(Unicode C++) Examine KeyInfo Certificate in XML Signature

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo.

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#include <CkXmlDSigW.h>
#include <CkStringBuilderW.h>
#include <CkXmlW.h>
#include <CkCertW.h>

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

    CkXmlDSigW dsig;
    CkStringBuilderW sbXml;

    bool success = sbXml.LoadFile(L"c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml",L"utf-8");
    if (success != true) {
        wprintf(L"Failed to load XML file.\n");
        return;
    }

    success = dsig.LoadSignatureSb(sbXml);
    if (success != true) {
        wprintf(L"%s\n",dsig.lastErrorText());
        return;
    }

    // Get the KeyInfo XML.
    CkXmlW *xmlKeyInfo = dsig.GetKeyInfo();
    if (dsig.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",dsig.lastErrorText());
        return;
    }

    wprintf(L"%s\n",xmlKeyInfo->getXml());
    wprintf(L"----\n");

    // Assuming the X509Certificate is in the KeyInfo, it will look like this:

    //   <ds:KeyInfo Id="...">
    //     <ds:KeyValue>
    //     ...  
    //     <ds:X509Data>
    //       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
    //     </ds:X509Data>
    //   </ds:KeyInfo>
    const wchar_t *certBase64 = xmlKeyInfo->getChildContent(L"*:X509Data|*:X509Certificate");
    if (xmlKeyInfo->get_LastMethodSuccess() != true) {
        wprintf(L"No X509Certificate found in the KeyInfo.\n");
        return;
    }

    // Load a certificate object w/ the base64.
    CkCertW cert;
    success = cert.LoadFromBase64(certBase64);
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Examine the cert..
    wprintf(L"SubjectDN: %s\n",cert.subjectDN());
    wprintf(L"IssuerDN: %s\n",cert.issuerDN());
    wprintf(L"SerialNumber as Decimal: %s\n",cert.serialDecimal());

    delete xmlKeyInfo;
    }