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(Xojo Plugin) Streaming Download Large File to the Local Filesystem

Downloads a large file in a streaming fashion to the local filesystem.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

//  Azure File Service Example: Downloads a large file to the local filesystem using a Chilkat stream.
//  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 New Chilkat.Rest

//  Connect to the Azure Storage Blob Service
Dim bTls As Boolean
bTls = True
Dim port As Int32
port = 443
Dim bAutoReconnect As Boolean
bAutoReconnect = True
//  In this example, the storage account name is "chilkat".
Dim success As Boolean
success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

//  Provide Azure Cloud credentials for the REST calls.
Dim azAuth As New Chilkat.AuthAzureStorage
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.

//  When streaming a download to the local filesystem or directed elsewhere,
//  the complete HTTP GET operation must be broken into parts.
//  For example, an HTTP GET consists of sending the request, followed by reading the response header,
//  and then finally the response body.  We'll want to read the response header, and then based
//  on the information received (such as success or failure), either read the response body
//  as an error message, or as the file data.

//  Send the HTTP GET request to download the file.
//  The share is named "pip".
success = rest.SendReqNoBody("GET","/pip/somethingBig.zip")
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

//  Read the response header.
Dim responseStatusCode As Int32
responseStatusCode = rest.ReadResponseHeader()
If (responseStatusCode < 0) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

System.DebugLog("Response status code = " + Str(responseStatusCode))

//  We expect a 200 response status if the file data is coming.
//  Otherwise, we'll get a string response body with an error message(or no response body).
If (responseStatusCode = 200) Then

    Dim bodyStream As New Chilkat.Stream

    //  The stream's sink will be a file.
    bodyStream.SinkFile = "qa_output/somethingBig.zip"

    //  Read the response body to the stream.  Given that we've
    //  set the stream's sink to a file, it will stream directly
    //  to the file.
    success = rest.ReadRespBodyStream(bodyStream,True)
    If (success <> True) Then
        System.DebugLog(rest.LastErrorText)
        Return
    End If

    System.DebugLog("Successfully received the large file.")

Else
    Dim errResponse As String
    errResponse = rest.ReadRespBodyString()
    If (rest.LastMethodSuccess <> True) Then
        System.DebugLog(rest.LastErrorText)
    Else
        System.DebugLog(errResponse)
    End If

End If


 

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