(Unicode C) HTTP POST and Stream Response to File

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

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#include <C_CkRestW.h>
#include <C_CkUrlW.h>
#include <C_CkStreamW.h>

void ChilkatSample(void)
    {
    HCkRestW rest;
    HCkUrlW url;
    BOOL bAutoReconnect;
    BOOL success;
    int responseStatusCode;
    HCkStreamW bodyStream;
    const wchar_t *errResponse;

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

    rest = CkRestW_Create();

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

    // Connect to the web server
    bAutoReconnect = TRUE;
    success = CkRestW_Connect(rest,CkUrlW_host(url),CkUrlW_getPort(url),CkUrlW_getSsl(url),bAutoReconnect);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkUrlW_Dispose(url);
        return;
    }

    CkRestW_AddQueryParam(rest,L"name",L"John");
    CkRestW_AddQueryParam(rest,L"age",L"33");

    //  Send the HTTP POST.
    success = CkRestW_SendReqFormUrlEncoded(rest,L"POST",CkUrlW_path(url));
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkUrlW_Dispose(url);
        return;
    }

    // Read the response header.
    responseStatusCode = CkRestW_ReadResponseHeader(rest);
    if (responseStatusCode < 0) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkUrlW_Dispose(url);
        return;
    }

    wprintf(L"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 = CkStreamW_Create();

        // The stream's sink will be a file.
        CkStreamW_putSinkFile(bodyStream,L"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 = CkRestW_ReadRespBodyStream(rest,bodyStream,TRUE);
        if (success != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
            CkRestW_Dispose(rest);
            CkUrlW_Dispose(url);
            CkStreamW_Dispose(bodyStream);
            return;
        }

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

    }
    else {
        errResponse = CkRestW_readRespBodyString(rest);
        if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        }
        else {
            wprintf(L"%s\n",errResponse);
        }

    }



    CkRestW_Dispose(rest);
    CkUrlW_Dispose(url);
    CkStreamW_Dispose(bodyStream);

    }