(C# UWP/WinRT) HTTP POST and Stream Response to File

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.Rest rest = new Chilkat.Rest();

Chilkat.Url url = new Chilkat.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;
bool success = await rest.ConnectAsync(url.Host,url.Port,url.Ssl,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

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

//  Send the HTTP POST.
success = await rest.SendReqFormUrlEncodedAsync("POST",url.Path);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Read the response header.
int responseStatusCode = await rest.ReadResponseHeaderAsync();
if (responseStatusCode < 0) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Response status code = " + Convert.ToString(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) {

    Chilkat.Stream bodyStream = new Chilkat.Stream();

    // The stream's sink will be a file.
    bodyStream.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 = await rest.ReadRespBodyStreamAsync(bodyStream,true);
    if (success != true) {
        Debug.WriteLine(rest.LastErrorText);
        return;
    }

    Debug.WriteLine("Successfully streamed the response to a file.");

}
else {
    string errResponse = await rest.ReadRespBodyStringAsync();
    if (rest.LastMethodSuccess != true) {
        Debug.WriteLine(rest.LastErrorText);
    }
    else {
        Debug.WriteLine(errResponse);
    }

}