Visual Basic 6.0 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. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim http As New ChilkatHttp
Dim req As New ChilkatHttpRequest

'  ...
'  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 New ChilkatHttpResponse
success = http.HttpSReq("www.somedomain.com",443,1,req,resp)
If (success = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

'  Get the response body (which is expected to be binary)
Dim respBody As New ChilkatBinData
success = 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 New ChilkatMime
success = mime.LoadMimeBd(respBody)
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Dim numParts As Long
numParts = mime.NumParts
If (numParts < 2) Then
    Debug.Print "Expected multipart MIME with at least 2 sub-parts."
    Exit Sub
End If

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

Dim part0 As New ChilkatMime
success = mime.PartAt(0,part0)

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

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

Dim part1 As New ChilkatMime
success = 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 New ChilkatBinData
success = part1.GetBodyBd(zipData)
success = zipData.WriteFile("qa_output/attachedZip_again.zip")

Debug.Print "OK."