IPWorks Cloud 2020 Delphi Edition

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ListBlobs Method

Lists the blobs in a container.

procedure ListBlobs();

Remarks

This method lists the blobs in the container currently selected by Container.

Before calling this method, the Prefix property may be set in order to restrict the results to only the items whose names begin with a given string. The MaxResults configuration setting may also be used to limit the number of results returned. The following properties and configuration settings can also be used to further tune the results returned; refer to their documentation for more information:

Calling this method will fire the BlobList event once for each blob, and will also populate the Blob* properties. It may also fire the PrefixList and MetadataList events, and populate the PrefixCount and Prefix[i] configuration settings, depending on how the properties and configuration settings discussed above are set.

If there are still more blobs available to list when this method returns, the BlobMarker property will be populated. Continue to call this method until BlobMarker is empty to accumulate all pages of results in the Blob* properties.

Blob Namespace Traversal

By using the BlobDelimiter and Prefix properties in tandem, applications can effectively "traverse" a virtual hierarchy of blobs as if it were a filesystem. For example, assume that blobs with the following names exist within a container:

  • MyCompany
  • MyCompany/Department1
  • MyCompany/Department2
  • MyCompany/Department2/EmployeeA
  • MyCompany/Department2/EmployeeB

With BlobDelimiter set to /, we can set Prefix to successively "deeper" values before calling ListBlobs for the following effect:

Prefix Value Blobs Returned Prefixes Returned
(empty) MyCompany MyCompany/
MyCompany/ MyCompany/Department1
MyCompany/Department2
MyCompany/Department2/
MyCompany/Department2/ MyCompany/Department2/EmployeeA
MyCompany/Department2/EmployeeB
(none)

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IPWorks Cloud 2020 Delphi Edition - Version 20.0 [Build 8265]