Objective-C program upload file to Azure Blob Storage with progress indicator

Main.m

#import <AZSClient/AZSClient.h>

NSString *const AZURE_STORAGE_CONNECTION_STRING = @"DefaultEndpointsProtocol=https;AccountName=(your account name);AccountKey=(your account key);EndpointSuffix=core.windows.net";
NSString *const AZURE_STORAGE_CONTAINER = @"files";
NSString *const LOCAL_FILE_FILEPATH = @"/Users/dino/A.mp4";
NSString *const LOCAL_FILE_FILENAME = @"A.mp4";

NSError *error;
AZSCloudStorageAccount *account = [AZSCloudStorageAccount accountFromConnectionString:AZURE_STORAGE_CONNECTION_STRING error:&error];
AZSCloudBlobClient *client = [account getBlobClient];
AZSCloudBlobContainer *container = [client containerReferenceFromName:AZURE_STORAGE_CONTAINER];

[container createContainerIfNotExistsWithCompletionHandler:^(NSError *error, BOOL exists) {
    @autoreleasepool {
        AZSCloudBlockBlob *blob = [container blockBlobReferenceFromName:LOCAL_FILE_FILENAME];
        
        NSUInteger size = [[[NSFileManager defaultManager] attributesOfItemAtPath:LOCAL_FILE_FILEPATH error:&error] fileSize];
        
        NSInputStream *stream = [NSInputStream inputStreamWithFileAtPath:LOCAL_FILE_FILEPATH];
        
        AZSOperationContext *operationContext = [[AZSOperationContext alloc] init];
        operationContext.sendingRequest = ^(NSMutableURLRequest *request, AZSOperationContext *context) {
            NSNumber *number = [stream propertyForKey:NSStreamFileCurrentOffsetKey];
            if (number != nil) {
                NSUInteger pos = [number longValue];
                float percentage = ((float)pos / size) * 100;
                NSLog(@"current %ld of %ld, %f%% completed", pos, size, percentage);
            }
        };
        
        NSLog(@"upload started.");
        
        [blob uploadFromStream:stream accessCondition:nil requestOptions:nil operationContext:operationContext completionHandler:^(NSError *error) {
             NSLog(@"upload done.");
             exit(0);
        }];
    }
}];

Does this approach handle loss in Internet connection or App switching in iOS?

Hi @jthake
This approach doesn't change AZSClient's behavior. Just used for watching upload progress by stream current offset.

The NSNumber number is returning nil. What could cause such a problem? I just started using this code and I have no time to search for the problem so if anyone has faced such an issue or could help please do.

Does this approach handle loss in Internet connection or App switching in iOS?

Did you have a problem with the streamfilecurrentoffset variable? It is returning nil for me.