Unicode C++

Add a Related Item from a BinData Object

Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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Unicode C++

#include <CkEmailW.h>
#include <CkBinDataW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
    //  using the contents of a BinData object, and returns the generated Content-ID.

    CkEmailW email;
    email.put_Subject(L"Related image from BinData");

    //  Load the image data from a file into a BinData object.
    CkBinDataW bdImage;
    success = bdImage.LoadFile(L"qa_data/images/logo.png");
    if (success == false) {
        wprintf(L"%s\n",bdImage.lastErrorText());
        return;
    }

    //  Add the image as a related item; capture its generated Content-ID.
    const wchar_t *cid = email.addRelatedBd(L"logo.png",bdImage);
    if (email.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",email.lastErrorText());
        return;
    }

    //  Reference the related item in the HTML body by its Content-ID.
    CkStringBuilderW sbHtml;
    sbHtml.Append(L"<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
    int numReplaced = sbHtml.Replace(L"PLACEHOLDER_CID",cid);
    email.SetHtmlBody(sbHtml.getAsString());

    wprintf(L"NumRelatedItems = %d\n",email.get_NumRelatedItems());

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