PowerBuilder
PowerBuilder
Upload File in Blocks (with Content-MD5 header) 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. This example includes a Content-MD5 header for each block.Chilkat PowerBuilder Downloads
integer li_rc
integer li_Success
oleobject loo_Rest
integer li_BTls
integer li_Port
integer li_BAutoReconnect
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
li_Success = 0
// 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
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
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
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
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
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")
loo_Crypt.HashAlgorithm = "md5"
loo_SbResponseBody = create oleobject
li_rc = loo_SbResponseBody.ConnectToNewObject("Chilkat.StringBuilder")
loo_UriPath = create oleobject
li_rc = loo_UriPath.ConnectToNewObject("Chilkat.StringBuilder")
loo_DataBlock = create oleobject
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