Get the Nth Binary Part of a Content-Type into BinData

See more Email Object Examples

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

Chilkat C Downloads

Download Chilkat for C

#include <C_CkEmail.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmail email;
    HCkBinData bdImage;
    HCkBinData bd;

    success = FALSE;

    //  Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
    //  MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
    //  the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
    //  excludeAttachments, and the BinData that receives the bytes.

    email = CkEmail_Create();
    CkEmail_putSubject(email,"GetNthBinaryPartOfTypeBd example");
    CkEmail_putBody(email,"See the attached image.");

    //  Load the image from a file into a BinData object and attach it (binary data belongs
    //  in a BinData, never in a string).
    bdImage = CkBinData_Create();
    success = CkBinData_LoadFile(bdImage,"qa_data/images/photo.png");
    if (success == FALSE) {
        printf("%s\n",CkBinData_lastErrorText(bdImage));
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdImage);
        return;
    }

    success = CkEmail_AddAttachmentBd(email,"photo.png",bdImage,"image/png");
    if (success == FALSE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdImage);
        return;
    }

    //  Load the bytes of the first (index 0) image/png part into a BinData object.
    bd = CkBinData_Create();
    success = CkEmail_GetNthBinaryPartOfTypeBd(email,0,"image/png",FALSE,FALSE,bd);
    if (success == FALSE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdImage);
        CkBinData_Dispose(bd);
        return;
    }

    printf("image/png part size (bytes) = %d\n",CkBinData_getNumBytes(bd));

    //  Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
    //  relative to the current working directory of the running application.


    CkEmail_Dispose(email);
    CkBinData_Dispose(bdImage);
    CkBinData_Dispose(bd);

    }