(C++) Parse MIME to get Binary Data (such as GIF, JPG, or any binary file)

Demonstrates how to parse a MIME to get binary data. This example extracts the image data for a GIF image to an in-memory byte array, and also to a file.

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
zu/Oxta1rb17a6UhAK0hAPe9rb2Ec7V7a71rUpwpCL0xCJwhAOfOxta9tcatpdallM6cjMaUhK1C
IZwxELU5EK0xCLUxCN61pcacjK1rUrVaOaVKKZxCIZwxCKUxCL05CLUxAM6llO+1nMZzUr1rSrVS
KaVCGK1CGLVCEJQxCK05CLU5CIwpAKUxAK0xAM69tffWxrVrSrVaMbVKGMZKEL1CCLU5AP/v597O
xufGtcallNaljLWEa96ce9aUc717Wq1aMcZjMbVaKbVSIa1KGL1SGJw5CK1CCLVCCMZKCM5KCMZC
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MgonXyR5UAHWVBKIEmEcUJAIYxgSSSF94AZRPrgsQgUF0RmUgWpy/LFmRYdMkACAANwrWA8cbAhi
RZ8cjRWro0QEEsQVGTiKkLAM5QNGFWrAQFNLBIzABQPLRktQQAA7

--------------080707010302060306060800--

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#include <CkMime.h>
#include <CkByteData.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    // This example assumes 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 https://www.chilkatsoft.com/testData/sampleMime2.txt )

    bool success = mime.LoadMimeFile("sampleMime2.txt");
    if (success == false) {
        std::cout << mime.lastErrorText() << "\r\n";
        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 = mime.GetPart(1);

    CkByteData binaryData;

    // The GetBodyBinary method returns the binary bytes
    // of the part's body, automatically decoded from whatever
    // content-transfer-encoding might be used (such as base64).
    success = part2->GetBodyBinary(binaryData);

    // We now have the binary bytes of the GIF image in binaryData.
    // Save it to a file.
    CkFileAccess fac;
    success = fac.WriteEntireFile("out1.gif",binaryData);
    if (success != true) {
        std::cout << fac.lastErrorText() << "\r\n";
        return;
    }

    // An easier way to save the body content to a file,
    // assuming your application does not need to access
    // the binary data in-memory, is to call SaveBody
    success = part2->SaveBody("out2.gif");
    if (success == false) {
        std::cout << part2->lastErrorText() << "\r\n";
        return;
    }

    delete part2;

    std::cout << "Finished." << "\r\n";
    }