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(Visual Basic 6.0) Azure File Service: Upload File

Sample code to upload a file to a directory in a share in the Azure File Service. A file is uploaded by first creating the file in the Azure share and then writes a range of bytes to the file. Azure imposes a 4MB limit for each PUT to write a range. Files larger than 4MB need to be uploaded by making multiple "Put Range" calls. This example uploads a file small enough for a single "Put Range" call.

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ActiveX for 32-bit and 64-bit Windows

'  Azure File Service Example: Upload a file.
'  See:  https://docs.microsoft.com/en-us/rest/api/storageservices/create-share
'  also see: https://docs.microsoft.com/en-us/rest/api/storageservices/put-range

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

Dim rest As New ChilkatRest

'  Connect to the Azure Storage Blob Service
Dim bTls As Long
bTls = 1
Dim port As Long
port = 443
Dim bAutoReconnect As Long
bAutoReconnect = 1
'  In this example, the storage account name is "chilkat".
Dim success As Long
success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

'  This example will upload a relatively small file (760K), so it may as well
'  just be load it into memory..
Dim jpgData As New ChilkatBinData
success = jpgData.LoadFile("qa_data/jpg/penguins.jpg")

'  Provide Azure Cloud credentials for the REST calls.
Dim azAuth As New ChilkatAuthAzureStorage
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: 2015-02-21" header to be automatically added.
azAuth.XMsVersion = "2015-02-21"
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.

'  However, a few additional headers are required for the "Create File" operation:
success = rest.AddHeader("x-ms-type","file")

'  This required header specifies the final size of the file (or the maximum size it can be).
Dim sbFileSize As New ChilkatStringBuilder
success = sbFileSize.AppendInt(jpgData.NumBytes)
success = rest.AddHeader("x-ms-content-length",sbFileSize.GetAsString())

'  Send a PUT request to create the file (or replace the file if it already exists).
'  This will initialize the file in the Azure file storage.  To upload content, we'll need
'  to do the "Put Range" operation one or more times.

'  The following will create the file "penguins.jpg" in the share "pip", in the directory "/wildlife/antarctic"
Dim responseStr As String
responseStr = rest.FullRequestNoBody("PUT","/pip/wildlife/antarctic/penguins.jpg")
If (rest.LastMethodSuccess <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

'  When successful, the Azure File Service will respond with a 201 (Created) response status code,
'  with no XML response body.  If an error response is returned, there will be an XML response body.

If (rest.ResponseStatusCode <> 201) Then
    '  Examine the request/response to see what happened.
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "response body (if any): " & responseStr
    Debug.Print "---"
    Debug.Print "LastRequestStartLine: " & rest.LastRequestStartLine
    Debug.Print "LastRequestHeader: " & rest.LastRequestHeader
    Exit Sub
End If

Debug.Print "Successfully created penguins.jpg"

'  --------------------------------------------------------------------------------
'  Upload the file data...

'  Make sure the headers from the "Create File" operation are removed.
success = rest.ClearAllHeaders()

'  The only tricky part here is to correctly add the x-ms-range header.
'  It will be formatted like this:
'  x-ms-range: bytes=0-759623

Dim sbRange As New ChilkatStringBuilder
success = sbRange.Append("bytes=0-")
success = sbRange.AppendInt(jpgData.NumBytes - 1)

success = rest.AddHeader("x-ms-range",sbRange.GetAsString())

'  The x-ms-write header is also required:
success = rest.AddHeader("x-ms-write","update")

Dim sbResponseBody As New ChilkatStringBuilder
success = rest.FullRequestBd("PUT","/pip/wildlife/antarctic/penguins.jpg?comp=range",jpgData,sbResponseBody)
If (success <> 1) Then
    '  This would indicate a failure where no response was received.
    Debug.Print rest.LastErrorText
    Exit Sub
End If

'  A 201 response indicates the data was uploaded.
If (rest.ResponseStatusCode <> 201) Then
    '  Examine the request/response to see what happened.
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "response body (if any): " & responseStr
    Debug.Print "---"
    Debug.Print "LastRequestStartLine: " & rest.LastRequestStartLine
    Debug.Print "LastRequestHeader: " & rest.LastRequestHeader
    Exit Sub
End If

Debug.Print "Successfully uploaded data into penguins.jpg"

 

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