Visual FoxPro

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. Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAzAuth
LOCAL loFileStream
LOCAL lcResponseStr

lnSuccess = 0

* 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.blob.core.windows.net",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

* Provide Azure Cloud credentials for the REST call.
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 = "Blob"
* This causes the "x-ms-version: 2021-08-06" header to be automatically added.
loAzAuth.XMsVersion = "2021-08-06"
lnSuccess = loRest.SetAuthAzureStorage(loAzAuth)

* Set some request headers.
lnSuccess = loRest.AddHeader("x-ms-blob-content-disposition",'attachment; filename="hamlet.xml"')
lnSuccess = loRest.AddHeader("x-ms-blob-type","BlockBlob")
lnSuccess = loRest.AddHeader("x-ms-meta-m1","v1")
lnSuccess = loRest.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.

loFileStream = CreateObject('Chilkat.Stream')
loFileStream.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".
lcResponseStr = loRest.FullRequestStream("PUT","/test/hamlet.xml",loFileStream)
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loFileStream
    CANCEL
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 (loRest.ResponseStatusCode = 201) THEN
    ? "File uploaded."
ELSE
    * 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
ENDIF

RELEASE loRest
RELEASE loAzAuth
RELEASE loFileStream