B4X Requires Chilkat v11.0.0+

Parse Multipart Binary Http Response

See more HTTP Examples

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf. B4X

Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")
Dim req As ChilkatHttpRequest
req.Initialize

'  ...
'  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.
Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpSReq("www.somedomain.com", 443, True, req, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


'  Get the response body (which is expected to be binary)
Dim respBody As ChilkatBinData
respBody.Initialize
resp.GetBodyBd(respBody)

'  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.
Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeBd(respBody)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim numParts As Int = mime.NumParts
If numParts < 2 Then
    Log("Expected multipart MIME with at least 2 sub-parts.")
    Return
End If


'  Get the 1st sub-part, which is the XML.

Dim part0 As ChilkatMime
part0.Initialize
mime.PartAt(0, part0)

'  Should be OK because we checked NumParts above..
Dim xmlStr As String = part0.GetBodyDecoded
Log(xmlStr)
Log("----")

'  Save the 2nd part to a file.  (It is a .zip file in our test case..)

Dim part1 As ChilkatMime
part1.Initialize
mime.PartAt(1, part1)

success = part1.SaveBody("qa_output/attachedZip.zip")

'  Alternatively, we could extract the binary data to a BinData and use elsewhere..
Dim zipData As ChilkatBinData
zipData.Initialize
success = part1.GetBodyBd(zipData)
success = zipData.WriteFile("qa_output/attachedZip_again.zip")

Log("OK.")