ReadFromBlobStorage

Downloads content from Azure Blob Storage for the current tenant.

Syntax

ReadFromBlobStorage(path, fileName)

Parameters

• path (string): Path within the container (e.g., "exports/reports")
• fileName (string): Name of the file (e.g., "data.json")

Returns

• array: File content as a byte array, or null if not found or on error

Description

Downloads a file from the tenant’s Azure Blob Storage account. The returned byte array can be:

• Passed directly to WriteToBlobStorage for copying files
• Converted to string for JSON/text files
• Processed as binary data

Examples

Read JSON File

var content = ReadFromBlobStorage("config", "settings.json")

if content != null then
    # Convert byte array to string (for JSON/text files)
    var jsonString = BytesToString(content)
    var settings = ParseJson(jsonString)
    Log("Information", "Loaded settings: " + settings.version)
else
    Log("Warning", "Settings file not found")
end

Check File Existence Before Reading

if BlobStorageExists("exports", "report.xlsx") then
    var content = ReadFromBlobStorage("exports", "report.xlsx")
    Log("Information", "Downloaded file with " + content.length + " bytes")
else
    Log("Information", "File does not exist")
end

Copy File to New Location

# Read from source
var content = ReadFromBlobStorage("exports/2024/01", "report.xlsx")

if content != null then
    # Write to destination
    var success = WriteToBlobStorage("archive", "report_archived.xlsx", content)
    if success then
        Log("Information", "File copied successfully")
    end
end

Process Multiple Files

# List and process all JSON files
var files = ListBlobStorage("data", "*.json")

foreach file in files do
    var content = ReadFromBlobStorage("data", file.name)
    if content != null then
        var jsonString = BytesToString(content)
        var data = ParseJson(jsonString)
        # Process data...
        Log("Information", "Processed: " + file.name)
    end
end

Notes

• Returns null if the file doesn’t exist or blob storage is not enabled
• For large files, consider using GetBlobStorageSasUrl instead to generate a download link
• Byte arrays can be large - avoid storing in notepads or logging
• Blob storage must be enabled for the tenant (see IsBlobStorageEnabled)