B4X

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. B4X

Dim success As Boolean = False

'  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.

Dim rest As ChilkatRest
rest.Initialize("rest")

'  Connect to the Azure Storage Blob Service
Dim bTls As Boolean = True
Dim port As Int = 443
Dim bAutoReconnect As Boolean = True
'  In this example, the storage account name is "chilkat".
success = rest.Connect("chilkat.file.core.windows.net", port, bTls, bAutoReconnect)
If success = False Then
    Log(rest.LastErrorText)
    Return
End If


'  Provide Azure Cloud credentials for the REST calls.
Dim azAuth As ChilkatAuthAzureStorage
azAuth.Initialize
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")
Dim bdFileContents As ChilkatBinData
bdFileContents.Initialize
success = rest.FullRequestNoBodyBd("GET", "/pip/wildlife/antarctic/penguins.jpg", bdFileContents)
If success = False Then
    Log(rest.LastErrorText)
    Return
End If


'  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 <> 200 Then
    '  Examine the request/response to see what happened.
    Log("response status code = " & rest.ResponseStatusCode)
    Log("response status text = " & rest.ResponseStatusText)
    Log("response header: " & rest.ResponseHeader)
    Dim sbXmlErr As ChilkatStringBuilder
    sbXmlErr.Initialize
    sbXmlErr.AppendBd(bdFileContents, "utf-8", 0, 0)
    Log("response body (if any): " & sbXmlErr.GetAsString)
    Log("---")
    Log("LastRequestStartLine: " & rest.LastRequestStartLine)
    Log("LastRequestHeader: " & rest.LastRequestHeader)
    Return
End If


Log("Size of the downloaded file = " & bdFileContents.NumBytes)

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

bdFileContents.WriteFile("qa_output/penguins.jpg")