Objective-C

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Objective-C

#import <CkoRest.h>
#import <CkoAuthAzureStorage.h>
#import <CkoBinData.h>
#import <CkoStringBuilder.h>

BOOL success = NO;

// Azure File Service Example: Download a Binary File to Memory
// See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

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

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

// Connect to the Azure Storage Blob Service
BOOL bTls = YES;
int port = 443;
BOOL bAutoReconnect = YES;
// In this example, the storage account name is "chilkat".
success = [rest Connect: @"chilkat.file.core.windows.net" port: [NSNumber numberWithInt: port] tls: bTls autoReconnect: bAutoReconnect];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST calls.
CkoAuthAzureStorage *azAuth = [[CkoAuthAzureStorage alloc] init];
azAuth.AccessKey = @"AZURE_ACCESS_KEY";
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = @"chilkat";
azAuth.Scheme = @"SharedKey";
azAuth.Service = @"File";
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = @"2021-08-06";
success = [rest SetAuthAzureStorage: azAuth];

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// Send a GET request to download the file "penguins.jpg" to a BinData object.
// (The share name is "pip")
CkoBinData *bdFileContents = [[CkoBinData alloc] init];
success = [rest FullRequestNoBodyBd: @"GET" uriPath: @"/pip/wildlife/antarctic/penguins.jpg" binData: bdFileContents];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// When successful, the response status will be 200.
// If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
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);
    CkoStringBuilder *sbXmlErr = [[CkoStringBuilder alloc] init];
    [sbXmlErr AppendBd: bdFileContents charset: @"utf-8" offset: [NSNumber numberWithInt: 0] numBytes: [NSNumber numberWithInt: 0]];
    NSLog(@"%@%@",@"response body (if any): ",[sbXmlErr GetAsString]);
    NSLog(@"%@",@"---");
    NSLog(@"%@%@",@"LastRequestStartLine: ",rest.LastRequestStartLine);
    NSLog(@"%@%@",@"LastRequestHeader: ",rest.LastRequestHeader);
    return;
}

NSLog(@"%@%d",@"Size of the downloaded file = ",[bdFileContents.NumBytes intValue]);

// See the online reference documentation for the BinData class for ways
// to access the bytes.

[bdFileContents WriteFile: @"qa_output/penguins.jpg"];