Xbase++

REST File Streaming Upload

See more Azure Cloud Storage Examples

Demonstrates how to stream the REST body from a file. This example demonstrates a REST upload to the Azure Cloud Storage service. Xbase++

LOCAL nSuccess
LOCAL oRest
LOCAL nBTls
LOCAL nPort
LOCAL nBAutoReconnect
LOCAL oAzAuth
LOCAL oFileStream
LOCAL cResponseStr

nSuccess := 0

//  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.blob.core.windows.net", nPort, nBTls, nBAutoReconnect)
IF (nSuccess != 1)
    ? oRest:LastErrorText
    oRest:destroy()
    RETURN
ENDIF

//  Provide Azure Cloud credentials for the REST call.
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 := "Blob"
//  This causes the "x-ms-version: 2021-08-06" header to be automatically added.
oAzAuth:XMsVersion := "2021-08-06"
nSuccess := oRest:SetAuthAzureStorage(oAzAuth)

//  Set some request headers.
nSuccess := oRest:AddHeader("x-ms-blob-content-disposition", 'attachment; filename="hamlet.xml"')
nSuccess := oRest:AddHeader("x-ms-blob-type", "BlockBlob")
nSuccess := oRest:AddHeader("x-ms-meta-m1", "v1")
nSuccess := oRest:AddHeader("x-ms-meta-m2", "v2")

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

oFileStream := CreateObject("Chilkat.Stream")
oFileStream:SourceFile := "qa_data/xml/hamlet.xml"

//  Upload to the Azure Cloud Storage service.
//  The file is streamed, so the full file never has to completely reside in memory.
//  The file is uploaded to the container named "test".
cResponseStr := oRest:FullRequestStream("PUT", "/test/hamlet.xml", oFileStream)
IF (oRest:LastMethodSuccess != 1)
    ? oRest:LastErrorText
    oRest:destroy()
    oAzAuth:destroy()
    oFileStream:destroy()
    RETURN
ENDIF

//  When successful, the Azure Storage service will respond with a 201 response code,
//  with an empty body.  Therefore, in the success condition, the responseStr is empty.
IF (oRest:ResponseStatusCode == 201)
    ? "File uploaded."
ELSE
    //  Examine the request/response to see what happened.
    ? "response status code = " + Str(oRest:ResponseStatusCode)
    ? "response status text = " + oRest:ResponseStatusText
    ? "response header: " + oRest:ResponseHeader
    ? "response body (if any): " + cResponseStr
    ? "---"
    ? "LastRequestStartLine: " + oRest:LastRequestStartLine
    ? "LastRequestHeader: " + oRest:LastRequestHeader
ENDIF

oRest:destroy()
oAzAuth:destroy()
oFileStream:destroy()