(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";
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kMAQKljotJJGDZklS9PkyEHGLZu1ctbCmWvXThurfAbvHSii5kegxpYqtRpEKFnid/TSneu2LRYh
P/0Q1tJRgYOZV71UL5LEK1KiV68yVf+xgaOKmAZICd5bmA8FEyZQlMjRRAhQGQv4QQSJL8ZLFHwP
6aFIJXNIEkggcgQhwYIlKEFFGDKcEgBCBVCkByC0IAMJGnSAYsUNEmzAgw4HBJBeQisZcAswjqGh
wQeBKGIFFD0ocCJE9diyjTKRLPHBAx/cEAcdgxgx4Vg3HnSPKs4E00sNEYDwgQksQDLJIohMSJIj
ugSTCRA/ILFDCjTckUkrpYiCAEluYCMLJCsoMQUM9gjQRSSL7CLJJjmQxMw3kQChxA78IFULHIK0
MgonXyR5UAHWVBKIEmEcUJAIYxgSSSF94AZRPrgsQgUF0RmUgWpy/LFmRYdMkACAANwrWA8cbAhi
RZ8cjRWro0QEEsQVGTiKkLAM5QNGFWrAQFNLBIzABQPLRktQQAA7

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

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#include <C_CkMime.h>
#include <C_CkByteData.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    HCkMime mime;
    BOOL success;
    HCkMime part2;
    HCkByteData binaryData;
    HCkFileAccess fac;

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

    mime = CkMime_Create();

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

    success = CkMime_LoadMimeFile(mime,"sampleMime2.txt");
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        CkMime_Dispose(mime);
        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.
    part2 = CkMime_GetPart(mime,1);

    binaryData = CkByteData_Create();

    // 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 = CkMime_GetBodyBinary(part2,binaryData);

    // We now have the binary bytes of the GIF image in binaryData.
    // Save it to a file.
    fac = CkFileAccess_Create();
    success = CkFileAccess_WriteEntireFile(fac,"out1.gif",binaryData);
    if (success != TRUE) {
        printf("%s\n",CkFileAccess_lastErrorText(fac));
        CkMime_Dispose(mime);
        CkByteData_Dispose(binaryData);
        CkFileAccess_Dispose(fac);
        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 = CkMime_SaveBody(part2,"out2.gif");
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(part2));
        CkMime_Dispose(mime);
        CkByteData_Dispose(binaryData);
        CkFileAccess_Dispose(fac);
        return;
    }

    CkMime_Dispose(part2);

    printf("Finished.\n");


    CkMime_Dispose(mime);
    CkByteData_Dispose(binaryData);
    CkFileAccess_Dispose(fac);

    }