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Objective-C Examples

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(Objective-C) Upload Binary File from Memory

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing.

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoJsonObject.h>
#import <CkoCache.h>
#import <NSString.h>
#import <CkoJsonArray.h>
#import <CkoFileAccess.h>

BOOL success = YES;

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

//  This example uses a previously obtained access token having permission for the
//  Google Drive scope.

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];
gAuth.AccessToken = @"GOOGLE-DRIVE-ACCESS-TOKEN";

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

//  Connect using TLS.
BOOL bAutoReconnect = YES;
success = [rest Connect: @"www.googleapis.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];

//  Provide the authentication credentials (i.e. the access token)
[rest SetAuthGoogle: gAuth];

//  -------------------------------------------------------------------------
//  A multipart upload to Google Drive needs a multipart/related Content-Type
[rest AddHeader: @"Content-Type" value: @"multipart/related"];

//  Specify each part of the request.

//  The 1st part is JSON with information about the file.
rest.PartSelector = @"1";
[rest AddHeader: @"Content-Type" value: @"application/json; charset=UTF-8"];

//  Construct the JSON that will contain the metadata about the file data to be uploaded...
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json AppendString: @"name" value: @"hedgehogs.jpg"];
[json AppendString: @"description" value: @"A cute photo of two hedgehogs."];
[json AppendString: @"mimeType" value: @"image/jpeg"];

//  To place the file in a folder, we must add a parents[] array to the JSON
//  and add the folder ID.
//  In a previous example (see Build Local Metadata Cache
//  we built a local cache to make it easy to lookup file IDs given a file path.
//  Let's find the file ID for the folder "testFolder/abc/123"
CkoCache *gdCache = [[CkoCache alloc] init];
gdCache.Level = [NSNumber numberWithInt:0];
[gdCache AddRoot: @"C:/ckCache/googleDrive"];

NSString *folderId = [gdCache FetchText: @"testFolder/abc/123"];
if (gdCache.LastMethodSuccess != YES) {
    NSLog(@"%@",@"Filepath not found in cache.");
    return;
}

CkoJsonArray *parents = [json AppendArray: @"parents"];
[parents AddStringAt: [NSNumber numberWithInt: -1] value: folderId];

[rest SetMultipartBodyString: [json Emit]];

//  The 2nd part is the file content, which will contain the binary image data.
rest.PartSelector = @"2";
[rest AddHeader: @"Content-Type" value: @"image/jpeg"];

CkoFileAccess *fac = [[CkoFileAccess alloc] init];
NSData jpgBytes;
//  Read a JPG file from the local filesystem.
jpgBytes = [fac ReadEntireFile: @"qa_data/jpg/hedgehogs.jpg"];

//  Add the bytes to our upload
[rest SetMultipartBodyBinary: jpgBytes];

NSString *jsonResponse = [rest FullRequestMultipart: @"POST" uriPath: @"/upload/drive/v3/files?uploadType=multipart"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  A successful response will have a status code equal to 200.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response JSON: ",jsonResponse);
    return;
}

//  Show the JSON response.
[json Load: jsonResponse];

//  Show the full JSON response.
json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

//  A successful response looks like this:
//  {
//    "kind": "drive#file",
//    "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
//    "name": "hedgehogs.jpg",
//    "mimeType": "image/jpeg"
//  }

//  Get the fileId:
NSLog(@"%@%@",@"fileId: ",[json StringOf: @"id"]);
 

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