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#

bool success = false;

//  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;
success = rest.Connect(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 = rest.SendReqFormUrlEncoded("POST",url.Path);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  Read the response header.
int responseStatusCode = rest.ReadResponseHeader();
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 = rest.ReadRespBodyStream(bodyStream,true);
    if (success != true) {
        Debug.WriteLine(rest.LastErrorText);
        return;
    }

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

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

}