(C++) Download and Save Email Attachments (POP3)

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Note: This example requires Chilkat v11.0.0 or greater.

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#include <CkMailMan.h>
#include <CkEmailBundle.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    CkMailMan mailman;

    // Set the POP3 server's hostname
    mailman.put_MailHost("pop.yourserver.com");

    // Set the POP3 login/password.
    mailman.put_PopUsername("***");
    mailman.put_PopPassword("***");

    // Copy the all email from the user's POP3 mailbox 
    // into a bundle object.  The email remains on the server.
    // FetchAll is a reasonable choice for POP3 maildrops that don't have too many
    // emails. For larger mail drops, one might download emails one at a time..
    CkEmailBundle bundle;
    bool keepOnServer = true;
    bool headersOnly = false;
    // Irrelevent because we are NOT downloading headers-only
    int numBodyLines = 0;
    success = mailman.FetchAll(keepOnServer,headersOnly,numBodyLines,bundle);
    if (success == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    // The directory path can be relative or absolute.
    // This shows a Windows style directory path.  On other operating systems, the path
    // would be different..
    const char *dirPath = "c:/myAttachments";

    CkEmail email;
    int bundleIndex = 0;
    int numMessages = bundle.get_MessageCount();

    while ((bundleIndex < numMessages)) {
        bundle.EmailAt(bundleIndex,email);

        // Save all attachments to the specified directory.
        // The directory is automatically created if it does not yet exist.
        success = email.SaveAllAttachments(dirPath);
        if (success == false) {
            std::cout << email.lastErrorText() << "\r\n";
            return;
        }

        // The OverwriteExisting property controls whether already-existing files
        // are automatically overwritten.  By default, it is set to true so that existing
        // files will be overwritten.

        // Setting OverwriteExisting = false will cause the attachment-saving methods to generate
        // unique filenames if a file with the same name already exists.  The actual filename(s)
        // saved will be present by calling GetAttachmentFilename for each attachment *after*
        // saving.
        // For example...
        email.put_OverwriteExisting(false);
        success = email.SaveAllAttachments(dirPath);
        if (success == false) {
            std::cout << email.lastErrorText() << "\r\n";
            return;
        }

        int numAttachments = email.get_NumAttachments();
        int attachIndex = 0;
        while ((attachIndex < numAttachments)) {
            // If the attachment filename was changed to prevent overwriting,
            // GetAttachmentFilename will return the new filename.
            std::cout << email.getAttachmentFilename(attachIndex) << "\r\n";
            attachIndex = attachIndex + 1;
        }

        // Attachments can also be saved individually.
        attachIndex = 0;
        while ((attachIndex < numAttachments)) {

            std::cout << "Original Filename: " << email.getAttachmentFilename(attachIndex) << "\r\n";
            success = email.SaveAttachedFile(attachIndex,dirPath);
            if (success == false) {
                std::cout << email.lastErrorText() << "\r\n";
                return;
            }

            // If OverwriteExisting = true, the saved filename will always equal the original filename,
            // unless there are characters present in the filename that are not allowed by Windows,
            // such as * ? < > | etc.  In those cases the illegal characters are either removed or replaced
            // with underscore characters to allow the file to be saved.
            std::cout << "Saved Filename: " << email.getAttachmentFilename(attachIndex) << "\r\n";
            attachIndex = attachIndex + 1;
        }

        bundleIndex = bundleIndex + 1;
    }
    }