Unicode C

MIME -- Convert Base64 to Binary

See more MIME Examples

Loads MIME containing a base64 body and converts it to binary. This changes the Content-Transfer-Encoding header to "binary", and the body is stored as raw unencoded bytes.

The MIME file initially loaded in this example contains:

Content-Disposition: attachment; filename="starfish20.jpg"
Content-Type: image/jpeg; name="starfish20.jpg"
Content-Transfer-Encoding: base64
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==

After converting, the binary MIME looks like the following. (Note: Loading it into a text editor and saving it will corrupt the binary data by dropping bytes. Non-text binary data CANNOT be handled as if it were text without corruption.)

Unicode C

#include <C_CkMimeW.h>
#include <C_CkByteData.h>
#include <C_CkFileAccessW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMimeW mime;
    const wchar_t *mimeStr;
    HCkByteData mimeBytes;
    HCkFileAccessW fac;

    success = FALSE;

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

    mime = CkMimeW_Create();

    success = CkMimeW_LoadMimeFile(mime,L"qa_data/mime/starfish20_base64.mim");
    if (success != TRUE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        return;
    }

    //  Show the MIME.  We can see the body is base64 encoded.
    mimeStr = CkMimeW_getMime(mime);
    wprintf(L"%s\n",mimeStr);

    //  Change the Content-Transfer-Encoding to "binary"
    CkMimeW_SetHeaderField(mime,L"Content-Transfer-Encoding",L"binary");

    //  Note: Now that the MIME's body is binary (JPG image data),
    //  we CANNOT get the MIME as a string.  We can only get it as bytes.

    mimeBytes = CkByteData_Create();
    success = CkMimeW_GetMimeBytes(mime,mimeBytes);

    //  We can save it to a file, and then examine it..
    fac = CkFileAccessW_Create();
    success = CkFileAccessW_WriteEntireFile(fac,L"qa_data/mime/starfish20_binary.mim",mimeBytes);
    if (success != TRUE) {
        wprintf(L"%s\n",CkFileAccessW_lastErrorText(fac));
    }
    else {
        wprintf(L"Saved binary MIME.\n");
    }



    CkMimeW_Dispose(mime);
    CkByteData_Dispose(mimeBytes);
    CkFileAccessW_Dispose(fac);

    }