Objective-C

Parse Multipart Binary Http Response

See more HTTP Examples

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

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

BOOL success = NO;

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

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 = [[CkoHttpResponse alloc] init];
success = [http HttpSReq: @"www.somedomain.com" port: [NSNumber numberWithInt: 443] ssl: YES request: req response: resp];
if (success == NO) {
    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 == NO) {
    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 = [[CkoMime alloc] init];
[mime PartAt: [NSNumber numberWithInt: 0] subPart: part0];

//  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 = [[CkoMime alloc] init];
[mime PartAt: [NSNumber numberWithInt: 1] subPart: part1];

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.");