(Objective-C) HTTP multipart/form-data Upload

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST.

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoHttpResponse.h>

// 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];
req.HttpVerb = @"POST";
req.ContentType = @"multipart/form-data";
req.Path = @"rcvFormDataUpload.aspx";

// Send an "Expect: 100-continue" header in the request.
// This causes the HTTP server to end a 100-continue response
// immediately after receiving the HTTP header.  The client
// (Chilkat) will receive this intermediate response, and if
// it's not an error response, it knows that the HTTP server will
// accept the data that is forthcoming.
// The alternative is to get an error response after trying to upload
// the entire contents of the files.
[req AddHeader: @"Expect" value: @"100-continue"];

// Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
// To allow Chilkat to determine the content-type automatically based on file-extension,
// call AddFileForUpload instead.

// The 1st arg is the filename passed in the HTTP request.
// The 2nd arg is the path in the local filesytem.
// The file is not loaded into memory.  It is streamed directly from the file
// when the HTTP POST is sent.
BOOL success = [req AddFileForUpload2: @"starfish.jpg" path: @"c:/qa_data/starfish.jpg" contentType: @"image/jpg"];
if (success != YES) {
    NSLog(@"%@",req.LastErrorText);
    return;
}

success = [req AddFileForUpload: @"something.pdf" path: @"c:/qa_data/something.pdf"];
if (success != YES) {
    NSLog(@"%@",req.LastErrorText);
    return;
}

// Its also possible to add a file from a string:
success = [req AddStringForUpload: @"test.xml" filename: @"test.xml" strData: @"<abc>This is the test.xml content</abc>" charset: @"utf-8"];
// We'll assume success since no files are involved..

// This sends the HTTP request (with 3 files being uploaded) to
// http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
CkoHttpResponse *resp = 0;
resp = [http SynchronousRequest: @"www.mywebserver123abc.com" port: [NSNumber numberWithInt: 80] ssl: NO req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
}
else {
    NSLog(@"%@%d",@"HTTP response status: ",[resp.StatusCode intValue]);
    // See the online reference documentation for 
    // other information that can be obtained from the response object.

}

// To send using SSL/TLS, do this instead.
// This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
resp = [http SynchronousRequest: @"www.mywebserver123abc.com" port: [NSNumber numberWithInt: 443] ssl: YES req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
}
else {
    NSLog(@"%@%d",@"HTTP response status: ",[resp.StatusCode intValue]);
    // See the online reference documentation for 
    // other information that can be obtained from the response object.

}