,"qa_output/out.txt");

        // Read the response body to the stream.  Given that we've
        // set the stream's sink to a file, it will stream directly
        // to the file.
        success = CkRest_ReadRespBodyStream(rest,bodyStream,TRUE);
        if (success != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
            CkRest_Dispose(rest);
            CkUrl_Dispose(url);
            CkStream_Dispose(bodyStream);
            return;
        }

        printf("Successfully streamed the response to a file.\n");

    }
    else {
        errResponse = CkRest_readRespBodyString(rest);
        if (CkRest_getLastMethodSuccess(rest) != TRUE) {
            printf("%s\n",CkRest_lastErrorText(rest));
        }
        else {
            printf("%s\n",errResponse);
        }

    }



    CkRest_Dispose(rest);
    CkUrl_Dispose(url);
    CkStream_Dispose(bodyStream);

    }