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
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

#include <CkMime.h>

void ChilkatSample(void)
    {
    CkMime mime;

    bool success;
    success = mime.UnlockComponent("Anything for 30-day trial.");
    if (success == false) {
        printf("%s\n",mime.lastErrorText());
        return;
    }

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

    success = mime.LoadMimeFile("sampleMime2.txt");
    if (success == false) {
        printf("%s\n",mime.lastErrorText());
        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;
    filename = part2->getHeaderFieldAttribute("Content-Disposition","filename");
    printf("Filename: %s\n",filename);

    //  Because the "filename" is so often accessed, it is also available
    //  by accessing the "Filename" property:
    printf("Filename: %s\n",part2->filename());

    //  The disposition (without attributes) which in this case
    //  is the string "attachment" is accessed via the Disposition property:
    printf("Disposition: %s\n",part2->disposition());

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

    //  -------------------------------
    //  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;
    name = part2->getHeaderFieldAttribute("Content-Type","name");
    printf("Content-Type name: %s\n",name);

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

    //  The content-type without attributes is available in the
    //  ContentType property:
    printf("Content-Type: %s\n",part2->contentType());

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

    //  -------------------------------
    //  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:
    printf("Content-Transfer-Encoding: %s\n"
        ,part2->encoding());
    printf("Content-Transfer-Encoding: %s\n"
        ,part2->getHeaderField("Content-Transfer-Encoding"));

    delete part2;

    printf("Finished.\n");


    }