(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 <CkRestW.h>
#include <CkUrlW.h>
#include <CkStreamW.h>

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

    CkRestW rest;

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

    // Connect to the web server
    bool bAutoReconnect = true;
    bool success = rest.Connect(url.host(),url.get_Port(),url.get_Ssl(),bAutoReconnect);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    rest.AddQueryParam(L"name",L"John");
    rest.AddQueryParam(L"age",L"33");

    //  Send the HTTP POST.
    success = rest.SendReqFormUrlEncoded(L"POST",url.path());
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // Read the response header.
    int responseStatusCode = rest.ReadResponseHeader();
    if (responseStatusCode < 0) {
        wprintf(L"%s\n",rest.lastErrorText());
        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) {

        CkStreamW bodyStream;

        // The stream's sink will be a file.
        bodyStream.put_SinkFile(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 = rest.ReadRespBodyStream(bodyStream,true);
        if (success != true) {
            wprintf(L"%s\n",rest.lastErrorText());
            return;
        }

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

    }
    else {
        const wchar_t *errResponse = rest.readRespBodyString();
        if (rest.get_LastMethodSuccess() != true) {
            wprintf(L"%s\n",rest.lastErrorText());
        }
        else {
            wprintf(L"%s\n",errResponse);
        }

    }
    }