(Objective-C) 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.

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoHttpResponse.h>
#import <CkoBinData.h>
#import <CkoMime.h>
#import <NSString.h>

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

BOOL success;
CkoHttp *http = [[CkoHttp alloc] init];

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

// ...
// 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.
CkoHttpResponse *resp = [http SynchronousRequest: @"www.somedomain.com" port: [NSNumber numberWithInt: 443] ssl: YES req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Get the response body (which is expected to be binary)
CkoBinData *respBody = [[CkoBinData alloc] init];
[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.
CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeBd: respBody];
if (success != YES) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

int numParts = [mime.NumParts intValue];
if (numParts < 2) {
    NSLog(@"%@",@"Expected multipart MIME with at least 2 sub-parts.");
    return;
}

// Get the 1st sub-part, which is the XML.
CkoMime *part0 = [mime GetPart: [NSNumber numberWithInt: 0]];
// Should be OK because we checked NumParts above..
NSString *xmlStr = [part0 GetBodyDecoded];
NSLog(@"%@",xmlStr);
NSLog(@"%@",@"----");

// Save the 2nd part to a file.  (It is a .zip file in our test case..)
CkoMime *part1 = [mime GetPart: [NSNumber numberWithInt: 1]];
success = [part1 SaveBody: @"qa_output/attachedZip.zip"];

// Alternatively, we could extract the binary data to a BinData and use elsewhere..
CkoBinData *zipData = [[CkoBinData alloc] init];
success = [part1 GetBodyBd: zipData];
success = [zipData WriteFile: @"qa_output/attachedZip_again.zip"];

NSLog(@"%@",@"OK.");