(PowerBuilder) Upload File in Blocks (with Content-MD5 header) and Commit the Block List

Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block.

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_Crypt
oleobject loo_SbResponseBody
oleobject loo_UriPath
string ls_BlockId
oleobject loo_DataBlock
string ls_ContentMd5
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_Crypt = create oleobject
// Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

loo_Crypt.HashAlgorithm = "md5"

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_Crypt
        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)

    ls_ContentMd5 = loo_Crypt.HashBdENC(loo_DataBlock)
    loo_Rest.AddHeader("Content-MD5",ls_ContentMd5)

    // 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_Crypt
        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_Crypt
        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>

// --------------------------------------------------------------------------
// IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
// --------------------------------------------------------------------------
loo_Rest.RemoveHeader("Content-MD5")

// 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_Crypt
    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_Crypt
    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_Crypt
destroy loo_SbResponseBody
destroy loo_UriPath
destroy loo_DataBlock