Objective-C

REST Upload Bandwidth Throttle

See more REST Examples

Demonstrates how to use upload bandwidth throttling with the REST API. This example will upload a file to Drobox using a file stream, with a limit on the bandwidth that can be used for the transfer. Objective-C

#import <CkoSocket.h>
#import <CkoRest.h>
#import <CkoJsonObject.h>
#import <CkoStream.h>
#import <NSString.h>
#import <CkoDateTime.h>
#import <CkoDtObj.h>

BOOL success = NO;

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

// A Dropbox access token should have been previously obtained.
// Dropbox access tokens do not expire.
// See Dropbox Access Token.

// To use bandwidth throttling, the connection should be made using the socket API.
// This provides numerous properties to customize the connection, such as
// BandwidthThrottleDown, BandwidthThrottleUp, ClientIpAddress, ClintPort, Http Proxy,
// KeepAlive, PreferIpv6, RequireSslCertVerify, SoRcvBuf, SoSndBuf, SoReuseAddr,
// SOCKS proxy, TcpNoSDelay, TlsPinSet, TlsCipherSuite, SslAllowedCiphers, etc.

CkoSocket *socket = [[CkoSocket alloc] init];
int maxWaitMs = 5000;
success = [socket Connect: @"content.dropboxapi.com" port: [NSNumber numberWithInt: 443] ssl: YES maxWaitMs: [NSNumber numberWithInt: maxWaitMs]];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    NSLog(@"%@%d",@"Connect Fail Reason: ",[socket.ConnectFailReason intValue]);
    return;
}

// Set the upload bandwidth throttle rate to 50000 bytes per second.
socket.BandwidthThrottleUp = [NSNumber numberWithInt:50000];

CkoRest *rest = [[CkoRest alloc] init];

// Tell the REST object to use the connected socket.
[rest UseConnection: socket autoReconnect: YES];

// The remainder of this example is identical to the example at:
// Dropbox File Stream Upload.

// Add request headers.
[rest AddHeader: @"Content-Type" value: @"application/octet-stream"];
[rest AddHeader: @"Authorization" value: @"Bearer DROPBOX_ACCESS_TOKEN"];

// The upload "parameters" contained in JSON passed in an HTTP request header.
// This is the JSON to be added in this example:
// { 
//    "path": "/Homework/lit/hamlet.xml",
//    "mode": "add",
//    "autorename": true,
//    "mute": false
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json AppendString: @"path" value: @"/Homework/lit/hamlet.xml"];
[json AppendString: @"mode" value: @"add"];
[json AppendBool: @"autorename" value: YES];
[json AppendBool: @"mute" value: NO];
[rest AddHeader: @"Dropbox-API-Arg" value: [json Emit]];

// Almost ready to go...
// Let's setup a file stream to point to a file.
CkoStream *fileStream = [[CkoStream alloc] init];
fileStream.SourceFile = @"qa_data/xml/hamlet.xml";

// Do the upload.  The URL is https://content.dropboxapi.com/2/files/upload.
// We already connected to content.dropboxapi.com using TLS (i.e. HTTPS),
// so now we only need to specify the path "/2/files/upload".

// Note: The file is streamed directly from disk.  (The entire
// file will not be loaded into memory.)
NSString *responseStr = [rest FullRequestStream: @"POST" uriPath: @"/2/files/upload" stream: fileStream];
if (rest.LastMethodSuccess == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// When successful, Dropbox responds with a 200 response code.
if ([rest.ResponseStatusCode intValue] != 200) {
    // Examine the request/response to see what happened.
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response body (if any): ",responseStr);
    NSLog(@"%@",@"---");
    NSLog(@"%@%@",@"LastRequestStartLine: ",rest.LastRequestStartLine);
    NSLog(@"%@%@",@"LastRequestHeader: ",rest.LastRequestHeader);
    return;
}

// The response is JSON.
CkoJsonObject *jsonResp = [[CkoJsonObject alloc] init];
jsonResp.EmitCompact = NO;
[jsonResp Load: responseStr];

// Show the JSON response.
NSLog(@"%@",[jsonResp Emit]);

// Returns JSON that looks like this:
// { 
//   "name": "hamlet.xml",
//   "path_lower": "/homework/lit/hamlet.xml",
//   "path_display": "/Homework/lit/hamlet.xml",
//   "id": "id:74FkdeNuyKAAAAAAAAAAAQ",
//   "client_modified": "2016-06-02T23:19:00Z",
//   "server_modified": "2016-06-02T23:19:00Z",
//   "rev": "9482db15f",
//   "size": 279658
// }

// Sample code to get data from the JSON response:
int size = [[jsonResp IntOf: @"size"] intValue];
NSLog(@"%@%d",@"size = ",size);

NSString *rev = [jsonResp StringOf: @"rev"];
NSLog(@"%@%@",@"rev = ",rev);

NSString *clientModified = [jsonResp StringOf: @"client_modified"];
CkoDateTime *ckdt = [[CkoDateTime alloc] init];
[ckdt SetFromTimestamp: clientModified];
BOOL bLocalTime = YES;
CkoDtObj *dt = [[CkoDtObj alloc] init];
[ckdt ToDtObj: bLocalTime dtObj: dt];

NSLog(@"%d%@%d%@%d%@%d%@%d",[dt.Day intValue],@"/",[dt.Month intValue],@"/",[dt.Year intValue],@" ",[dt.Hour intValue]
    ,@":",[dt.Minute intValue]);