C++

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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C++

#include <CkMime.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMime mime;
    success = mime.LoadMimeFile("qa_data/multipart_message.eml");
    if (success == false) {
        std::cout << mime.lastErrorText() << "\r\n";
        return;
    }

    //  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
    //  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
    //  the parent tree.
    int n = mime.get_NumParts();
    std::cout << "Number of parts: " << n << "\r\n";

    CkMime part;
    int i;
    for (i = 0; i <= n - 1; i++) {
        success = mime.PartAt(i,part);
        if (success == false) {
            std::cout << mime.lastErrorText() << "\r\n";
            return;
        }

        std::cout << "Part " << i << " Content-Type: " << part.contentType() << "\r\n";
    }
    }