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Tcl Examples

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(Tcl) 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 Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set http [new_CkHttp]

set req [new_CkHttpRequest]

# ...
# 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.
# resp is a CkHttpResponse
set resp [CkHttp_SynchronousRequest $http "www.somedomain.com" 443 1 $req]
if {[expr [CkHttp_get_LastMethodSuccess $http] != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    exit
}

# Get the response body (which is expected to be binary)
set respBody [new_CkBinData]

CkHttpResponse_GetBodyBd $resp $respBody
delete_CkHttpResponse $resp

# 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.
set mime [new_CkMime]

set success [CkMime_LoadMimeBd $mime $respBody]
if {[expr $success != 1]} then {
    puts [CkMime_lastErrorText $mime]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    delete_CkBinData $respBody
    delete_CkMime $mime
    exit
}

set numParts [CkMime_get_NumParts $mime]
if {[expr $numParts < 2]} then {
    puts "Expected multipart MIME with at least 2 sub-parts."
    delete_CkHttp $http
    delete_CkHttpRequest $req
    delete_CkBinData $respBody
    delete_CkMime $mime
    exit
}

# Get the 1st sub-part, which is the XML.
# part0 is a CkMime
set part0 [CkMime_GetPart $mime 0]
# Should be OK because we checked NumParts above..
set xmlStr [CkMime_getBodyDecoded $part0]
puts "$xmlStr"
puts "----"
delete_CkMime $part0

# Save the 2nd part to a file.  (It is a .zip file in our test case..)
# part1 is a CkMime
set part1 [CkMime_GetPart $mime 1]
set success [CkMime_SaveBody $part1 "qa_output/attachedZip.zip"]

# Alternatively, we could extract the binary data to a BinData and use elsewhere..
set zipData [new_CkBinData]

set success [CkMime_GetBodyBd $part1 $zipData]
set success [CkBinData_WriteFile $zipData "qa_output/attachedZip_again.zip"]
delete_CkMime $part1

puts "OK."

delete_CkHttp $http
delete_CkHttpRequest $req
delete_CkBinData $respBody
delete_CkMime $mime
delete_CkBinData $zipData

 

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