(MFC) Parse MIME Header Fields

Demonstrates how to parse MIME header fields, including Content-Type, Content-Disposition, and Content-Transfer-Encoding.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
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--------------080707010302060306060800--

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkMime.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkMime mime;

    // Load the sampleMime2.txt file into the MIME object.
    // (This file is available at http://www.chilkatsoft.com/testData/sampleMime2.txt )

    bool success = mime.LoadMimeFile("sampleMime2.txt");
    if (success == false) {
        strOut.append(mime.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The GIF image is the 2nd sub-part located directly under the
    // top-level MIME node.  Indexing begins at 0, therefore the 2nd
    // sub-part is at index 1.
    CkMime *part2 = 0;
    part2 = mime.GetPart(1);

    // -------------------------------
    // Content-Disposition
    // -------------------------------
    // In this example, the Content-Disposition header field
    // contains this value:
    // attachment; filename="starfish.gif"

    // To get the "filename", call GetHeaderFieldAttribute
    // Header field names and attribute names are case insensitive.
    const char *filename = part2->getHeaderFieldAttribute("Content-Disposition","filename");
    strOut.append("Filename: ");
    strOut.append(filename);
    strOut.append("\r\n");

    // Because the "filename" is so often accessed, it is also available
    // by accessing the "Filename" property:
    strOut.append("Filename: ");
    strOut.append(part2->filename());
    strOut.append("\r\n");

    // The disposition (without attributes) which in this case 
    // is the string "attachment" is accessed via the Disposition property:
    strOut.append("Disposition: ");
    strOut.append(part2->disposition());
    strOut.append("\r\n");

    // To get the full value of the Content-Disposition header field,
    // call GetHeaderField.
    strOut.append("Content-Disposition: ");
    strOut.append(part2->getHeaderField("Content-Disposition"));
    strOut.append("\r\n");

    // -------------------------------
    // Content-Type
    // -------------------------------
    // In this example, the Content-Type header field
    // contains this value:
    // image/gif; name="starfish.gif"

    // To get the "name", call GetHeaderFieldAttribute
    const char *name = part2->getHeaderFieldAttribute("Content-Type","name");
    strOut.append("Content-Type name: ");
    strOut.append(name);
    strOut.append("\r\n");

    // Because the "name" is so often accessed, it is also available
    // by accessing the "Name" property:
    strOut.append("Content-Type name: ");
    strOut.append(part2->name());
    strOut.append("\r\n");

    // The content-type without attributes is available in the
    // ContentType property:
    strOut.append("Content-Type: ");
    strOut.append(part2->contentType());
    strOut.append("\r\n");

    // To get the full value of the Content-Type header field,
    // call GetHeaderField.
    strOut.append("Content-Type: ");
    strOut.append(part2->getHeaderField("Content-Type"));
    strOut.append("\r\n");

    // -------------------------------
    // Content-Transfer-Encoding
    // -------------------------------

    // The Encoding property contains the value of the
    // Content-Transfer-Encoding property. 
    // Calling GetHeaderField("Content-Transfer-Encoding") is
    // equivalent to accessing the Encoding property:
    strOut.append("Content-Transfer-Encoding: ");
    strOut.append(part2->encoding());
    strOut.append("\r\n");
    strOut.append("Content-Transfer-Encoding: ");
    strOut.append(part2->getHeaderField("Content-Transfer-Encoding"));
    strOut.append("\r\n");

    delete part2;

    strOut.append("Finished.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }