Unicode C++

Get IMAP Attachment Sizes

Demonstrates the Chilkat Imap.GetMailAttachSize method, which returns the size in bytes of an attachment. The first argument is the Email and the second is the zero-based attachment index. This example fetches headers only and prints each attachment's name and size.

Background: Like the attachment filename, the size comes from ckx-imap-* metadata and is available from a header-only fetch without downloading the body. A client can therefore show attachment sizes in a message preview, and decide whether to auto-download or prompt before pulling a large file.

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#include <CkImapW.h>
#include <CkEmailW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Imap.GetMailAttachSize method, which returns the size in bytes of an
    //  attachment.  The 1st argument is the Email and the 2nd is the zero-based attachment index.

    CkImapW imap;

    imap.put_Ssl(true);
    imap.put_Port(993);

    success = imap.Connect(L"imap.example.com");
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    success = imap.Login(L"user@example.com",L"myPassword");
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    success = imap.SelectMailbox(L"Inbox");
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        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.
    bool headersOnly = true;
    bool useUid = false;
    int seqNum = 1;
    CkEmailW email;
    success = imap.FetchEmail(headersOnly,seqNum,useUid,email);
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    int numAttach = imap.GetMailNumAttach(email);
    int i;
    for (i = 0; i <= numAttach - 1; i++) {
        const wchar_t *fname = imap.getMailAttachFilename(email,i);
        if (imap.get_LastMethodSuccess() == false) {
            wprintf(L"%s\n",imap.lastErrorText());
            return;
        }

        int sz = imap.GetMailAttachSize(email,i);
        wprintf(L"%s: %d bytes\n",fname,sz);
    }

    success = imap.Disconnect();
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }
    }