Visual FoxPro

S3 Get Bucket Objects with CommonPrefixes

See more Amazon S3 Examples

Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes. Visual FoxPro

LOCAL lnSuccess
LOCAL loHttp
LOCAL lcStrXml
LOCAL loXml
LOCAL lcPrefix
LOCAL i
LOCAL lnCount_i

lnSuccess = 0

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

loHttp = CreateObject('Chilkat.Http')

* Insert your access key here:
loHttp.AwsAccessKey = "AWS_ACCESS_KEY"

* Insert your secret key here:
loHttp.AwsSecretKey = "AWS_SECRET_KEY"

* In this example, my bucket is "chilkat100".
* It contains a number of folders, one of which is named "images".
* I want to get a list of all sub-folders under the "images" folder
lcStrXml = loHttp.S3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/")
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    CANCEL
ENDIF

? "Response status code = " + STR(loHttp.LastStatus)

loXml = CreateObject('Chilkat.Xml')
lnSuccess = loXml.LoadXml(lcStrXml)
IF (lnSuccess <> 1) THEN
    ? loXml.LastErrorText
    RELEASE loHttp
    RELEASE loXml
    CANCEL
ENDIF

* If the response status code was not 200, then the XML response is not a 
* listing of objects, but instead contains error information.
IF (loHttp.LastStatus <> 200) THEN
    ? loXml.GetXml()
    ? "Failed."
    RELEASE loHttp
    RELEASE loXml
    CANCEL
ENDIF

* A sample response is shown below.
? loXml.GetXml()
? "----"

* Here is the list of sub-folders (i.e. CommonPrefixes)

* <?xml version="1.0" encoding="UTF-8"?>
* <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
*     <Name>chilkat100</Name>
*     <Prefix>images/</Prefix>
*     <Marker/>
*     <MaxKeys>1000</MaxKeys>
*     <Delimiter>/</Delimiter>
*     <IsTruncated>false</IsTruncated>
*     <CommonPrefixes>
*         <Prefix>images/africa/</Prefix>
*     </CommonPrefixes>
*     <CommonPrefixes>
*         <Prefix>images/sea_creatures/</Prefix>
*     </CommonPrefixes>
* </ListBucketResult>

* The XML can be parsed like this:
i = 0
lnCount_i = loXml.NumChildrenHavingTag("CommonPrefixes")
DO WHILE i < lnCount_i
    loXml.I = i
    lcPrefix = loXml.GetChildContent("CommonPrefixes[i]|Prefix")
    ? "Prefix = " + lcPrefix
    i = i + 1
ENDDO

RELEASE loHttp
RELEASE loXml