Unicode C

Fetch a Text IMAP Attachment as a String

Demonstrates the Chilkat Imap.FetchAttachmentString method, which returns one text attachment decoded to a string. The first argument is the Email, the second is the zero-based attachment index, and the third is the charset used to decode the bytes. This example returns the first attachment as a UTF-8 string.

Background: This is the convenient form when you simply want a small text attachment's content inline as a string. Only use it for attachments known to be text; decoding binary content through a charset can alter or corrupt the bytes. For binary data use FetchAttachmentBd, and for large text a StringBuilder (via FetchAttachmentSb) avoids an extra copy.

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Unicode C

#include <C_CkImapW.h>
#include <C_CkEmailW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkImapW imap;
    BOOL headersOnly;
    BOOL useUid;
    int seqNum;
    HCkEmailW email;
    int numAttach;
    const wchar_t *attachText;

    success = FALSE;

    //  Demonstrates the Imap.FetchAttachmentString method, which downloads one text attachment and
    //  returns it decoded to a string.  The 1st argument is the Email, the 2nd is the zero-based
    //  attachment index, and the 3rd is the charset used to decode the bytes.
    //  
    //  The message is fetched headers-only, then the attachment is downloaded on demand.

    imap = CkImapW_Create();

    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;
    }

    success = CkImapW_Login(imap,L"user@example.com",L"myPassword");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    success = CkImapW_SelectMailbox(imap,L"Inbox");
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    //  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    //  metadata describing the attachments is present, so the attachment info methods still work.
    headersOnly = TRUE;
    useUid = FALSE;
    seqNum = 1;
    email = CkEmailW_Create();
    success = CkImapW_FetchEmail(imap,headersOnly,seqNum,useUid,email);
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkEmailW_Dispose(email);
        return;
    }

    numAttach = CkImapW_GetMailNumAttach(imap,email);
    if (numAttach > 0) {
        //  FetchAttachmentString returns a string, so assign it to a string variable.
        attachText = CkImapW_fetchAttachmentString(imap,email,0,L"utf-8");
        if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
            wprintf(L"%s\n",CkImapW_lastErrorText(imap));
            CkImapW_Dispose(imap);
            CkEmailW_Dispose(email);
            return;
        }

        wprintf(L"%s\n",attachText);
    }

    success = CkImapW_Disconnect(imap);
    if (success == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkEmailW_Dispose(email);
        return;
    }



    CkImapW_Dispose(imap);
    CkEmailW_Dispose(email);

    }