Lianja

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Lianja

llSuccess = .F.

// 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("CkRest")

// Connect to the Azure Storage Blob Service
llBTls = .T.
lnPort = 443
llBAutoReconnect = .T.
// In this example, the storage account name is "chilkat".
llSuccess = loRest.Connect("chilkat.file.core.windows.net",lnPort,llBTls,llBAutoReconnect)
if (llSuccess = .F.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

// Provide Azure Cloud credentials for the REST calls.
loAzAuth = createobject("CkAuthAzureStorage")
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"
llSuccess = 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("CkBinData")
llSuccess = loRest.FullRequestNoBodyBd("GET","/pip/wildlife/antarctic/penguins.jpg",loBdFileContents)
if (llSuccess = .F.) then
    ? loRest.LastErrorText
    release loRest
    release loAzAuth
    release loBdFileContents
    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 (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("CkStringBuilder")
    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
    return
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