B4X

REST File Streaming Upload

See more Azure Cloud Storage Examples

Demonstrates how to stream the REST body from a file. This example demonstrates a REST upload to the Azure Cloud Storage service. B4X

Dim success As Boolean = False

'  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.blob.core.windows.net", port, bTls, bAutoReconnect)
If success <> True Then
    Log(rest.LastErrorText)
    Return
End If


'  Provide Azure Cloud credentials for the REST call.
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 = "Blob"
'  This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = "2021-08-06"
success = rest.SetAuthAzureStorage(azAuth)

'  Set some request headers.
success = rest.AddHeader("x-ms-blob-content-disposition", "attachment; filename=" & Chr(34) & "hamlet.xml" & Chr(34))
success = rest.AddHeader("x-ms-blob-type", "BlockBlob")
success = rest.AddHeader("x-ms-meta-m1", "v1")
success = rest.AddHeader("x-ms-meta-m2", "v2")

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

Dim fileStream As ChilkatStream
fileStream.Initialize("fileStream")
fileStream.SourceFile = "qa_data/xml/hamlet.xml"

'  Upload to the Azure Cloud Storage service.
'  The file is streamed, so the full file never has to completely reside in memory.
'  The file is uploaded to the container named "test".
Dim responseStr As String = rest.FullRequestStream("PUT", "/test/hamlet.xml", fileStream)
If rest.LastMethodSuccess <> True Then
    Log(rest.LastErrorText)
    Return
End If


'  When successful, the Azure Storage service will respond with a 201 response code,
'  with an empty body.  Therefore, in the success condition, the responseStr is empty.
If rest.ResponseStatusCode = 201 Then
    Log("File uploaded.")
Else
    '  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)
    Log("response body (if any): " & responseStr)
    Log("---")
    Log("LastRequestStartLine: " & rest.LastRequestStartLine)
    Log("LastRequestHeader: " & rest.LastRequestHeader)
End If