(MFC) XML Inclusive Canonicalization

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkStringBuilder.h>
#include <CkXmlDSig.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // The XML digital signature verification class provides utility methods for
    // XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

    CkHttp http;
    CkStringBuilder sbXml;
    CkXmlDSig canon;

    // Use inclusive XML canonicalization.
    const char *canonVersion = "C14N";
    bool withComments = false;

    const char *url = "https://www.chilkatsoft.com/exampleData/c14n/test7.xml";
    bool success = http.QuickGetSb(url,sbXml);

    // This is the input XML:
    // The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
    // are kept, as we'll see below..

    // <doc>
    // <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
    //   			<snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    const char *xmlInclCanon = canon.canonicalizeXml(sbXml.getAsString(),canonVersion,withComments);
    strOut.append(xmlInclCanon);
    strOut.append("\r\n");

    // The C14N (inclusive) canonicalization is:

    // <doc>
    // 
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    // To see the difference, let's do exclusive canonicalization..
    canonVersion = "EXCL_C14N";

    const char *xmlExclCanon = canon.canonicalizeXml(sbXml.getAsString(),canonVersion,withComments);
    strOut.append(xmlExclCanon);
    strOut.append("\r\n");

    // // The C14N (exclusive) canonicalization is:
    // 
    // <doc>
    // 
    // 	<animal>
    // 		<reptile>
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }