(Lianja) Azure Storage: Upload Empty File to Block Blob

Demonstrates how to create an empty block blob in Azure Storage.

Chilkat Lianja Extension Download Chilkat Lianja Extension

// Azure Blob Service Example: Demonstrates how to create an empty block blob.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

// 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.blob.core.windows.net",lnPort,llBTls,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

// Provide Azure Cloud credentials for the REST call.
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 = "Blob"
// This causes the "x-ms-version: 2020-08-04" header to be automatically added.
loAzAuth.XMsVersion = "2020-08-04"
llSuccess = 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.

// IMPORTANT: Make sure to set the x-ms-blob-type header:
llSuccess = loRest.AddHeader("x-ms-blob-type","BlockBlob")

// To create an empty blob, upload a zero-length string.
lcResponseStr = loRest.FullRequestString("PUT","/mycontainer/empty.txt","")
if (loRest.LastMethodSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loAzAuth
    return
endif

// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.

if (loRest.ResponseStatusCode <> 201) 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
    return
endif

? "Success."


release loRest
release loAzAuth