Xbase++

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Xbase++

LOCAL nSuccess
LOCAL oRest
LOCAL nBTls
LOCAL nPort
LOCAL nBAutoReconnect
LOCAL oAzAuth
LOCAL oBdFileContents
LOCAL oSbXmlErr

nSuccess := 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.

oRest := CreateObject("Chilkat.Rest")

//  Connect to the Azure Storage Blob Service
nBTls := 1
nPort := 443
nBAutoReconnect := 1
//  In this example, the storage account name is "chilkat".
nSuccess := oRest:Connect("chilkat.file.core.windows.net", nPort, nBTls, nBAutoReconnect)
IF (nSuccess == 0)
    ? oRest:LastErrorText
    oRest:destroy()
    RETURN
ENDIF

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

//  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")
oBdFileContents := CreateObject("Chilkat.BinData")
nSuccess := oRest:FullRequestNoBodyBd("GET", "/pip/wildlife/antarctic/penguins.jpg", oBdFileContents)
IF (nSuccess == 0)
    ? oRest:LastErrorText
    oRest:destroy()
    oAzAuth:destroy()
    oBdFileContents:destroy()
    RETURN
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 (oRest:ResponseStatusCode != 200)
    //  Examine the request/response to see what happened.
    ? "response status code = " + Str(oRest:ResponseStatusCode)
    ? "response status text = " + oRest:ResponseStatusText
    ? "response header: " + oRest:ResponseHeader
    oSbXmlErr := CreateObject("Chilkat.StringBuilder")
    oSbXmlErr:AppendBd(oBdFileContents, "utf-8", 0, 0)
    ? "response body (if any): " + oSbXmlErr:GetAsString()
    ? "---"
    ? "LastRequestStartLine: " + oRest:LastRequestStartLine
    ? "LastRequestHeader: " + oRest:LastRequestHeader
    oRest:destroy()
    oAzAuth:destroy()
    oBdFileContents:destroy()
    oSbXmlErr:destroy()
    RETURN
ENDIF

? "Size of the downloaded file = " + Str(oBdFileContents:NumBytes)

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

oBdFileContents:WriteFile("qa_output/penguins.jpg")

oRest:destroy()
oAzAuth:destroy()
oBdFileContents:destroy()
oSbXmlErr:destroy()