Fetch a Single Message's MIME into a StringBuilder

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Demonstrates the Chilkat Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a StringBuilder. The first argument is the message id, the second (bUid) selects UID vs sequence number, and the third is the StringBuilder, which is cleared first. This example downloads a message by UID and prints the MIME length.

Background: Chilkat interprets the received MIME as UTF-8. Messages using Base64 or quoted-printable transfer encoding are safe because their encoded bytes are ASCII. Raw 8bit or binary content, or unencoded text in a charset such as ISO-8859-1 or Shift_JIS, can be misinterpreted — in those cases use FetchSingleBd to get the exact bytes.

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#include <C_CkImap.h>
#include <C_CkMessageSet.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkImap imap;
    BOOL wantUids;
    HCkMessageSet msgSet;
    unsigned long uid;
    BOOL useUid;
    HCkStringBuilder sbMime;

    success = FALSE;

    //  Demonstrates the Imap.FetchSingleAsMimeSb method, which downloads one message's MIME into a
    //  StringBuilder.  The 1st argument is the message id, the 2nd (bUid) selects UID vs sequence
    //  number, and the 3rd is the StringBuilder (cleared first).

    imap = CkImap_Create();

    CkImap_putSsl(imap,TRUE);
    CkImap_putPort(imap,993);

    success = CkImap_Connect(imap,"imap.example.com");
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        return;
    }

    success = CkImap_Login(imap,"user@example.com","myPassword");
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        return;
    }

    success = CkImap_SelectMailbox(imap,"Inbox");
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        return;
    }

    //  Search for the message ids to download, returning UIDs.
    wantUids = TRUE;
    msgSet = CkMessageSet_Create();
    success = CkImap_QueryMbx(imap,"ALL",wantUids,msgSet);
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        CkMessageSet_Dispose(msgSet);
        return;
    }

    if (CkMessageSet_getCount(msgSet) > 0) {
        uid = CkMessageSet_GetId(msgSet,0);

        //  Download the message's MIME into a StringBuilder.  The id is a UID.
        useUid = TRUE;
        sbMime = CkStringBuilder_Create();
        success = CkImap_FetchSingleAsMimeSb(imap,uid,useUid,sbMime);
        if (success == FALSE) {
            printf("%s\n",CkImap_lastErrorText(imap));
            CkImap_Dispose(imap);
            CkMessageSet_Dispose(msgSet);
            CkStringBuilder_Dispose(sbMime);
            return;
        }

        printf("MIME length: %d chars\n",CkStringBuilder_getLength(sbMime));
    }

    success = CkImap_Disconnect(imap);
    if (success == FALSE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        CkImap_Dispose(imap);
        CkMessageSet_Dispose(msgSet);
        CkStringBuilder_Dispose(sbMime);
        return;
    }



    CkImap_Dispose(imap);
    CkMessageSet_Dispose(msgSet);
    CkStringBuilder_Dispose(sbMime);

    }