(C# UWP/WinRT) Parse Multipart Binary Http Response

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf.

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.

bool success;
Chilkat.Http http = new Chilkat.Http();

Chilkat.HttpRequest req = new Chilkat.HttpRequest();

// ...
// Insert code here to construct some kind of HTTP request.
// this example is to show how to parse a particular kind of response.
// ...
// ...

// Send the request (whatever it may be in your case) to get the HTTP response object.
Chilkat.HttpResponse resp = await http.SynchronousRequestAsync("www.somedomain.com",443,true,req);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// Get the response body (which is expected to be binary)
Chilkat.BinData respBody = new Chilkat.BinData();
resp.GetBodyBd(respBody);

// For this example, the response body contains something like this:

// ------=_Part_21302_2029949381.1547401515443
// Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
// Content-Transfer-Encoding: 8bit
// Content-ID: <rootpart@ws.jboss.org>
// 
// <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'><env:Header></env:Header><env:Body>...</env:Body></env:Envelope>
// ------=_Part_21302_2029949381.1547401515443
// Content-Type: application/octet-stream
// Content-Transfer-Encoding: binary
// Content-Id: <fileArchivio-7d302908-4d64-43d3-bf4e-79ce806d43b3@ws.jboss.org>
// 
// BINARY_CONTENT_HERE...
// 
// ------=_Part_21302_2029949381.1547401515443--
// 

// Load it into a Chilkat MIME object.
Chilkat.Mime mime = new Chilkat.Mime();
success = mime.LoadMimeBd(respBody);
if (success != true) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

int numParts = mime.NumParts;
if (numParts < 2) {
    Debug.WriteLine("Expected multipart MIME with at least 2 sub-parts.");
    return;
}

// Get the 1st sub-part, which is the XML.
Chilkat.Mime part0 = mime.GetPart(0);
// Should be OK because we checked NumParts above..
string xmlStr = part0.GetBodyDecoded();
Debug.WriteLine(xmlStr);
Debug.WriteLine("----");

// Save the 2nd part to a file.  (It is a .zip file in our test case..)
Chilkat.Mime part1 = mime.GetPart(1);
success = part1.SaveBody("qa_output/attachedZip.zip");

// Alternatively, we could extract the binary data to a BinData and use elsewhere..
Chilkat.BinData zipData = new Chilkat.BinData();
success = part1.GetBodyBd(zipData);
success = zipData.WriteFile("qa_output/attachedZip_again.zip");

Debug.WriteLine("OK.");