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Visual FoxPro Examples

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(Visual FoxPro) S3 Upload String using AWS Signature Version 2

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL lnSuccess
LOCAL loAuthAws
LOCAL loFac
LOCAL lcFileContents
LOCAL lcResponseBodyStr
LOCAL lnStatusCode

*  Demonstrates how to use older AWS S3 Signature Version 2 for uploading the contents
*  of a string variable to an object in a bucket.

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

loRest = CreateObject('Chilkat_9_5_0.Rest')

*  Connect to the Amazon AWS REST server.
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
*  The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
lnSuccess = loRest.Connect("chilkat100.s3.amazonaws.com",lnPort,lnBTls,lnBAutoReconnect)

*  ----------------------------------------------------------------------------
*  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.
loAuthAws = CreateObject('Chilkat_9_5_0.AuthAws')
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.SecretKey = "AWS_SECRET_KEY"
loAuthAws.ServiceName = "s3"

*  For AWS Signature Version 2, the following two properties need to be set:
loAuthAws.SignatureVersion = 2
*  See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
*  The bucket is "chilkat100", and the uriPath is "/hamlet_play.xml", which must match
*  the URI path passed to the FullRequestString method below.
loAuthAws.CanonicalizedResourceV2 = "/chilkat100/hamlet_play.xml"

lnSuccess = loRest.SetAuthAws(loAuthAws)

*  Load a text file into memory.
loFac = CreateObject('Chilkat_9_5_0.FileAccess')
lcFileContents = loFac.ReadEntireTextFile("qa_data/xml/hamlet.xml","utf-8")
IF (loFac.LastMethodSuccess <> 1) THEN
    ? loFac.LastErrorText
    RELEASE loRest
    RELEASE loAuthAws
    RELEASE loFac
    CANCEL
ENDIF

*  To send the file in gzip or deflate compressed format, set the Content-Encoding request
*  header to "gzip" or "deflate".  (this is optional)
lnSuccess = loRest.AddHeader("Content-Encoding","gzip")

*  Indicate the Content-Type of our upload.  (This is optional)
lnSuccess = loRest.AddHeader("Content-Type","text/xml")

*  We can add an "Expect: 100-continue" header so that if the request is rejected
*  by the server immediately after receiving the request header, it can respond
*  and the client (Chilkat) can avoid sending the file data.
*  (this is optional)
lnSuccess = loRest.AddHeader("Expect","100-continue")

*  Upload the file to Amazon S3.
lcResponseBodyStr = loRest.FullRequestString("PUT","/hamlet_play.xml",lcFileContents)
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAuthAws
    RELEASE loFac
    CANCEL
ENDIF

*  Did we get a 200 response indicating success?
lnStatusCode = loRest.ResponseStatusCode
IF (lnStatusCode <> 200) THEN
    ? "Error response: " + lcResponseBodyStr
    ? "Status code: " + STR(lnStatusCode) + ", Status text: " + loRest.ResponseStatusText
    RELEASE loRest
    RELEASE loAuthAws
    RELEASE loFac
    CANCEL
ENDIF

? "File successfully uploaded."

RELEASE loRest
RELEASE loAuthAws
RELEASE loFac


 

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