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(Tcl) Insert PDF as Base64 into XML, then Extract back to PDF File

Demonstrates how to insert any file into XML using base64 encoding, and then extract back to the original file. This example embeds a PDF in the XML, but the type of file does not matter. It can be any type of file.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  Load our PDF file.
set bd [new_CkBinData]

set success [CkBinData_LoadFile $bd "qa_data/helloWorld.pdf"]
if {[expr $success != 1]} then {
    puts "Failed to load PDF file."
    delete_CkBinData $bd
    exit
}

#  Load the following XML:
# 
#  <?xml version="1.0" encoding="utf-8" ?>
#  <something>
#      <xyz>
#          <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
#      </xyz>
#  </something>

set xml [new_CkXml]

set success [CkXml_LoadXmlFile $xml "qa_data/xml/xmlToContainPdf.xml"]
if {[expr $success != 1]} then {
    puts "Failed to load XML file."
    delete_CkBinData $bd
    delete_CkXml $xml
    exit
}

#  Insert the PDF into the XML.
CkXml_NewChild2 $xml "xyz|pdfData" [CkBinData_getEncoded $bd "base64"]

#  Show the new XML:
puts [CkXml_getXml $xml]

#  The XML now looks like this:
#  <?xml version="1.0" encoding="utf-8" ?>
#  <something>
#      <xyz>
#          <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
#          <pdfData>JVBERi0xL ... UlRU9GCg==</pdfData>
#      </xyz>
#  </something>

#  To extract the PDF data out and restore the PDF file:
set bd2 [new_CkBinData]

set success [CkBinData_AppendEncoded $bd2 [CkXml_getChildContent $xml "xyz|pdfData"] "base64"]
set success [CkBinData_WriteFile $bd2 "qa_output/helloWorld.pdf"]

puts "Success."

delete_CkBinData $bd
delete_CkXml $xml
delete_CkBinData $bd2

 

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