(Objective-C) SharePoint -- Update the Contents of a File (PUT)

Demonstrates how to update the contents of a SharePoint file.

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

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

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

// If SharePoint Windows classic authentication is used, then set the 
// Login, Password, LoginDomain, and NtlmAuth properties.
http.Login = @"SHAREPOINT_USERNAME";
http.Password = @"SHAREPOINT_PASSWORD";
http.LoginDomain = @"SHAREPOINT_NTLM_DOMAIN";
http.NtlmAuth = YES;

// The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
// If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
// establish the cookie as shown at SharePoint Online Authentication

// Indicate that we want a JSON reply
http.Accept = @"application/json;odata=verbose";

// Update /Documents/ChilkatTest/sample.docx with new content...
CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
req.HttpVerb = @"POST";
req.Path = @"/_api/web/GetFileByServerRelativeUrl('/Documents/ChilkatTest/sample.docx')/$value";
// Give the location of the file to be uploaded.  
// Note: The file is not loaded into memory at this point.  It is never fully loaded
// into memory.  Instead, the file data is streamed directly from the file when
// when the upload occurs.
[req StreamBodyFromFile: @"qa_data/msword/sample.docx"];

// We need to add a form digest value in the X-RequestDigest header field.
// See this example for details on
// how to get (and cache) a form digest value
[req AddHeader: @"X-RequestDigest" value: @"SHAREPOINT_FORM_DIGEST"];

// Also need to add this header..
[req AddHeader: @"X-HTTP-Method" value: @"PUT"];

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

// A successful update will return a 204 status code with an empty body.
// A non-successful update will return a JSON response body..
if ([resp.StatusCode intValue] != 204) {
    NSLog(@"%@%d",@"Response status code = ",[resp.StatusCode intValue]);
    CkoJsonObject *json = [[CkoJsonObject alloc] init];
    [json Load: resp.BodyStr];
    json.EmitCompact = NO;
    NSLog(@"%@",[json Emit]);
    NSLog(@"%@",@"Failed");

    return;
}

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