(Unicode C) IMAP Read PEC Email of Aruba and Extract the Invoice XML Files

IMAP Read PEC Email of Aruba and Extract the Invoice XML Files.

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#include <C_CkImapW.h>
#include <C_CkMessageSetW.h>
#include <C_CkEmailW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkMimeW.h>
#include <C_CkBinDataW.h>
#include <C_CkCrypt2W.h>
#include <C_CkXmlW.h>

void ChilkatSample(void)
    {
    HCkImapW imap;
    BOOL success;
    BOOL fetchUids;
    HCkMessageSetW messageSet;
    HCkEmailW email;
    HCkEmailW attachedEmail;
    HCkStringBuilderW sbMime;
    HCkMimeW mime;
    HCkBinDataW bdP7m;
    HCkMimeW mimeP7m;
    HCkCrypt2W crypt;
    HCkXmlW xml;

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

    imap = CkImapW_Create();

    // Connect using TLS.
    CkImapW_putSsl(imap,TRUE);
    CkImapW_putPort(imap,993);
    success = CkImapW_Connect(imap,L"imap.example.com");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Authenticate
    success = CkImapW_Login(imap,L"email_account_login",L"email_account_password");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Select an IMAP mailbox
    success = CkImapW_SelectMailbox(imap,L"Inbox/postacert");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Search for messages having "POSTA CERTIFICATA: Invio File" in the subject.
    fetchUids = TRUE;
    messageSet = CkImapW_Search(imap,L"SUBJECT \"POSTA CERTIFICATA: Invio File\"",fetchUids);
    if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    if (CkMessageSetW_getCount(messageSet) < 1) {
        wprintf(L"No messages found.\n");
        CkMessageSetW_Dispose(messageSet);
        CkImapW_Dispose(imap);
        return;
    }

    // For our example, we'll process only the 1st email in the messageSet.
    // Download the MIME source of the email into a StringBuilder object.
    email = CkImapW_FetchSingle(imap,CkMessageSetW_GetId(messageSet,0),CkMessageSetW_getHasUids(messageSet));
    if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkMessageSetW_Dispose(messageSet);
        CkImapW_Dispose(imap);
        return;
    }

    CkMessageSetW_Dispose(messageSet);

    // The email should contain an attached email.
    // The Invoice XML is contained within the attached email.
    attachedEmail = CkEmailW_GetAttachedMessage(email,0);
    if (CkEmailW_getLastMethodSuccess(email) == FALSE) {
        wprintf(L"%s\n",CkEmailW_lastErrorText(email));
        CkEmailW_Dispose(email);
        CkImapW_Dispose(imap);
        return;
    }

    CkEmailW_Dispose(email);

    // Get the MIME of the attached email..
    sbMime = CkStringBuilderW_Create();
    success = CkEmailW_GetMimeSb(attachedEmail,sbMime);
    CkEmailW_Dispose(attachedEmail);

    // Load it into a Chilkat MIME object.
    mime = CkMimeW_Create();
    success = CkMimeW_LoadMimeSb(mime,sbMime);

    // Examine the structure of the MIME.
    wprintf(L"%s\n",CkMimeW_getStructure(mime,L"text"));

    // The MIME has this structure:
    // multipart/mixed
    //     application/octet-stream
    //     application/octet-stream     <-- This is where the XML is contained.   It is within an opaque signature.
    //     text/plain

    // The 2nd application/octet-stream MIME header looks like this:

    // ------=_Part_329673_-1348225228.1579889273592
    // Content-Type: application/octet-stream; name="SM99999_99aaa.xml.p7m"
    // Content-Transfer-Encoding: base64
    // Content-Disposition: attachment; filename="SM99999_99aaa.xml.p7m"

    // Let's get the binary content of the .p7m
    bdP7m = CkBinDataW_Create();
    // Get the 2nd sub-part, at index 1 because index 0 is the 1st sub-part.
    mimeP7m = CkMimeW_GetPart(mime,1);
    if (CkMimeW_getLastMethodSuccess(mime) != TRUE) {
        wprintf(L"Failed to get 2nd sub-part. Perhaps the MIME does not have a 2nd sub-part?\n");
        CkImapW_Dispose(imap);
        CkStringBuilderW_Dispose(sbMime);
        CkMimeW_Dispose(mime);
        CkBinDataW_Dispose(bdP7m);
        return;
    }

    success = CkMimeW_GetBodyBd(mimeP7m,bdP7m);
    CkMimeW_Dispose(mimeP7m);

    // Verify the signature, which also extracts the content contained within the opaque signature.
    crypt = CkCrypt2W_Create();
    success = CkCrypt2W_OpaqueVerifyBd(crypt,bdP7m);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt));
        CkImapW_Dispose(imap);
        CkStringBuilderW_Dispose(sbMime);
        CkMimeW_Dispose(mime);
        CkBinDataW_Dispose(bdP7m);
        CkCrypt2W_Dispose(crypt);
        return;
    }

    // The bdP7m now contains the Invoice XML.
    // Load it into an XML object.
    xml = CkXmlW_Create();
    success = CkXmlW_LoadBd(xml,bdP7m,TRUE);

    wprintf(L"%s\n",CkXmlW_getXml(xml));

    // We have XML such as the following:
    // 
    // <?xml version="1.0" encoding="windows-1252"?>
    // <?xml-stylesheet type="text/xsl" href="fatturapa_v1.2.xsl"?>
    // <p:FatturaElettronica versione="FPR12" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" 
    //     xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2" 
    //     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    //     <FatturaElettronicaHeader>
    // 	...
    //     </FatturaElettronicaHeader>
    //     <FatturaElettronicaBody>
    // 	...
    //     </FatturaElettronicaBody>
    // </p:FatturaElettronica>

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    wprintf(L"success.\n");


    CkImapW_Dispose(imap);
    CkStringBuilderW_Dispose(sbMime);
    CkMimeW_Dispose(mime);
    CkBinDataW_Dispose(bdP7m);
    CkCrypt2W_Dispose(crypt);
    CkXmlW_Dispose(xml);

    }