(PowerBuilder) Upload File in Blocks and Commit the Block List

See more Azure Cloud Storage Examples

Demonstrates how to upload a file in blocks and then commit the block list. For files larger than 64MB, this is the way to upload to Azure Storage. Azure limits the size of each block to a maximum of 4MB.

For more information, see https://learn.microsoft.com/en-us/rest/api/storageservices/put-block-list?tabs=microsoft-entra-id

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

integer li_rc
oleobject loo_Rest
integer li_BTls
integer li_Port
integer li_BAutoReconnect
integer li_Success
oleobject loo_AzAuth
oleobject loo_Xml
oleobject loo_Fac
integer li_BlockSize
integer li_NumBlocks
oleobject loo_SbResponseBody
oleobject loo_UriPath
string ls_BlockId
oleobject loo_DataBlock
integer i
string ls_XmlStr
string ls_ResponseStr

// Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loo_Rest = create oleobject
// Use "Chilkat_9_5_0.Rest" for versions of Chilkat < 10.0.0
li_rc = loo_Rest.ConnectToNewObject("Chilkat.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Connect to the Azure Storage Blob Service
li_BTls = 1
li_Port = 443
li_BAutoReconnect = 1
// In this example, the storage account name is "chilkat".
li_Success = loo_Rest.Connect("chilkat.blob.core.windows.net",li_Port,li_BTls,li_BAutoReconnect)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

// Provide Azure Cloud credentials for the REST call.
loo_AzAuth = create oleobject
// Use "Chilkat_9_5_0.AuthAzureStorage" for versions of Chilkat < 10.0.0
li_rc = loo_AzAuth.ConnectToNewObject("Chilkat.AuthAzureStorage")

loo_AzAuth.AccessKey = "AZURE_ACCESS_KEY"
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
loo_AzAuth.Account = "chilkat"
loo_AzAuth.Scheme = "SharedKey"
loo_AzAuth.Service = "Blob"
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
loo_AzAuth.XMsVersion = "2021-08-06"
li_Success = loo_Rest.SetAuthAzureStorage(loo_AzAuth)

// 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.

// As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
loo_Xml = create oleobject
// Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
li_rc = loo_Xml.ConnectToNewObject("Chilkat.Xml")

loo_Xml.Tag = "BlockList"

// Any type of file can be uploaded in this way.  It can a text file, binary file, anything...
// This example will upload an XML file that is approximately 275K in size.  It can be downloaded
// at http://www.chilkatsoft.com/hamlet.xml
loo_Fac = create oleobject
// Use "Chilkat_9_5_0.FileAccess" for versions of Chilkat < 10.0.0
li_rc = loo_Fac.ConnectToNewObject("Chilkat.FileAccess")

li_Success = loo_Fac.OpenForRead("qa_data/xml/hamlet.xml")
// Assuming success for the example..

// We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
// but this is just an example...)
li_BlockSize = 16384

// How many 16K blocks?  (Including 1 for the last partial block)
li_NumBlocks = loo_Fac.GetNumBlocks(li_BlockSize)

loo_SbResponseBody = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_SbResponseBody.ConnectToNewObject("Chilkat.StringBuilder")

loo_UriPath = create oleobject
// Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
li_rc = loo_UriPath.ConnectToNewObject("Chilkat.StringBuilder")

loo_DataBlock = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_DataBlock.ConnectToNewObject("Chilkat.BinData")

i = 0
do while i < li_NumBlocks

    loo_DataBlock.Clear()
    li_Success = loo_Fac.ReadBlockBd(i,li_BlockSize,loo_DataBlock)
    if li_Success = 0 then
        Write-Debug loo_Fac.LastErrorText
        destroy loo_Rest
        destroy loo_AzAuth
        destroy loo_Xml
        destroy loo_Fac
        destroy loo_SbResponseBody
        destroy loo_UriPath
        destroy loo_DataBlock
        return
    end if

    // Generate a base64 block ID.  
    // (Chilkat provides a helper method named GenBlockId to make this easy)
    // A pre-base64 encoded block ID length of 4 is sufficient in this case because
    // this file certainly won't have more than 99,999 blocks..
    ls_BlockId = loo_Fac.GenBlockId(i,4,"base64")

    // Add this blockId to the list of blocks to be committed.
    loo_Xml.NewChild2("Latest",ls_BlockId)

    // Build the URI path
    loo_UriPath.Clear()
    li_Success = loo_UriPath.Append("/mycontainer/hamlet.xml?comp=block&blockId=")
    li_Success = loo_UriPath.Append(ls_BlockId)

    // Upload this block..
    loo_SbResponseBody.Clear()
    li_Success = loo_Rest.FullRequestBd("PUT",loo_UriPath.GetAsString(),loo_DataBlock,loo_SbResponseBody)
    if li_Success = 0 then
        Write-Debug loo_Rest.LastErrorText
        destroy loo_Rest
        destroy loo_AzAuth
        destroy loo_Xml
        destroy loo_Fac
        destroy loo_SbResponseBody
        destroy loo_UriPath
        destroy loo_DataBlock
        return
    end if

    // Verify that we received a 201 status code.
    if loo_Rest.ResponseStatusCode <> 201 then
        // Examine the request/response to see what happened.
        Write-Debug "response status code = " + string(loo_Rest.ResponseStatusCode)
        Write-Debug "response status text = " + loo_Rest.ResponseStatusText
        Write-Debug "response header: " + loo_Rest.ResponseHeader
        Write-Debug "response body (if any): " + loo_SbResponseBody.GetAsString()
        Write-Debug "---"
        Write-Debug "LastRequestStartLine: " + loo_Rest.LastRequestStartLine
        Write-Debug "LastRequestHeader: " + loo_Rest.LastRequestHeader
        destroy loo_Rest
        destroy loo_AzAuth
        destroy loo_Xml
        destroy loo_Fac
        destroy loo_SbResponseBody
        destroy loo_UriPath
        destroy loo_DataBlock
        return
    end if

    i = i + 1
loop

loo_Fac.FileClose()

// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
ls_XmlStr = loo_Xml.GetXml()
Write-Debug ls_XmlStr

// The XML will look like this:

// <?xml version="1.0" encoding="utf-8" ?>
// <BlockList>
//     <Latest>MDAwMA==</Latest>
//     <Latest>MDAwMQ==</Latest>
//     <Latest>MDAwMg==</Latest>
//     <Latest>MDAwMw==</Latest>
//     <Latest>MDAwNA==</Latest>
//     <Latest>MDAwNQ==</Latest>
//     <Latest>MDAwNg==</Latest>
//     <Latest>MDAwNw==</Latest>
//     <Latest>MDAwOA==</Latest>
//     <Latest>MDAwOQ==</Latest>
//     <Latest>MDAxMA==</Latest>
//     <Latest>MDAxMQ==</Latest>
//     <Latest>MDAxMg==</Latest>
//     <Latest>MDAxMw==</Latest>
//     <Latest>MDAxNA==</Latest>
//     <Latest>MDAxNQ==</Latest>
//     <Latest>MDAxNg==</Latest>
//     <Latest>MDAxNw==</Latest>
// </BlockList>

// Send the PUT Block List...
ls_ResponseStr = loo_Rest.FullRequestString("PUT","/mycontainer/hamlet.xml?comp=blocklist",ls_XmlStr)
if loo_Rest.LastMethodSuccess <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_AzAuth
    destroy loo_Xml
    destroy loo_Fac
    destroy loo_SbResponseBody
    destroy loo_UriPath
    destroy loo_DataBlock
    return
end if

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

if loo_Rest.ResponseStatusCode <> 201 then
    // Examine the request/response to see what happened.
    Write-Debug "response status code = " + string(loo_Rest.ResponseStatusCode)
    Write-Debug "response status text = " + loo_Rest.ResponseStatusText
    Write-Debug "response header: " + loo_Rest.ResponseHeader
    Write-Debug "response body (if any): " + ls_ResponseStr
    Write-Debug "---"
    Write-Debug "LastRequestStartLine: " + loo_Rest.LastRequestStartLine
    Write-Debug "LastRequestHeader: " + loo_Rest.LastRequestHeader
    destroy loo_Rest
    destroy loo_AzAuth
    destroy loo_Xml
    destroy loo_Fac
    destroy loo_SbResponseBody
    destroy loo_UriPath
    destroy loo_DataBlock
    return
end if

Write-Debug "Success."


destroy loo_Rest
destroy loo_AzAuth
destroy loo_Xml
destroy loo_Fac
destroy loo_SbResponseBody
destroy loo_UriPath
destroy loo_DataBlock