(Visual FoxPro) Azure Storage: List Blobs

Azure Storage Blob Service REST API: Sample code to fetch the list of blobs in the specified container.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAzAuth
LOCAL lcResponseStr
LOCAL loXml
LOCAL loLastMod
LOCAL lnNumBlobs
LOCAL i
LOCAL loDt
LOCAL lcLastModStr

lnSuccess = 0

* Azure Blob Service Example: List the blobs in a specified container.
* See also: https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx

* 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 = 0) 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)

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

* The expected success response is a 200 response status code with an XML response body.
* In this example, we are listing the blobs in the container named "mycontainer".
lcResponseStr = loRest.FullRequestNoBody("GET","/mycontainer?restype=container&comp=list")
IF (loRest.LastMethodSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAzAuth
    CANCEL
ENDIF

* When successful, the Azure Storage service will respond with a 200 response status code,
* with an XML response body.

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
    ? "response body (if any): " + lcResponseStr
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    RELEASE loRest
    RELEASE loAzAuth
    CANCEL
ENDIF

* Load the XML response for parsing.
* An example of the response XML is shown below.
loXml = CreateObject('Chilkat.Xml')
lnSuccess = loXml.LoadXml(lcResponseStr)

? loXml.GetXml()

* Let's iterate over the blobs...

loLastMod = CreateObject('Chilkat.CkDateTime')

lnNumBlobs = loXml.NumChildrenAt("Blobs")
i = 0
loDt = CreateObject('Chilkat.DtObj')
DO WHILE i < lnNumBlobs
    ? "---- Blob " + STR(i) + " ----"
    loXml.I = i
    ? "Name: " + loXml.GetChildContent("Blobs|Blob[i]|Name")
    ? "Content-Length: " + loXml.GetChildContent("Blobs|Blob[i]|Properties|Content-Length")
    ? "Content-Type: " + loXml.GetChildContent("Blobs|Blob[i]|Properties|Content-Type")
    ? "Content-MD5: " + loXml.GetChildContent("Blobs|Blob[i]|Properties|Content-MD5")
    ? "BlobType: " + loXml.GetChildContent("Blobs|Blob[i]|Properties|BlobType")
    ? "LeaseStatus: " + loXml.GetChildContent("Blobs|Blob[i]|Properties|LeaseStatus")
    loLastMod.SetFromRfc822(loXml.GetChildContent("Blobs|Blob[i]|Properties|Last-Modified"))
    loLastMod.ToDtObj(1,loDt)

    ? "Last-Modified YMD: " + STR(loDt.Year) + "," + STR(loDt.Month) + "," + STR(loDt.Day)
    i = i + 1
ENDDO

? "-------------------------"

* Use the ChilkatPath method to get information for a specific blob:

* For example, let's say we want the Last-Modified date/time for
* the blob named "helloWorld.txt"
lcLastModStr = loXml.ChilkatPath("/C/Name,helloWorld.txt|..|Properties|Last-Modified|*")
? "helloWorld.txt Last-Modified: " + lcLastModStr

? "Success."

* <?xml version="1.0" encoding="utf-8" ?>
* <EnumerationResults ServiceEndpoint="https://chilkat.blob.core.windows.net/" ContainerName="test">
*     <Blobs>
*         <Blob>
*             <Name>hamletC.xml</Name>
*             <Properties>
*                 <Last-Modified>Mon, 02 May 2016 23:50:30 GMT</Last-Modified>
*                 <Etag>0x8D372E48B6D323A</Etag>
*                 <Content-Length>279658</Content-Length>
*                 <Content-Type>application/octet-stream</Content-Type>
*                 <Content-Encoding />
*                 <Content-Language />
*                 <Content-MD5>4E6prI9haw81xadSLeEj3Q==</Content-MD5>
*                 <Cache-Control />
*                 <Content-Disposition>attachment; filename="hamletC.xml"</Content-Disposition>
*                 <BlobType>BlockBlob</BlobType>
*                 <LeaseStatus>unlocked</LeaseStatus>
*                 <LeaseState>available</LeaseState>
*             </Properties>
*         </Blob>
*         <Blob>
*             <Name>helloWorld.txt</Name>
*             <Properties>
*                 <Last-Modified>Mon, 02 May 2016 15:21:55 GMT</Last-Modified>
*                 <Etag>0x8D3729D7EE38299</Etag>
*                 <Content-Length>12</Content-Length>
*                 <Content-Type>application/octet-stream</Content-Type>
*                 <Content-Encoding />
*                 <Content-Language />
*                 <Content-MD5>7Qdih1MuhjZehB6Sv8UNjA==</Content-MD5>
*                 <Cache-Control />
*                 <Content-Disposition>attachment; filename="helloWorld.txt"</Content-Disposition>
*                 <BlobType>BlockBlob</BlobType>
*                 <LeaseStatus>unlocked</LeaseStatus>
*                 <LeaseState>available</LeaseState>
*             </Properties>
*         </Blob>
*         <Blob>
*             <Name>thisIsATest.txt</Name>
*             <Properties>
*                 <Last-Modified>Tue, 03 May 2016 00:22:13 GMT</Last-Modified>
*                 <Etag>0x8D372E8F9B2A62E</Etag>
*                 <Content-Length>1600</Content-Length>
*                 <Content-Type>application/octet-stream</Content-Type>
*                 <Content-Encoding />
*                 <Content-Language />
*                 <Content-MD5>FhgUXYfePg2ItsraPmz0Xg==</Content-MD5>
*                 <Cache-Control />
*                 <Content-Disposition>attachment; filename="thisIsATest.txt"</Content-Disposition>
*                 <BlobType>BlockBlob</BlobType>
*                 <LeaseStatus>unlocked</LeaseStatus>
*                 <LeaseState>available</LeaseState>
*             </Properties>
*         </Blob>
*     </Blobs>
*     <NextMarker />
* </EnumerationResults>
* 

RELEASE loRest
RELEASE loAzAuth
RELEASE loXml
RELEASE loLastMod
RELEASE loDt