Visual FoxPro

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAzAuth
LOCAL loBdFileContents
LOCAL loSbXmlErr

lnSuccess = 0

* 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.

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.file.core.windows.net",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

* Provide Azure Cloud credentials for the REST calls.
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 = "File"
* 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: 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")
loBdFileContents = CreateObject('Chilkat.BinData')
lnSuccess = loRest.FullRequestNoBodyBd("GET","/pip/wildlife/antarctic/penguins.jpg",loBdFileContents)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loBdFileContents
    CANCEL
ENDIF

* 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 (loRest.ResponseStatusCode <> 200) THEN
    * Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    loSbXmlErr = CreateObject('Chilkat.StringBuilder')
    loSbXmlErr.AppendBd(loBdFileContents,"utf-8",0,0)
    ? "response body (if any): " + loSbXmlErr.GetAsString()
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loBdFileContents
    RELEASE loSbXmlErr
    CANCEL
ENDIF

? "Size of the downloaded file = " + STR(loBdFileContents.NumBytes)

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

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

RELEASE loRest
RELEASE loAzAuth
RELEASE loBdFileContents
RELEASE loSbXmlErr