(Visual FoxPro) Parse Multipart Binary Http Response

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loHttp
LOCAL loReq
LOCAL loResp
LOCAL loRespBody
LOCAL loMime
LOCAL lnNumParts
LOCAL loPart0
LOCAL lcXmlStr
LOCAL loPart1
LOCAL loZipData

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')

* ...
* Insert code here to construct some kind of HTTP request.
* this example is to show how to parse a particular kind of response.
* ...
* ...

* Send the request (whatever it may be in your case) to get the HTTP response object.
loResp = loHttp.SynchronousRequest("www.somedomain.com",443,1,loReq)
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loReq
    CANCEL
ENDIF

* Get the response body (which is expected to be binary)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loRespBody = CreateObject('Chilkat.BinData')
loResp.GetBodyBd(loRespBody)
RELEASE loResp

* For this example, the response body contains something like this:

* ------=_Part_21302_2029949381.1547401515443
* Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
* Content-Transfer-Encoding: 8bit
* Content-ID: <rootpart@ws.jboss.org>
* 
* <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'><env:Header></env:Header><env:Body>...</env:Body></env:Envelope>
* ------=_Part_21302_2029949381.1547401515443
* Content-Type: application/octet-stream
* Content-Transfer-Encoding: binary
* Content-Id: <fileArchivio-7d302908-4d64-43d3-bf4e-79ce806d43b3@ws.jboss.org>
* 
* BINARY_CONTENT_HERE...
* 
* ------=_Part_21302_2029949381.1547401515443--
* 

* Load it into a Chilkat MIME object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Mime')
loMime = CreateObject('Chilkat.Mime')
lnSuccess = loMime.LoadMimeBd(loRespBody)
IF (lnSuccess <> 1) THEN
    ? loMime.LastErrorText
    RELEASE loHttp
    RELEASE loReq
    RELEASE loRespBody
    RELEASE loMime
    CANCEL
ENDIF

lnNumParts = loMime.NumParts
IF (lnNumParts < 2) THEN
    ? "Expected multipart MIME with at least 2 sub-parts."
    RELEASE loHttp
    RELEASE loReq
    RELEASE loRespBody
    RELEASE loMime
    CANCEL
ENDIF

* Get the 1st sub-part, which is the XML.
loPart0 = loMime.GetPart(0)
* Should be OK because we checked NumParts above..
lcXmlStr = loPart0.GetBodyDecoded()
? lcXmlStr
? "----"
RELEASE loPart0

* Save the 2nd part to a file.  (It is a .zip file in our test case..)
loPart1 = loMime.GetPart(1)
lnSuccess = loPart1.SaveBody("qa_output/attachedZip.zip")

* Alternatively, we could extract the binary data to a BinData and use elsewhere..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loZipData = CreateObject('Chilkat.BinData')
lnSuccess = loPart1.GetBodyBd(loZipData)
lnSuccess = loZipData.WriteFile("qa_output/attachedZip_again.zip")
RELEASE loPart1

? "OK."

RELEASE loHttp
RELEASE loReq
RELEASE loRespBody
RELEASE loMime
RELEASE loZipData