Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

VB.NET Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(VB.NET) S3 Upload the Parts for a Multipart Upload

This example uploads a large file in parts. The multipart upload needs to have been first initiated prior to uploading the parts.

See http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPart.html for more information about uploading parts.

Chilkat .NET Downloads

Chilkat .NET Assemblies

Chilkat for .NET Core

Chilkat for Mono

' In the 1st step for uploading a large file, the multipart upload was initiated
' as shown here: Initiate Multipart Upload

' Other S3 Multipart Upload Examples:
' Complete Multipart Upload
' Abort Multipart Upload
' List Parts

' When we initiated the multipart upload, we saved the XML response to a file.  This
' XML response contains the UploadId.  We'll begin by loading that XML and getting
' the Upload ID.

Dim xmlInit As New Chilkat.Xml
Dim success As Boolean = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml")
If (success <> True) Then
    Debug.WriteLine("Did not find the initiate.xml XML file.")
    Exit Sub
End If


Dim uploadId As String = xmlInit.GetChildContent("UploadId")
Debug.WriteLine("UploadId = " & uploadId)


' When uploading parts, we need to keep an XML record of each part number
' and its corresponding ETag, which is received in the response for each part.
' There can be up to 10000 parts, numbered 1 to 10000.  
' After all parts have been uploaded, the final step will be to complete
' the multipart upload (see Complete Multipart Upload)

' In this example, the large file we want to upload is somethingBig.zip
Dim fileToUploadPath As String = "s3_multipart_uploads/somethingBig.zip"

' The minimum allowed part size is 5MB (5242880 bytes).  The last part can be smaller because
' it will contain the remainder of the file.  (This minimum is enforced by the AWS service.)
' We'll use the minimum allowed part size for this example.
Dim partSize As Integer = 5242880

' Let's use Chilkat's FileAccess API to examine the file to be uploaded.  We'll get the size
' of the file and find out how many parts will be needed, including the final "partial" part.
Dim fac As New Chilkat.FileAccess
fac.OpenForRead(fileToUploadPath)

' How many parts will there be if each part is 5242880 bytes?
Dim numParts As Integer = fac.GetNumBlocks(partSize)
Debug.WriteLine("numParts = " & numParts)
fac.FileClose()

' Imagine that we may be running this for the 1st time, or maybe we already
' attempted to upload parts, and something failed. Maybe there was a network problem
' the resulted in not all parts getting uploaded.  We'll write this code so that if run again,
' it will upload whatever parts haven't yet been uploaded.

' We'll keep a partsList.xml file to record the parts that have already been successfully
' uploaded.  If this file does not yet exist, we'll create it..
Dim partsListFile As String = "s3_multipart_uploads/partsList.xml"
Dim partsListXml As New Chilkat.Xml
If (fac.FileExists(partsListFile) = True) Then
    partsListXml.LoadXmlFile(partsListFile)
End If

' Make sure the top-level tag is "CompleteMultipartUpload"
partsListXml.Tag = "CompleteMultipartUpload"

' --------------------------------------
' Before entering the loop to upload parts,
' setup the REST object with AWS authentication,
' and make the initial connection.
Dim rest As New Chilkat.Rest

' Connect to the Amazon AWS REST server.
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
success = rest.Connect("s3.amazonaws.com",port,bTls,bAutoReconnect)

' ----------------------------------------------------------------------------
' Important: For buckets created in regions outside us-east-1,
' there are three important changes that need to be made.
' See Working with S3 Buckets in Non-us-east-1 Regions for the details.
' ----------------------------------------------------------------------------

' Provide AWS credentials for the REST call.
Dim authAws As New Chilkat.AuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"
success = rest.SetAuthAws(authAws)

' Set the bucket name via the HOST header.
' In this case, the bucket name is "chilkat100".
rest.Host = "chilkat100.s3.amazonaws.com"
' --------------------------------------


Dim partNumber As Integer = 1
Dim sbPartNumber As New Chilkat.StringBuilder

While (partNumber <= numParts)
    Debug.WriteLine("---- " & partNumber & " ----")

    ' This cumbersome way of converting an integer to a string is because
    ' Chilkat examples are written in a script that is converted to many programming languages.
    ' At this time, the translator does not have integer-to-string code generation capability..
    sbPartNumber.Clear()
    sbPartNumber.AppendInt(partNumber)

    Dim bPartAlreadyUploaded As Boolean = False

    ' If there are no children, then the XML is empty and no parts have yet been uploaded.
    Dim numUploadedParts As Integer = partsListXml.NumChildren
    If (numUploadedParts > 0) Then
        ' If some parts have been uploaded, check to see if this particular part was already upload.
        ' If so, then it can be skipped.

        ' Position ourselves at the 1st record.
        Dim xRec0 As Chilkat.Xml = partsListXml.GetChild(0)
        Dim foundRec As Chilkat.Xml = xRec0.FindNextRecord("PartNumber",sbPartNumber.GetAsString())
        If (xRec0.LastMethodSuccess = True) Then
            bPartAlreadyUploaded = True
            Debug.WriteLine("Part " & partNumber & " was previously uploaded.")
            Debug.WriteLine(foundRec.GetXml())

        End If



    End If


    ' If this part was not already uploaded, we need to upload.
    ' Also update the partsListXml and save as each part is successfully uploaded.
    If (bPartAlreadyUploaded = False) Then
        Debug.WriteLine("Uploading part " & partNumber & " ...")

        ' Setup the stream source for the large file to be uploaded..
        Dim fileStream As New Chilkat.Stream
        fileStream.SourceFile = fileToUploadPath
        ' The Chilkat Stream API has features to make uploading a parts
        ' of a file easy.  Indicate the part size by setting the SourceFilePartSize
        ' property.
        fileStream.SourceFilePartSize = partSize

        ' Our HTTP start line to upload a part will look like this:
        ' PUT /ObjectName?partNumber=PartNumber&uploadId=UploadId HTTP/1.1

        ' Set the query params.  We'll need partNumber and uploadId.
        ' Make sure the query params from previous iterations are clear.
        rest.ClearAllQueryParams()
        rest.AddQueryParam("partNumber",sbPartNumber.GetAsString())
        rest.AddQueryParam("uploadId",uploadId)

        ' Upload this particular file part.
        ' Tell the fileStream which part is being uploaded.
        ' Our partNumber is 1-based (the 1st part is at index 1), but the fileStream's SourceFilePart
        ' property is 0-based.  Therefore we use partNumber-1.
        fileStream.SourceFilePart = partNumber - 1

        ' Because the SourceFilePart and SourceFilePartSize properties are set, the stream will 
        ' will provide just that part of the file.  
        Dim responseStr As String = rest.FullRequestStream("PUT","/somethingBig.zip",fileStream)
        If (rest.LastMethodSuccess <> True) Then
            Debug.WriteLine(rest.LastErrorText)
            Exit Sub
        End If


        If (rest.ResponseStatusCode <> 200) Then
            ' Examine the request/response to see what happened.
            Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
            Debug.WriteLine("response status text = " & rest.ResponseStatusText)
            Debug.WriteLine("response header: " & rest.ResponseHeader)
            Debug.WriteLine("response body: " & responseStr)
            Debug.WriteLine("---")
            Debug.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
            Debug.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
            Exit Sub
        End If


        ' OK, this part was uploaded..
        ' The response will have a 0-length body.  The only information we need is the 
        ' ETag response header field.
        Dim etag As String = rest.ResponseHdrByName("ETag")
        ' It should be present, but just in case there was no ETag header...
        If (rest.LastMethodSuccess <> True) Then
            Debug.WriteLine("No ETag response header found!")
            Debug.WriteLine("response header: " & rest.ResponseHeader)
            Exit Sub
        End If


        ' We need to add record to the partsListXml.
        ' The record will look like this:
        ' &lt;Part>
        '   &lt;PartNumber>PartNumber&lt;/PartNumber>
        '   &lt;ETag>ETag&lt;/ETag>
        ' &lt;/Part>
        Dim xPart As Chilkat.Xml = partsListXml.NewChild("Part","")
        xPart.NewChildInt2("PartNumber",partNumber)
        xPart.NewChild2("ETag",etag)


        success = partsListXml.SaveXml(partsListFile)
        If (success <> True) Then
            Debug.WriteLine(partsListXml.LastErrorText)
            Exit Sub
        End If


        Debug.WriteLine("-- Part " & partNumber & " uploaded. ---------------------")
    End If


    partNumber = partNumber + 1
End While

Debug.WriteLine("Finished.  All parts uploaded.")

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.