(Unicode C++) Extract XML File from a .p7m (e.g. FATTURA ELETTRONICA, ITALY)

Unicode C++ example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file.

One use for this example is to extract the XML file from a Fattura Elettronica .p7m signature.

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#include <CkCrypt2W.h>

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

    CkCrypt2W crypt;

    const wchar_t *outputFile = L"testData/xml/original.xml";
    const wchar_t *inFile = L"testData/p7m/fattura_signature.p7m";

    // Verify the signature and extract the XML file.
    bool success = crypt.VerifyP7M(inFile,outputFile);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    wprintf(L"Success!\n");
    }