Visual FoxPro

Azure Storage: Download Blob to File

See more Azure Cloud Storage Examples

Sample code to download an Azure blob to a file. Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAzAuth
LOCAL loFileStream
LOCAL lnExpectedStatus
LOCAL lcResponseStr

lnSuccess = 0

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

loRest = CreateObject('Chilkat.Rest')

*  Connect to the Azure Storage Blob Service
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
*  In this example, the storage account name is "chilkat".
lnSuccess = loRest.Connect("chilkat.blob.core.windows.net",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

*  Provide Azure Cloud credentials for the REST call.
loAzAuth = CreateObject('Chilkat.AuthAzureStorage')
loAzAuth.AccessKey = "AZURE_ACCESS_KEY"
*  The account name used here should match the 1st part of the domain passed in the call to Connect (above).
loAzAuth.Account = "chilkat"
loAzAuth.Scheme = "SharedKey"
loAzAuth.Service = "Blob"
*  This causes the "x-ms-version: 2021-08-06" header to be automatically added.
loAzAuth.XMsVersion = "2021-08-06"
lnSuccess = loRest.SetAuthAzureStorage(loAzAuth)

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

*  Setup a file stream for the download
loFileStream = CreateObject('Chilkat.Stream')
loFileStream.SinkFile = "C:/temp/qa_output/starfish.jpg"

*  Indicate that the call to FullRequestNoBody should send the response body
*  to fileStream if the response status code is 200.
*  If a non-success response status code is received, then nothing
*  is streamed to the output file and the error response is returned by FullRequestNoBody.
lnExpectedStatus = 200
loRest.SetResponseBodyStream(lnExpectedStatus,1,loFileStream)

*  The Azure blob container is "test", the file is "starfish.jpg"
lcResponseStr = loRest.FullRequestNoBody("GET","/test/starfish.jpg")
IF (loRest.LastMethodSuccess <> 1) THEN

    *  Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body (if any): " + lcResponseStr
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loFileStream
    CANCEL
ENDIF

? "Success."

RELEASE loRest
RELEASE loAzAuth
RELEASE loFileStream