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 <CkRest.h>
#include <CkUrl.h>
#include <CkStream.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkRest rest;

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

    // Connect to the web server
    bool bAutoReconnect = true;
    success = rest.Connect(url.host(),url.get_Port(),url.get_Ssl(),bAutoReconnect);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

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

    //  Send the HTTP POST.
    success = rest.SendReqFormUrlEncoded("POST",url.path());
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Read the response header.
    int responseStatusCode = rest.ReadResponseHeader();
    if (responseStatusCode < 0) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Response status code = " << responseStatusCode << "\r\n";

    // 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) {

        CkStream bodyStream;

        // The stream's sink will be a file.
        bodyStream.put_SinkFile("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) {
            std::cout << rest.lastErrorText() << "\r\n";
            return;
        }

        std::cout << "Successfully streamed the response to a file." << "\r\n";

    }
    else {
        const char *errResponse = rest.readRespBodyString();
        if (rest.get_LastMethodSuccess() != true) {
            std::cout << rest.lastErrorText() << "\r\n";
        }
        else {
            std::cout << errResponse << "\r\n";
        }

    }
    }