Dart

Azure Storage: Upload Contents of String Variable to Block Blob

See more Azure Cloud Storage Examples

Sample code to upload the contents of a string variable to a block blob in Azure Cloud Storage. This creates the block blob, or replaces an existing block blob.

Note: The maximum size of a block blob created by uploading in a single step is 64MB. For larger files, the upload must be broken up into blocks. There is another Chilkat example for that..

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Azure Blob Service Example: Upload the contents of a string variable to a block blob.
  // This creates a new block blob or replaces an existing one in its entirety.
  // See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

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

  final rest = CkRest();

  // Connect to the Azure Storage Blob Service
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  // In this example, the storage account name is "chilkat".
  try {
    rest.connect('chilkat.blob.core.windows.net', port, bTls, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Provide Azure Cloud credentials for the REST call.
  final azAuth = CkAuthAzureStorage();
  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 = 'Blob';
  // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
  azAuth.xMsVersion = '2021-08-06';
  rest.setAuthAzureStorage(azAuth);

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

  // IMPORTANT: Make sure to set the x-ms-blob-type header:
  rest.addHeader('x-ms-blob-type', 'BlockBlob');

  // After uploading, the block blob named helloWorld.txt (in the container named "mycontainer")
  // will contain the following string:
  final blobContents = 'Hello World!';

  // Note: The maximum size of a block blob created by uploading in a single step is 64MB.  
  // For larger files, the upload must be broken up into blocks.  There is another Chilkat example for that..
  final String responseStr;
  try {
    responseStr = rest.fullRequestString('PUT', '/mycontainer/helloWorld.txt', blobContents);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // When successful, the Azure Storage service will respond with a 201 response status code,
  // with no response body.

  if (rest.responseStatusCode != 201) {
    // Examine the request/response to see what happened.
    print('response status code = ${rest.responseStatusCode}');
    print('response status text = ${rest.responseStatusText}');
    print('response header: ${rest.responseHeader}');
    print('response body (if any): $responseStr');
    print('---');
    print('LastRequestStartLine: ${rest.lastRequestStartLine}');
    print('LastRequestHeader: ${rest.lastRequestHeader}');
    return;
  }

  print('Success.');
}